tech specs brick

8/6/2019 Tech Specs Brick

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Section V 1

SECTION V

TECHNICAL SPECIFICATION

BRICK WORK

a) SCOPE OF THE WORK:The work covered under this specification pertains to procurement of best quality

locally available stock bricks and workmanship in buildings walls of various thicknessesin strict compliance with the specifications and applicable drawings.

b) MATERIALS:Brick shall be best quality locally available stock bricks and samples shall be got

approved by the Engineer-in charge before incorporation in the work on large scale andmaintain the same for the entire work.

The nominal size of bricks (F.P.S) shall be 23 cm x11.5 cmx7.5 cm (9"x4.5”x2.75”). Permissible tolerance on dimensions shall be +/-3 mm in length & +/- 1.5 mm inwidth/thickness.

i. If the plastering to be done is more than the specified thickness to bring theplaster surface to perfect line, level and plumb with adjoining columns, beams, wallsetc., the contractor shall be responsible to provide and fix chicken wire mesh to receivemore thickness of plaster at his own cost and nothing extra will be paid on this account.

In case the size of bricks used in the work, found more than the permissible, thecontractor shall chip out the exposed edges of bricks up to the required level of wall toreceive specified thickness of plaster.

Bricks shall generally conform to IS 1077-1992. In any case minimum crushing

strength shall not be less than 35 Kg/cm² and water absorption shall not be more than15% by the weight. The Engineer-in-charge shall have the right to reject the bricksobtained from any field where the soils have an appreciable quantity of sulphate andchlorides. The specification for cement, sand and water shall be same as describedherein before under cement concrete. Bricks shall be thoroughly soaked in waterbefore using till the bubbles cease to come up. No half or quarter brick shall be usedexcept as closer. The closers shall be cut to required size and used near the end of thewalls. The walls shall be raised truly to plumb. The type of bond to be adopted shall beEnglish bond, but vertical joints shall be laid staggered.

c) WORKMANSHIP: Four courses of brickwork with four joints should not exceed by more than 40

mm. the same bricks piled one over the other without mortar.Brickwork shall not be raised more than 10 courses a day unless otherwise approved bythe Engineer-in-charge. The brickwork shall be kept wet for at least 10 days. Brickworkshall be uniformly raised around and no part shall be raised more than 1.0 meter aboveanother at any time.



Section V 2

All joints shall be thoroughly flushed with mortar of mix as specified in theschedule of quantities, at every course. Care shall be taken to see that the bricks arebedded effectively and all joints completely filled to full depth.

The joints of brickwork to be plastered shall be raked out to a depth not less than10 mm, as the work proceeds. The surface of brickwork shall be cleaned down andwatered properly before the mortar sets.

The adhesion between the brick masonry surface and the concrete surface ofcolumns, beams, chajjas, lintels etc. should be proper by ensuring that the concretesurface coming in contact with brick masonry is hacked/ chipped/ keyed, cleaned andcement slurry is applied so that proper bond is achieved between the two dissimilarmaterials. It is the responsibility of the contractors to ensure that there will not be anycracks/ fissures anywhere in the brick masonry.

All the courses shall be laid truly horizontal and all vertical joints shall be trulyvertical. Specified mortar of good and approved quality shall be used. Lime shall not beused where reinforcement is provided in brickwork. The mortar should completely coverthe bed and sides of the bricks. Proper care should be taken to obtain uniform mortar

joint throughout the construction, the walls should be raised uniformly in proper,approved bond .In construction of the wall, first of all two end corners are carefully laidto line and level and then in between portion is built, with a cord stretching along theheaders or stretchers held in position at the ends. This helps in keeping the alignmentor the courses and maintaining them in level. Similarly all other courses are built. Careshall be taken to keep the prepends properly aligned within following maximumpermissible tolerances:

1. Deviation from vertical within a storey shall not exceed 6 mm per 3 m height.2. Deviation in verticality in total height of any wall of building more than one storey

in height shall not exceed 12.5 mm.3. Deviation from position shown on plan of any brickwork shall not exceed

12.5mm.4. Relative displacement between load-bearing walls in adjacent storey

intended to be vertical alignments shall not exceed 6 mm.

No brickwork shall be carried on during frosty weather except with the writtenpermission of the Engineer-in-charge that will give special directions as to the manner inwhich the work is to be performed. All brickwork laid during the day, shall, in seasonsliable to frost, be properly covered up at night as directed by the engineer-in-charge.Should any brickwork be damaged by frost, the brickwork shall at the discretion of theEngineer-in-charge, be pulled down and made good at the cost of the contractor.

Concrete surfaces of columns, beams, lintels; chajjas etc. coming in contact withmasonry work shall be properly chipped, washed and given a thick coat of cement slurrybefore start of work. The rate quoted shall include wire brushing and cleaning brickworkcovered with fungus or deleterious materials. Brickwork shall be well watered/curedthroughout the day for least a week from the date of building and the work shall beprotected from sun and rain.Materials and workmanship for a half brick or brick on edge partition wall shall be asspecified above.



Section V 3

d) The rates for brickwork shall include the cost of the following :

1. Providing and fixing necessary single or double scaffolding and removing thesame after the works are completed.

2. Watering, curing, and lifting of materials to any height.3. Raking out of joints to receive plaster.4. Forming slab sittings, cutting or leaving holes for lugs of windows, doors, sills ,

switch boxes etc:,5. Making good all holes, chases etc., to any depth due to conduit pipes,

holdfasts, bolts, switch and plug boxes etc;6. Bedding and pointing pre-cast lintels, sills etc. in or on walls.

For the purpose of measurements, the thickness of one brick wall and over shallbe taken in terms of multiples of half brick.

e) MODE OF MEASUREMENT:

(i) For brickwork measured in cubic meters: The contractor rate shall be for a unit of one cubic meter of brick masonry as

actually done 230 mm. thick (or as specified in schedule) brick walls shall be taken asone brick thick.

All openings in brickwork for doors, windows and ventilators shall be deducted toget the net quantity of actual brickwork done.

Openings or chases required for Public Health or electrical inserts less than 0.1sqmt and bearing of precast concrete members shall not be deducted. No extrapayment shall be made for any extra work involved in making the above openings orplacements.

(ii) For brickwork measured in square meter:

Half brick thick masonry walls shall be measured in sqmt. All openings inbrickwork for doors and windows and ventilators shall be deducted to get the netquantity of actual work done. Opening or chases required for Public Health or Electricinserts less than 0.1sqmt and bearing of pre cast concrete members shall not bededucted. No extra payments shall be made for extra work involved in making theabove openings or placements.

******

REINFORCED CEMENT CONCRETE

a) SCOPE OF WORK:

This specification covers the proportioning, mixing and placing of plain,reinforced, in-situ and pre-cast cement concrete.

b) MATERIALS:

Except as otherwise called for in this specification all materials for concrete shallcomply with the latest Indian Standard Specifications.



Section V 4

c) CEMENT: The cement shall comply with the requirements of I.S.8112 – latest revisions.

Only one brand of cement shall be used for exposed concrete in any individualstructure. Cement shall be delivered to site in unbroken bags sewn by themanufacturer. Cement reclaimed from cleaning bags or leaking containers shall not beused, cement shall be used in the sequence of receipt of shipment unless otherwisedirected. The contractor, shall, when required by the Engineer, furnishedmanufacturer’s test certificate for the cement.

d) STORAGE: The contractor shall make necessary arrangements to the satisfaction of the Engineer

for the storage of cement.

e) AGGREGATE: The fine and coarse aggregate shall comply with I.S. 383 latest revisions. The

aggregate shall be stored at site in such a manner that inter mixing of materials isseparate stock piles is not possible and to prevent contamination of the stock piles from

the ground or rubbish or wind blown dust.To get effective control on quality, materials which do not conform to I.S.

specifications shall not be brought to site of work. Washing, grading, etc. of aggregateshall be done away from the job site. Storage piles of aggregate shall have gooddrainage, preclude inclusion of foreign matter, and preserve the gradation. Sufficientlive storage shall be maintained to permit segregation of successive shipments,placement of concrete at required rate such procedure as inspection and testing.

f). SAND: The sand to be used shall be obtained from a source approved by the Engineer-

in-charge. Sand shall be natural sand, crushed gravel or crushed stone. It shall be well

graded, course in texture, clean gritty to the touch, hard, strong, durable and free fromsalt, mica, clay earth, coal, any animal vegetable and bituminous matter, any solublesulphate, gypsum and any other harmful material. Use of sea sand is prohibited.Unless initially clean, all sand shall be thoroughly and carefully cleaned by screeningand washing in fresh and clean water to remove all objectionable foreign matter to meetthe specifications and standards.

Sand/fine aggregate shall conform to the grading specified in ‘fine aggregatesZone ‘I’ in IS code No. 383 latest revision.

I.S. SieveDesignation

Percentage passing by weightNatural sand

10.00 mm 100

4.75 mm 90-100

2.36 mm 60-95

1.18 mm 30-70



Section V 5

I.S. SieveDesignation

Percentage passing by weightNatural sand

600 Micron 15-34

300 Micron 5-20

150 Micron 0-10

g) COARSE AGGREGATE:

Coarse aggregate shall consist of hard, strong durable particles of crushed stoneand shall be free from thin elongated soft pieces, vegetable matter or other deleteriousmatter. It shall have no adherent coating.

The aggregate shall be graded from fine to coarse in accordance with I.S. codewhich is reproduced below:

GRADING

Percentage Passing For Graded Aggregate of Nominal Size byWeightIS Sieve

Designation40 20 16 12.5

80 mm 100 - - -63mm - - - -40 mm 95 – 100 100 - -20 mm 30 – 70 95 – 100 100 10016 mm - - 90 -100 -12.5 mm - - - 90 – 10010mm 10-35 25-55 30-70 40-854.75 mm 0 – 5 0 – 10 0 – 10 0 – 10

The testing and maximum size of aggregate shall be in accordance with the I.S.383 or as specified under the Schedule of Quantities.

h) WATER:

The water quality shall conform the requirement of IS: 456:2000 and also cleanand free from deleterious matter, such as oils, acids, alkalis, sugar and vegetablematter. Every attempt shall be made to use water that is fit for drinking and whereverpossible water shall be used direct from the supply mains. Water stored forconstruction shall be kept clean at all times, and adequate storage to last for 24 hours atleast shall be arranged at site by the contractor. The PH value of the water shallgenerally not less than 6.

i) ADMIXTURES:

Admixtures shall be used in concrete only with the approval of the Engineer.Admixtures shall be supplied by the contractor and also mixed in the concrete withoutextra cost. The cost of admixture is included in the rate of contractor.



Section V 6

j) CLASSES OF CONCRETE:

Unless otherwise specifically stated as “Ordinary Concrete”, all concreteproposed under this specification shall be taken to mean Controlled concrete. For mixdesign, IS: 10262 shall be referred and also satisfies the requirement of IS: 456:2000.

k) Controlled concreteControlled concrete means that the mix proportions are determined by

preliminary mix designs and laboratory tests. These shall be carried out at intervals ofchange in source of aggregates, cement, water and also whenever the Engineer hasreasons to believe that there has been a change in the quality/properties/grading etc.of any of the constituents of concrete, which in his opinion would impair its strengthand/or durability. A prefix and two numbers shall identify each class of concrete. Prefix‘M’ would denote Normal concrete). The two numbers e.g. 30/20 would denote thecrushing strength of concrete cubes (characteristic strength) at 28 days age inN/mm 2and maximum size of coarse aggregate in mm respectively.

The characteristic compressive strengths on 15 cm cubes at 28 days for all thetypes of concrete as mentioned above shall be same as given in tables for respectivetypes of concrete.

l) Characteristic Strength

Class Characteristic Compressivestrength on 15 cm cubes at28 days in N/Sq. mm

Maximum aggregatesize in mm

N15/20 15 20N20/20 20 20N25/20 25 20N30/10 30 10N30/20 30 20

Note: Compressive strength tests with the approval of the Engineer shall be conducted

on 15 cm. diameter and 30cm high cylinders in accordance with IS: 516 instead of oncubes. Where cylinder strength figures are adopted, the compressive strength figuresgiven in respective tables below for every grade of concrete shall be modifiedaccording to the formula.

Minimum cylinder compressive = 0.8 times compressive

Strength required strength specified for 15 cm.Cubes. The controlled concretedesignation shall be of the followingrequirements.

When requirement arises for other grades of concrete such as N32.5, N37.5,N42.5 etc. and varying maximum size of aggregate to 12.5 mm, the same shall beaccommodated with the approval of the Engineer.

Normal concrete shall have a net unit weight of not less than 2450 kilograms percubic meter.



Section V 7

m) MINIMUM CEMENT CONTENTSFor any particular mix, minimum cement content mix and water cement ratio shall

be selected so that strength, workability and durability requirements are met forspecified work. Reference shall be made to Table 5 and 6 of IS- 456: 2000 unlessspecified otherwise.

n) TRIAL CONCRETE MIXES The proportions of cement, fine aggregate, coarse aggregate, additives and

water necessary to produce a concrete mix which will fulfill the requirements of thisspecification for each grade of concrete shall be determined on the basis of trial mixesconducted with the samples of the material as used in the work site in presence of theEngineer in field laboratory by the Contractor.

o) MIX DESIGN OF CONCRETEThe Contractor shall carry out mix design of concrete for various grades such as

M 20, M 25, M30, M45 etc. using different sizes of aggregates as directed by theEngineer to produce concrete of the required strength, workability, durability and otherproperties. Concrete shall be proportioned to obtain workable mixes for the purposeintended and to adequately meet the strength and finish requirements. Primary mixdesign shall be established through several trial studies by the contractor well inadvance so as to meet the time schedule of the work. During mix design/trial studies,contractor shall use the ingredients, which are qualified / approved for actual work atwork site.

p) Proportioning for Maximum DensitySuitable proportions of sand and the several sizes of coarse aggregates for each

class of concrete shall be selected to give as nearly as practicable, the maximumdensity. This is to be determined by mathematical means, laboratory tests, field trials orother means. If necessary, the gradation of the aggregates shall be corrected bychanges in the aggregate plant and the processing methods so that maximum density

and good workable concrete can be produced to comply with the requirements of the jobs.

q) Proportioning by W/C RatioOnce a mix, including its water cement (W/C) ratio has been determined and

specified after trial studies & approved by the Engineer, that W/C ratio shall bemaintained. The Contractor shall determine the water content of the aggregatefrequently as the work progresses and the amount of mixing water entering the mixershall be changed to compensate for the water content in aggregates so as to maintainspecified W/C maintained at all the time.

r) W/C Ratio Values

The actual W/C ratio to be adopted shall be determined in each instance by theContractor, so as to have workable mix without affecting the specified/requiredproperties of concrete in its fresh and hardened state. Permissible tolerance in w/c ratioshall be maintained to + 0.02 of the specified value. In case of any change in any of theproperties, mix design shall be redone and tested for its specified properties.



Section V 8

s) Consistency and SlumpThe concrete shall have a consistency such that it will be workable in the

required position. It shall be of such consistency that when properly vibrated, will flowaround reinforcing steel, and all embedded parts. The slump for concrete asdetermined by slump tests as per IS 1199 shall not exceed the maximum slumpsindicated below for each type of construction unless otherwise approved or directed bythe Engineer. Whenever concrete is needed to be pumped, slump shall be varied withthe approval of the Engineer. In such events, contractor shall carry out fresh trialstudies to establish the desired properties.

Sl.No Workability Slump in mm

Min. Max. Type of Construction

1 Selflevelling 150 200 Raft where reinforcement layout

is congested.

2 Low 25 75 Plain footings, caissons, sub-structurewalls etc.

3 Medium 50 100 Reinforced beams, columns, walls,etc.

4 Medium 40 80 Reinforced foundation, walland footings.5 Low 25 75 Pavements, mass concrete

6 High 100 150 Trench fill, In situ piling and Tremieconcrete

The Contractor shall not place concrete having a slump outside the limitsspecified without the approval of the Engineer. The slump results shall not differ by +25mm or + 1/3 of the required value whichever is less.

Slump tests shall be conducted immediately in the first mix of every grade ofconcrete and necessary correction shall be made. In addition the same test shall becarried out during the following circumstances:

(a) At least one test in each grade per shift.(b) At the time of casting the cubes for compressive strength.(c) At least one test for every 50 cu. m concrete or part thereof(d) Whenever the visual inspection demands(e) More frequently, if there is distinct change in job condition(f) If required by the engineer at least one test per air content test

t) Acceptance Criteria Acceptance criteria shall be as per IS 456-2000.

u) Failure to meet Strength RequirementIn the event that concrete tested fails to meet the specification, the Engineer shall havethe right to insist on any one or all of the following and the contractor at his ownexpense shall carry out all such measures as directed by the Engineer.

1) Changes in the concrete mix proportions for all the balance work.

2) Core-cutting and testing of the concrete represented by the tests that failed asper IS: 456

3) Extended curing of the concrete represented by the specimen.4) Load tests on part of structures as per IS: 456



Section V 9

5) Replacement of any such portions of the structure.6) Suitable NDT of such concrete which indicates a low strength.

If the result of the test(s) is not satisfactory, the Engineer shall instruct that thepart of the works concerned shall be dismantled or cut out and reconstructed to complywith this specification, or that other measures shall be taken to make the works secureat contractor's cost.

Concrete during transport and placement shall be ensured during rains also. Ifthere is any sign of washing of cement and sand, the concrete shall be entirely removedimmediately.

The methods of delivering and handling the concrete shall be such as to facilitateplacing with minimum of re-handling and without damage to the structure or theconcrete.

v) CONCRETE QUALITY:In proportioning the concrete of various grades the quality of cement shall be

determined by weight. The quantities of fine and coarse aggregates will be either by“batched and mixed in approved weigh batching system” or by equivalent volumebatching.

Where ordinary concrete with nominal mixes are specified batching of materialsmay be done by volume. Due allowance is to be made for building of fine aggregateaccording to I.S. 456 latest edition. Ordinary Portland cement shall be taken to weigh1442 kg. Per Cu.m.

w) CUBE TEST: Samples of concrete shall be taken as often as considered necessary by the

Engineer and work tests carried out in accordance with the procedure laid down in I.S.

code of practice (I.S. 516). Samples shall be taken from each 50 cu.m. of concretemade during the progress of the work, or when a days concrete work does not amountto 50 cu.m from each day’s pour. Six cubes 150 mm x 150 mm x 150 mm shall bemade tested after 7 days, and the remaining three after 28 days. 90 percent of the testsamples shall show strength higher than the prescribed strength. The average of thestrength of the three specimens taken at a time may be assumed as the differencebetween the maximum and the minimum strengths of the three specimens does notexceed 15 percent of the average strength of concrete with 7 days age will not be lessthan 2/3 rd of the concrete cubes shall be furnished by the Department. All the materialsand labour for making necessary tests will be at the cost of the contractor. The resultsof the test conducted by the Department or arranged by the Department in any of therecognized laboratories shall be taken final and binding on the contractor. In case thecompressive strength obtained from the test samples of concrete is less than theminimum specified strength the work is liable to be rejected.

The contractor shall submit his proposed design mixes for the approval of theEngineer. Once approved he has to strictly adhere to the same. In case of change inthe materials he will have to submit fresh design for the mixes for the approval of theEngineer. If in actual practice, the strengths obtained are less than the specified onethe work will be rejected. If, however, the strengths are higher than the specified onesdue to excellent control or otherwise, the Contractor will have no claim for extrapayment.



Section V 10

y) MixersMixers may be stationary mixers of either the tilting or non-tilting type of

approved design.

z) MaintenanceThe mixers shall be maintained in satisfactory operating condition, and mixer

drums shall be kept free of hardened concrete. Mixer blades shall be replaced whenworn down more than 10 percent of their depth. Should any mixer at any time produceunsatisfactory results, leak mortar or cause waste of materials, its use shall be promptlydiscontinued until it is repaired.

Stationary Mixers Mixers, which have a rated capacity not exceeding 200 litres of mixed concrete,

may be tilting type. Mixers, that have a rated capacity of 200 liters or more of mixedconcrete, shall be non-tilting types. Mixers shall not be charged in excess of thecapacity recommended by the manufacturer. Mixers shall be capable of combining thematerials into a uniform mixture and of discharging this mixture without segregation.The mixers of mixing plant shall include a device for counting the total number ofbatches of concrete mixed. The mixers shall be operated at the drum speed designatedby the manufacturer on the nameplates.

Mixing time The mixing periods specified herein are to ensure proper quality control. The

mixing time will be increased when such increase is necessary to secure the requireduniformity and consistency. Excessive over mixing requiring addition of water will not bepermitted. Mixing time shall be in accordance with the recommendation of the batchingplant manufacturer.

Provision of inspection The complete plant assembly shall include provisions to facilitate the inspection

of all operations at all times.

Maintenance of records All records and charts of the batching and mixing operations shall be prepared

as specified herein and promptly handed over to the Engineer.

Sampling facilities Suitable facilities shall be provided for readily obtaining representative samples

of aggregate from each of the batchers, and suitable devices for obtainingrepresentative samples of concrete for slump tests, unit weight, air content anduniformity tests shall be made by the Engineer. All necessary platforms, tools andequipment for obtaining samples shall be furnished at the start of work.

Concrete specimen:Concrete specimen shall be prepared from the mixes used in the work and testedto determine the adequacy and accuracy of control for the materials entering into theconcrete mix. The Contractor shall perform preparation, storage and testing of thespecimen in presence of the Engineer to his entire satisfaction.



Section V 11

TRANSPORT AND PLACING:

No concreting work shall be started until the surface on which it is to bedeposited shall be checked and approved by the Engineer. Concrete shall betransported from the mixer to the place of final deposit as rapidly as practicable, and bymethods, which will prevent segregation or loss of ingredients. Equipment for chuting,pumping and pneumatically conveying concrete shall be of such size and design as toensure a practically continuous flow of concrete at the delivery and without anyseparation of the materials. The chute shall be of metal lined wood, with slope not lessthan 1 vertical to 3 horizontal and not more than 1 vertical to 2 horizontal. Thedischarge end of the chute shall be provided with a baffle plate to prevent segregation.

Concrete shall be deposited as nearly as practicable in its final position withoutsegregation due to rehandling or flowing. The Concreting shall be on at such a rate thatthe concrete is at all times plastic and flows slowly into the space between the bars. Noconcrete that has partially hardened or been contaminated by foreign materials shall bedeposited on the work, nor shall retempered concrete be used.

Then concrete is once started, it shall be carried on as a continuous operationuntil the placing of the panel or section is completed.

The top surface shall generally be made level as far as practicable. In foundationtrenches or such other situation, it shall be carefully deposited and not thrown from aheight. If transported to the work in barrows, the barrow may be tipped from a height ofnot more than one metre above the bottom of the layer being deposited. If the heightexceeds one metre the concrete must be tipped on to an inclined plane or spout. Watershall be removed from excavation before concrete is deposited. No flow of water shallbe diverted through over freshly deposited concrete. Dewatering shall be done till theconcrete is sufficiently hardened. The rate for concrete shall include the cost of suchdewatering operations.

Before fresh concrete is deposited upon or against concrete, which has alreadyhardened, the surface of the hardened concrete shall be well roughened. If necessaryby chipping, and all laitance removed and the surface shall then be swept clean withwire brushes, thoroughly wetted, covered with the thin layer of mortar composed ofequal volumes of cement and sand. An excess of cement shall be provided in theconcrete in contact with the old work. The rate for concrete shall be inclusive of varioussurface preparations, as detailed above and no extra claim would be admitted on thisaccount. Concrete footings shall be placed upon undisturbed clean and hard surface ofspecified bearing capacity.

COMPACTION :

The concrete shall be fully compacted through out the full extent of the later. Itshall be thoroughly worked against formwork and around any reinforcement and otherembedded items without displacing them. Successive layers of the same lift shall bethoroughly worked together. Each layer shall be compacted by mechanical internalvibrating equipment supplemented by hand spading, rodding and tamping as directed.Vibrators shall in no case be used to transport, concrete inside forms. Use of formvibrators will not be permitted. Duration of vibration shall limited to time necessary toproduce satisfactory consolidation without causing objectionable segregation. Thevibrator shall not be inserted into lower coursed that have begun to set. Concrete shallbe poured’ in lifts to avoid formation of voids around embedded items. The contractor



Section V 12

shall' have at least 4 immersion type vibrators of varying needle sizes with frequenciesnot less than 7000 RPH for R.C.C. work. In addition to above, sufficient numbers ofpetrol vibrators shall be kept available at site at all times in good condition.

Finishing of Concrete:

Slight honey comb and minor effects shall be patched after chisellingout loosematerial with cement mortar of one part cement to two parts fine aggregates withapproval Engineer. The patches will be square/rectangular and will be properly finishedto match. No separate rate will be of payable for carrying out any repair or for finishing .

Grouting :

Grout for anchor bolts, sleeves and other items shall be composed of equalparts of sand and Portland cement, with sufficient water to produce requiredconsistency.

Curing and protection :

Curing of concrete shall start after 8 hours of placement and in hot weather within fourhours of placement. All cement concrete after laying, shall be covered with a layer ofsacking, canvas, Hessian or similar absorbent material and kept for continuously notless than fortnight. In case of Portland Pozzolano cement, the curing is required to becontinued for 21 days from the date of concreting. For curing of concreting pavements,sidewalls, floors, flat roofs or other level surfaces the ponding method curing ispreferred. All water used both in the preparation and final wetting is to be cleaned, freefrom sediment of any kind and generally fit for drinking. The work shall be protectedfrom drying winds and direct sun rays.

MEASUREMENT AND PAYMENT.

a) Actual volume of work shall be measured in Cu.m unless otherwise specified inthe schedule of quantity. Deductions, pipes, ducts, etc., shall be made but nodeductions shall be made for opening up to 0.1 Sq.m in area each (for theopening up to 0.1 Sq.m in area each, shuttering shall not be paid for separately).No additions and deduction shall be made for embedded fixtures.

b) Pre-cast concrete shall be measured the same way as specified above unlessother wise stated. No separate payment shall be made for form work, shuttering,curing, handling, placing in position and jointing wherever required as perspecification and schedule of quantity.

c) No deduction shall be made for volume occupied by reinforcement. Volume

occupied by drainage water pipes, conduits, etc., not exceeding 100 Sq.cm eachin cross sectional area shall not be deducted.

d) Treatment of bearing with cement plaster shall not be measured.

e) Drip mould, grooves, chamfers shall not be measured.

f) Concrete perforated units shall be measured on gross area of units. No separatepayments shall be made for fixtures.



Section V 13

g) Unless otherwise specified in the schedule of quantity nothing extra shall beadmissible for lying at an angle, any particular shape of the section cantileveredpart or any projections or portions sunk.

h) Unless otherwise specified no separate payments shall be paid for placing atvarious lifts.

*****

PLAIN CEMENT CONCRETE FOR GENERAL WORK:

For plain cement concrete work, the specification for materials viz, cement, sand, fineand coarse aggregates and water shall be the same as that specified in reinforcedconcrete work specifications.

But the proportion of mix will be nominal and the ratio of fine and coarse aggregate maybe slightly adjusted within limits, keeping the total value of aggregates to a givenvolumes of cement constant to suit the sieve analysis of both the aggregates. Cementshall on no account by measured by volume, but it shall always be used directly fromthe bags (i.e. 50 kg/bag).

The proportion of cement, sand, aggregate and water for cement of proportion 1:5:10,1:4:8, 1:3:6 & 1:2:4 by volume shall generally consist of quantities as given below:

Quantity of materials used per bag of cement

Proportion ofIngredients

Cement Fine aggregate(sand)

Coarseaggregate

Total of fine andcoarse

aggregates

Water

1:5:10 1 170 ltrs. 340 ltrs. 800 kgs. 60 ltrs.1:4:8 1 130 ltrs. 272 ltrs. 625 kgs. 45 ltrs.1:3:6 1 102 ltrs. 204 ltrs. 480 kgs. 34 ltrs.1:2:4 1 68 ltrs. 136 ltrs. 350 kgs. 32 ltrs.

*******



Section V 14

FORM WORK:

The form work shall consist of shores, bracings, sides of beams and columns,bottom of slabs etc, including ties, anchors, hangers, inserts etc. complete which shallbe properly designed and planned for the work. The formwork shall be so erected andfixed that up and down vertical adjustment can be made smoothly.

The formwork shall be so constructed that it is rigid enough to remain free fromany bulging, sagging or any movement during the placing of the Concrete and that itcan be subsequently removed without damaging concrete. The formwork shall besufficiently watertight to prevent loss of liquid from the concrete. All form works shall befixed to proper elevation. The contractor shall undertake no concreting work until thelevel, size, suitability etc, is approved by the Engineer. Unless otherwise specified allforms in contact, with concrete should be steel forms of required thickness. Surface offorms in contact with concrete shall be properly planned. All rubbish shall be removedfrom the interior of the forms and the 'surface of formwork to come in contact withconcrete shall be cleaned and thoroughly treated with oil. The oil shall be applied beforethe reinforcement is placed, and care shall be taken so that no oil comes in contact with

steel while it is being placed in position. The joints of forms shall be made watertight byplugging them with good clay jute or by other approved means before applying oil. Theforms shall be so fixed that only slight marks are visible on the surface of the concreteafter stripping the forms. Steel forms shall be with prior approval of the Engineer.Approved form emulsions shall be used for application to the form surfaces in such away as to prevent discoloration of the original cement colour. Steel formwork used shallbe free from bulges, and shall be plane and unbent. Plates shall be closely and properly

jointed. No plugs, bolts, ties or any appliances whatsoever for supporting the shutteringshall be fixed permanently in the structure not be placed temporarily in such a mannerthe damage to the structure would result from their removal at the time of striking theforms and supports. Forms for beams should be laid with a camber of 1/480th of theSpan.

a) DESIGN OF FORM WORK:The design and engineering of formwork as well as its construction shall be the

responsibility of Contractor and as per IS 14687 - latest revision. If so instructed, thedrawings and calculations for the design of the form work shall be submitted well inadvance to the Engineer-in-Charge for approval before proceeding with work, at noextra cost to the Department. Engineer-in-Charges approval shall not however, relieveContractor of the full responsibility for the design and construction of the formwork. Thedesign shall take into account all the loads vertical as well as lateral that the forms willbe carrying including live and vibration loadings. Steel props shall only be used forscaffolding purposes.

b) TOLERANCE:Tolerance is a specified permissible variation from lines, grade or dimensionsgiven in drawings. No tolerances specified for horizontal or vertical building lines orfootings shall be constructed to permit encroachment beyond the legal boundaries.Unless otherwise specified the following tolerances will be permitted.



Section V 15

c) TOLERANCE FOR RC BUILDING:

(i) Variation from the plumb

a. In the line and surfaces of columns, piers,walls and in buttresses

5mm per 2.5mts, but not morethan 25mm

b. For exposed corner columns and otherconspicuous lines

b.1 In any bay or 5mts maximum (+/-) 5mmb.2 In 10mts ore more (+/-) 10mm(ii) Variation from the level or from the grades indicated on the drawingsa. In slab soffits, ceilings, beam soffits and

in arisesa.1 In 2.50mts (+/-) 5mma.2 In any bay or 5mts maximum (+/-) 8mma.3 In 10mts or more (+/-) 15mmb. For exposed lintels, sills, parapets,

horizontal grooves and other conspicuouslines

b.1 In any bay or 5mts maximum (+/-) 5mmb.2 In 10mts ore more (+/-) 10mm(iii) Variation from the level or from the grades indicated on the drawingsa.1 In any bay or 5mts maximum (+/-) 10mma.2 In 10mts or more (+/-) 20mm(iv) Variations in the sizes and locations of

sleeves, openings in walls and floorsexcept in the case of and for anchor bolts.

(+/-) 5mm

(v) Variations in cross-sectional dimension ofcolumns and beams in the thickness of

slabs and walls.

(+) 10mm/(-) 5mm

(vi) Footingsa. Variation in dimensions in plan (+) 50mm/(-) 5mmb. Misplacement or eccentricity 2% of footing within the direction

of misplacement but not morethan 50mm.

c. Reduction in thickness (-)5% of specified thicknesssubject to maximum of 50mm

(vii) Variation in stepsa. In a flight of stairs

a.1 Riser (+/-) 3mma.2 Tread (+/-) 5mmb. Consecutive steps

b.1 Riser (+/-) 1.5mmb.2 Tread (+/-) 3mm

Tolerances in other concrete structureA All structure

a.1 Variation of the constructed linear outlinefrom established position in plan

a.1.1 In 5mts (+/-) 10mm



Section V 16

a.1.2 In 10mts or more (+/-) 15mmb.1 Variation of dimension to individual structure features from established

positions in planb.1.1 In 20mts or more (+/-) 25mmb.1.2 In buried constructions (+/-) 150mmc.1 Variation form plumb from specified batter

or from curved surfaces of all structures.c.1.1 In 2.5mts (+/-) 10mmc.1.2 In 5.0mts (+/-) 15mmc.1.3 In 10.0mts or more (+/-) 25mmc.1.4 In buried constructions (+/-) Twice the above limits.d.1 Variation from level or grade

indicated on drawings in slabs, beams,soffits, horizontal grooves and visiblearises

d.1.1 In 2.5mts (+/-) 5mmd.1.2 In 7.5mts or more (+/-) 10mm

d.1.3 In buried constructions (+/-) Twice the above limits.E Variation in cross-sectionaldimensions of columns, beams,buttresses, piers and similar members.

(+) 10mm/(-) 5mm

F Variation in the thickness of slabs, walls,arch sections and similar members.

(+) 10mm/(-) 5mm

Water Proof Plywood shall be used for exposed concrete surfaces; where calledfor Sawn and wrought timber may be used for unexposed surfaces. Inside faces offorms for concrete surfaces, which are to be rubbed finished, shall be planed to removeirregularities or unevenness in the face. Formwork with lining will be permitted.

All new and used from lumber shall be maintained in a good condition withrespect to shape, strength, rigidity, water tightness, smoothness and cleanliness ofsurfaces. Form lumber unsatisfactory in any respect shall not be used and if rejected byEngineer-in-Charge shall be removed from the site. Shores supporting successivestories shall be placed directly over those below or be so designed and placed that theload will be transmitted directly to them. Trussed supports shall be provided for shoresthat cannot be secured on adequate foundation.

Formwork during any stage of construction showing signs of distortion ordistorted to such a degree that the intended concrete work will not conform to the exactcontours indicated on the drawings, shall be repositioned and strengthened. Pouredconcrete affected by the faulty formwork, shall be entirely removed and the formworkcorrected prior to placing new concrete.

Excessive construction camber to compensate for shrinkage settlement etc. thatmay impair the structural strength or members will not be permitted.

Forms for substructure concrete may be omitted when, in the opinion ofEngineer-in-charge, the open excavation is firm enough to act as the form. Suchexcavations shall be slightly larger than required by the drawings to irregularities forirregularities in excavation and to ensure the design requirement.



Section V 17

B Footings for columns, piers, walls, buttresses and similarmembers:

A Variation in dimensions in plan (+) 50mm/(-) 10mm

BMisplacement or eccentricity 2% of footing within the direction

of misplacement but not morethan 50mm.

CReduction in thickness (-)5% of specified thickness

subject to maximum of 50mm

d) FORMWORK REQUIREMENTS:Forms shall conform to the shapes, lines, grades and dimensions including

camber of the concrete as called for in the drawings. Ample studs, washer braces,straps, shores etc. shall be used to hold the forms in proper position without anydistortion whatsoever until the concrete has set sufficiently to permit removal of forms.Forms shall be strong enough to permit the use of immersion vibrators in special cases;form vibrators may also be used. The shuttering shall be close boarded. Timber shall bewall seasoned, free from sap, shakes, loose knots, worm holes, warps or other’ surfacedefects in contact with concrete. Faces coming in contact with concrete shall be freefrom adhering grout, plaster, paint, projecting nails, splits or other defects. Joints shallbe sufficiently tight to prevent loss of water and fine material from concrete.

Forms shall be so designed and constructed that they can be stripped in theorder required and their removals do not damage the concrete. Face formwork shallprovide true vertical and horizontal joints, conforming to the architectural features of thestructure as to location of joints and be as directed by Engineer-in-Charge.

Where exposed smooth or rubbed concrete finishes are required, the forms shallbe constructed with special care so that the desired concrete surfaces could beobtained which require a minimum finish.

e) BRACINGS, STRUTS AND PROPS:Shuttering shall be braced, strutted, propped and so supported that it shall not

deform under weight and pressure of the concrete and also due to the movement ofmen and other materials. Bamboos shall not be used as props or cross bracings.

The shuttering for beams and slabs shall be so erected that the shuttering on thesides of beams and under the soffits of slab can be removed without disturbing thebeam bottoms.

Re-propping of beams shall not be done except when props have to bereinstated to take care of construction loads anticipated being in excess of the designload. Vertical props shall be supported on wedges or other measures shall be takenwhereby the props can be gently lowered vertically while striking the shuttering.

If the shuttering for a column is erected for the full height of the column, one sideshall be left open and built upon sections as placing of concrete proceeds, or windowsmay be left for pouring concrete from the sides to limit the drop of concrete to 1mts oras directed by Engineer-in-Charge.



Section V 18

f) INSPECTION OF FORMWORK:Following points shall be borne in mind while checking during erection of

formwork and got approved by the Engineer-in-Charge before placing of reinforcementbars:

a) Any member which is to remain in position' after the general dismantling is done,should be clearly marked.

b) Material used should be checked to ensure that, wrong items I rejects are notused.

c) If there is any excavation nearby which may influence the safety of form works,corrective and strengthening action must be taken.

d) i). The bearing soil must be sound and well prepared and the sole platesshall bear well on the ground.

ii) Sole plates shall be properly seated on its bearing pads or Sleepers.

iii)The bearing plates of steel props shall not be distorted.iv) The steel parts on the bearing members shall have adequate bearing areas.

e) Safety measures to prevent impact of traffic; scour due to water etc. should betaken. Adequate precautionary measures shall be taken to prevent accidentalimpacts etc.

f) Bracing, struts and ties shall be installed along with the progress of form Work toassure strength and stability of formwork at intermediate Stage. Steel sections(especially deep sections) shall be adequately retained against tilting, over turningand formwork should be restrained against horizontal loads. All the securing

devices and bracing shall be tightened.g) The stacked materials shall be placed as catered for, in the design.

h). When adjustable steel props are used, they should i). Be undamagedand not visibly bent. ii). Have the steel pins provided by themanufactures for use. iii). Be restrained laterally near each end. (iv).Have means for centralizing beams placed in the fork heads.

i). Screw adjustment of adjustable props shall not be over extended.

j). Double wedges shall be provided for adjustment of the form to the requiredposition wherever any settlement / elastic shortening of props occurs. Wedgesshould be used only at the bottom end of single prop. Wedges should not be toosteep and one of the pair should be tightened / clamped down after adjustment toprevent their shifting.

k). No member shall be eccentric upon vertical member.l). The number of nuts and bolts shall be adequate.m). All provisions of the design and / or drawings shall be complied with.n). Cantilever supports shall be adequate.



Section V 19

o). Props shall be directly under one another in multistage constructions as far aspossible.

p). Guy ropes or stays shall be tensioned properly.

q). There shall be adequate provision for the movement and operation of vibratorsand other construction plant and equipment.

r). Required camber shall be provided over long spans.

s). Supports shall be adequate, and plumb within the specified tolerances.

g) FORM OIL:Use of form oil shall not be permitted on the surface, which required painting. If

the contractor desire to use form oil on the inside of form work of the other concretestructures, a non staining mineral oil or their approved oil CEMOL-35 of Ms.HindustanPetroleum Co. Ltd; may be used, provided it is applied before placing reinforcing steeland embedded parts. All excess oil on the form surfaces and any Oil on metal or other

parts to be embedded in the concrete shall be carefully removed. Before treatment withoil, forms shall be thoroughly cleared of dried splatter of concrete from placement ofprevious lift.

h) Working platform

The Contractor shall provide safe working platform for workmen, when working aboveground level. Safe method of approach shall be provided to reach locations aboveground level. Handrails shall be provided for all working platforms. Hanging platformsshall have safety net provisions. All ladders shall have handrails and shall not be keptvertical. All platforms, ladders handrails etc. shall be firmly secured to ground or onsupports. No loosely supported ladders or platforms shall be used in the works. Allladders and platforms shall have a kick plate 150mm high either MS or wooden boardfor safety of personnel. Ladders and platforms shall be periodically cleaned of loosedebris etc.

h) CHAMFERS AND FILLERS:

All corners and angles exposed in the finished structure shall be formed withmoulding to form chamfers or fillers on the finished concrete. The standard dimensionsof chamfers and fillets, unless otherwise specified, shall be 20 x20 mm. Care shall beexercised to ensure accurate moulding. The diagonal face of the moulding shall beplaned or surfaced to the same texture as the forms to which it is attached.

j) VERTICAL CONSTRUCTION JOINT CHAMFERS:Vertical construction joints on faces which will be exposed at the completion of

the work shall be chamfered as above except where not permitted by Engineer-in-Charge for structural or hydraulic reasons.



Section V 20

k) REUSE OF FORMS:Before reuse, all forms shall be thoroughly scraped, cleaned, nails removed;

holes that may leak suitably plugged and joints examined and when necessary repairedand the inside retreated to prevent adhesion, to the satisfaction of Engineer-in-charge.Wrapped lumber shall be resized. Contractor shall equip himself with enough shutteringto complete the job in the stipulated time.

l) STRIKING REMOVAL OF FORMS:

No forms shall be removed or staging struck until it is safe to do so and approvedby the Engineer. All vertical-centering members shall be sufficiently braced with stiffmembers. Bamboos shall not be used as bracing members.

No forms shall be removed or staging struck until it is safe to do so and approvedby the Engineer. All vertical-centering members shall be sufficiently braced with stiffmembers. Bamboos shall not be used as bracing members No forms shall be removedor staging struck until it is safe to do so and approved by the Engineer. All vertical-centering members shall be sufficiently braced with stiff members. Bamboos shall notbe used as bracing members. All formwork shall be removed without shock or vibrationand without damaging the new concrete. The side forms shall be so fixed that whileremoving the supporting forms and posts are not disturbing to any extent. In nocircumstances should the supporting forms be struck until the' concrete reaches astrength of at-least twice the stress to which the concrete may be subject at the time ofstriking. Under normal conditions the periods shown below are the minimum whichshould be allowed between the placing of the concrete and removal of the forms. Incase of horizontal members it is desirable that the supports or props should be kept forsufficiently long period in order to present sagging of the members.

EARLIEST CONCRETE AGE AT STRIPPINGNormal weather temp.

above 20 oCSl.No. Class of structures Ordinary Portland

cementPortland Pozzolana

cement

a.Walls, columns andvertical sides of beam

After 16 to 24 hours After 72hours

b. Slab props (left under) 3days

c.Beams soffits (propsleft under)

7days

d.Removal of props toslabs

d.1 Spanning up to 4.5mts 7days 14daysd.2 Spanning over 4.5mts 14days 21dayse. Removal of propos to

slabse.1 Spanning up to 6.0mts 14days 21dayse.2 Spanning over 6.0mts 21days 28daysF Cantilever construction Not until adequate strength is developed



Section V 21

m) MODE OF MEASUREMENT:In case the items of concreting are inclusive of cost of formwork, no separate

measurements shall be taken for formwork. However, if the form work is to be paidseparately and the item exists in the schedule of quantities for various types of formwork the net area of exposed surface of concrete members as shown in drawingscoming in contact with form work shall be measured under item of formwork in squaremeters.

All temporary formwork such as bulkheads, stop boards provided at construction joints, which are not shown in the drawings, shall not be measured.

No deductions shall be made for openings/obstructions up to an area of 0.1sqmt and nothing extra shall be paid for forming such openings.

The rate includes the cost of scaffolding, shuttering materials, erection charges,transport, de-shuttering and removal of materials from site and inclusive of all labourand consumables required for all such operations.

STEEL REINFORCEMENT:

All reinforcement bars supplied by contractor shall be of grade Fe 415 TMT barsconform strictly to I.S. 432/1786 latest revision. Reinforcing rods shall be fabricated toshapes and dimensions shown and shall be placed where indicated on the drawings, orrequired to carryout intent of drawing and specifications. Before being placed,reinforcement shall be thoroughly inspected and cleaned. Reinforcement shall not bebent or straightened in manner injuries to the material. Bars with kinks or bends notshown on drawings shall not be placed. The reinforcement shall be cleaned of rust andscales at all stages of work without extra cost to the Department. Reinforcement shallnot be spliced at points of maximum stress. Laps for reinforcement shall 40 times thedia for column, beam, slab etc. unless otherwise specified in the drawing. Theintersections of 4 rods crossing each other shall be bound with 16 SWG binding wiresuch that joints will not be displaced in the process of placing concrete.

The cost of steel used by the Contractor in the reinforcement of beam, slabs andcolumns etc. will be paid as per rate for reinforcement only up to the extent shown in thedrawings. Any laps and hooks provided by the Contractor for his own convenience shallnot be measured for payment. Splices in adjacent bars shall be staggered. Thereinforcing bars shall be placed as directed by the Engineer and shall be kept rigidly inposition while the concreting is being done. The correct clearance from the formwork, asindicated under Para 'Concrete cover over reinforcement' below shall be maintained byusing either pre-cast blocks or metal chairs to be provided by the Contractor withoutextra charge. The pre-cast blocks used for spacing will be properly cast and cured and

will be of the same mix, as of the concrete. Spacers and supporting chairs provided forcorrect positioning of various layers of reinforcement will be provided without any extracharge.

a) STORAGE:The reinforcement steel shall not be kept in direct contact with ground but

stacked on top of an arrangement of timber sleepers or the like. Reinforcement steelshall be coated with cement wash before stacking to prevent scale and rust if it has tobe stored for longer time. Fabricated reinforcement shall be carefully stored to preventdamage, distortion, corrosion and deteriorations.



Section V 22

b) QUALITY:All steel shall be Grade Fe 415 as per 1786 quality unless specifically permitted

by the Engineer-in charge. No re-rolled material will be accepted. The contractor shallsubmit the manufacturers test certificate for steel of each consignment delivered at site.If demanded by the Engineer-in-charge the contractor shall submit the third party testcertificate for each 50 MT. The department shall perform random tests on steel suppliedby the contractor as per relevant Indian Standards. All costs incidental to such testsshall be at Contractors expense. Steel not conforming to specifications shall berejected. All reinforcement shall be clean, free from grease, oil, paint, dirt, loose mill,scale, loose rust, dust, bituminous material or any other substances that will destroy orreduce the bond. All rods shall be thoroughly cleaned before being fabricated. Pittedand defective rods shall not be used. All bars shall be rigidly held in position beforeconcreting. No welding of rods to obtain continuity shall be allowed unless approved bythe Engineer-in-charge. If welding is approved, the work shall be carried as per I.S.2751, according to best modern practices and as directed by the Engineer-in-charge. Inall cases of important connections, tests shall be made to prove that the joints are of thefull strength of bars welded. Special specifications, as specified by the Engineer-in-charge shall be adhered to in the welding of cold worked reinforcing bars and bars other

than mild steel.c) Splicing of Reinforcement Bars:

Lap splicing Lapping of reinforcement bars shall be done at locations as shown in the drawings or asdirected by the Engineer. However not more than 50% of the splices shall be providedin one location. The lap length shall not be less than that specified in the drawings. If notspecified, the lap length shall be decided by the Engineer. Splices in adjacent bars shallbe staggered and the locations of all splices, except those specified on the drawingsshall be approved by the Engineer. The bars shall not be lapped unless the lengthrequired exceeds the maximum available lengths of bars. At such locations, whereby

providing lap splice is giving rise to congestion of reinforcement or wherever required asper Engineer, such splice shall be replaced with welding/ mechanical splicing at thediscretion of the Engineer.

d) BENDING:All bars shall be accurately bent according to the sizes and shapes shown on the

detailed working drawing bar bending schedules. They shall be bent gradually bymachine or other approved means. Reinforcing bars shall not be straightened and re-bent in a manner that will injure the materials. Bars containing cracks or splits shall berejected. They shall be bent cold, in all diameters. Bars incorrectly bent shall be usedonly of the means used for straightening and rebinding in the opinion of the Engineer-in-

charge injures the material. No reinforcement bar shall be bent when in position in thework without approval, whether or not it is partially embedded in hardened concrete.Bars having kinks or bends other than those required by design shall not be used.



Section V 23

e) BENDING AT CONSTRUCTION JOINTS:Where reinforcement bars are bent aside at construction joints and afterwards

bent back into their original position, care should be taken to ensure that at no time theradius of the bend is less than 4 bar diameters for plain mild steel or 6 bar diameters fordeformed bars. Care shall also be taken when bending back bars to ensure that theconcrete around the bar is not damaged.

f) FIXING/PLACING AND TOLERANCE ON PLACING:Reinforcement shall be accurately fixed by any approved means maintained in

the correct position as shown in the drawings by the use of blocks, spacers and chairsas per IS.2502 to prevent displacement during placing and compaction of concrete.Bars intended to be in contact at crossing point shall be securely bound together at allsuch points with number 16 gauge annealed soft iron wire. The vertical distancesrequired between successive layers of bars in beams or similar members shall bemaintained by the provision of mild steel spacer bars at such intervals that the mainbars do not perceptibly sag between adjacent spacer bars.

g) TOLERANCE ON PLACING OF REINFORCEMENT:

Unless otherwise specified by the Engineer-in-charge reinforcement shall beplaced within the tolerances given in IS 456-2000

h) COVER TO REINFORCEMENT:

The cover shall be as specified in the drawings. Unless otherwise specified, thecover shall be given as per IS 456-2000.The minimum clear distance betweenreinforcing bars shall be in accordance with IS-456 or as shown in drawing.

i) INSPECTION:Erected and secured reinforcement shall be inspected and approved by

Engineer-in-charge prior to placement of concrete.

j) MODE OF MEASUREMENT FOR REINFORCEMENT FOR RCC WORKS:Reinforcement as detailed in schedule of quantities shall be measured for

payment linearly as per the cutting length nearest to a centimeter shown in bar bendingschedule submitted by the contractor and approved by the Engineer-in-charge andweight calculated based on the standard weights. The unit weight of steel shall be takenas given below.

No allowance shall be made/be measured in the weight for rolling margin. Onlyauthorized laps shall be measured. As far as possible, laps in bars shall be avoided.Any laps and hooks provided by the contractor other than authorized as per approvedbar bending schedule will be considered to have been provided by the contractor for hisown convenience and shall not be measured for payment. Pins, chairs, spacers shall beprovided by the contractor wherever required as per drawing and bar bending scheduleand as directed by the Engineer-in-charge and shall be measured for payment. Fanhooks as required shall be provided by the contractor under this item and shall bemeasured for payment.

The rate shall be the cost of all materials and labour required for all above,operations including transport, wastage straightening, cutting, bending, binding and thebinding wire required, and the cost of the cover block.



Section V 24

a) Bar or any other type of reinforcement used for reinforced concrete shall bemeasured by weight in M.T.

b) Standard hooks, authorized chairs, cranks, bends authorized laps etc. shall bemeasured.

c) Separate pieces between two or more layers of steel shall be measured.d) No separate payment shall be made for binding wires.e) No payment shall be made for the waste in cut pieces of bars etc.f) Fan hooks shall be measured as part of reinforcement.

g) The rate shall include for straightening the bars/coils and cleaning as perspecification. No separate payment shall be made for placing at various lifts.

The contractor shall record the date upon which each part of the work is concretedtogether with the date upon which the shuttering is removed. No shuttering or centeringshall be removed until an approved period has elapsed since the last date on which theconcrete was placed in the parts of the work, concerned. Notwithstanding the approvalof the Engineer any damage or other consequence arising there from shall be thecontractor's entire responsibility.

*****

CEMENT PLASTERING FOR WALLS AND CEILINGS

SCOPE OF WORK:

The work covered under these specifications consists of supplying all materials andrendering all types of plaster / pointing finishes strictly in accordance with thesespecifications, applicable drawings etc.

GENERALCement sand and water required for the work shall conform to specifications laid downherein before under section cement concrete (plain and reinforced), except that sand forfinishing coat shall be fine sand conforming to I.S. 1542 -1960. The plastering worksshall generally conform I.S. 1661 – 1978 (Pt. III) (Code of practice for cement andcement lime plaster finish on walls and ceilings). All general precautions as specified inI.S. 1661 – 1987 (Pt. III) clause-8, shall be taken and preparation of the back groundshall be done as laid down in I.S. 1661 clause 12 and I.S. 2402 – 1963 shall begenerally followed for rough cast and sand faced plaster work. The contractor at hisown cost shall provide scaffolding required for facility of working. This may be double orsingle according to the requirement and shall be approved by the Engineer – in – charge. Stage scaffolding shall be erected when ceiling plastering is done. The

contractor shall be responsible for accidents, if any, take place. The contractor shall co-operate with the other agencies also. Whenever electrical contractor/agency has to fixup switch boxes in walls, necessary Thiyyas, tapanish or Dhadas shall be arranged tobe given in advance of actual plastering process at these locations so that the boxesare fixed properly in line with finished plaster surface. All finishing in and around theseboxes as also around the conduit boxes in ceiling shall be done by plastering contractorwithout any extra cost to the Department. The decision of the Engineer-in-charge in thisregard shall be final and binding on the contractor.



Section V 25

PREPARATION OF SURFACE:

The surface to be plastered shall first be thoroughly cleaned of all muck and cleaneddown. All joints shall be raked out in case of brick work/stone masonry and closelyhacked in case of concrete as the work proceeds. The surface to be plastered shall bewell wetted for a minimum period of 6 hours before commencing the work. The mortarfor all plaster work shall be cement mortar of mix as specified in the schedule ofquantities.

After erection of scaffolding and before commencement of plastering work, top most junctions/joints/sides with beam/ column shall be thoroughly packed with cement mortarto prevent cracks.

Before commencement of plastering operation the contractor shall ensure that all theservice pipes, electrical conduits, boxes, switch boxes etc. have been installed inposition by other agencies and the plastering surface is duly approved by the Engineer-in-charge. In order to enable other service contractors to fix the electrical conduits,

conduit boxes, EDBs, pipes, outlets etc. in proper level and line with reference to thefinished surface of the plaster. Thiyyas and Tapanis i.e. finished plaster patches shallbe given by the main civil contractor on walls, ceiling at regular intervals well in advanceof his plaster work at no extra cost to the department. The entire work of preparation ofsurface before plastering shall thus be co-ordinated by the main civil contractor with allother agencies working at site.

Just before actual plastering work is taken up in hand all the ceiling and walls etc, shallbe marked with Tapanis or Thiyyas indicating the thickness of plaster required andwhich shall be in true line, level and plumb. The contractor shall get these marksapproved by the Engineer-in-Charge before starting the plastering work. The contractorshall also be responsible to render the final surface true to line, level and plumb etc.

All building operations like construction of walls, concreting etc. shall have beencompleted before plastering is taken up. The plastering operation should be taken uponly after the service pipes etc. that are to be embedded in the wall or ceiling arecompleted and suitably protected against corrosion by other agencies and okayed bythe Engineer-in-charge. Damage if caused to any of the existing fittings, fixturesincluding doors and windows etc. during the plastering operation shall be made good bythe contractor at his own cost.

If the surface which is to be plastered either internally or externally is out of plumb andnot in line and level and if the plastering to be done is more than specified thickness tobring the plastered surface to perfect line and levels, in such specific cases. Chickenwire mesh is to be provided by the contractor at his own cost and the plaster should bedone to required line and level with no extra cost whatsoever.

The finished plastered surfaces shall be free from cracks, fissures, crevices, hair cracks,blistering, local swellings and flaking. The finished surface shall be true to line, level,plumb & plain and durable. The adhesion of the mortar with the background surface isof prime importance as this affects durability of plaster preparation of surface which hasto take plastering is of great importance. Before starting the plastering work the surfaceshould be got approved by the Engineer-in-Charge.



Section V 26

In order to avoid the formation of deep and side cracks and for dispersion of cracks atthe junctions between concrete surface and brick masonry work as also between

junction of windows/door frames and brick masonry works, cautionary measures suchas fastening and lapping of chicken mesh over the junction areas should be carried outover which the plastering work has to be taken up as required by the Engineer-in-charge.

The minute gap between window/door frames with cills and jambs should be filledup/caulked by plaster of paris/epoxy putty/silicon sealants, Rubber based sealants(brand name TECHMAT/TECHCOAT) by caulking guns or by approved methods asinstructed/approved by Engineer-in-Charge.

GROOVES:

The grooves shall be or required dimensions. The same shall be made to turnwherever necessary. The finish, inside, shall be of the same finish as that of theplaster. The lines of the grooves shall be well defined and rounded. The grooves are tobe provided in plastering in internal and external surfaces and shall be paid extra in the

rates give in schedule of quantities.MIX PROPORTIONS:The mortar for plastering shall be of proportion as specified in the item schedule. Themixes specified in the schedule are volumetric.

MIXINGCement and fine aggregates shall be mixed dry in the required proportions to obtain auniform colour. Water shall then be added to get the required consistency for theplaster.

Mixing shall be done mechanically. However, manual mixing will be allowed only inexceptional circumstances at the discretion of the Engineer-in-Charge. Manual mixing,where adopted, shall be carried out on a clean water tight platform. After water isadded during mixing, the mix shall be held back and forth for 10 to 15 minutes.

In machine mixing, the mixer shall run atleast five minutes after placing all theingredients in the drum. Only so much quantity of mortar which can be used within halfan hour after the addition of water shall be prepared at a time. Any mortar for plasterwhich is set or partially set shall be rejected and shall be removed forthwith from thesite.

12 MM PLASTER

The plaster shall be laid with somewhat more than 12 mm, thickness and pressed andlevelled with wooden ruler to a finished thickness of 12 mm. Straight edges shall befreely used to ensure a perfectly even surface. All exposed angles and junctions ofwalls, doors, windows, beams, slabs etc. shall be carefully finished so as to furnish aneat and even surface.



Section V 27

20 MM PLASTER

The proportions of sand and cement shall be as specified and shall cover allirregularities, undulations, depressions due to chasing etc. in the surface to beplastered. The mortar shall be applied slightly more than 20mm. thick and pressed andlevelled with wooden ruler or straight edge to finished thickness of 20mm. Straightedges shall be freely used to ensure a perfectly even surface. The finished surfaceshall be true and even and present uniform texture throughout and all joining marksshall be eliminated. All corners, edges and angles shall be made perfectly to line, planeand plumb.All exposed angles and junctions of walls, doors, windows, beams, slabs etc. shall becarefully finished so as to furnish a neat and even surface.

Plastering items amongst all other things as described in various items also include:

i) Preparation of surfaces to receive the plaster, providing cement plaster of thespecified average thickness and proportions with specified number of coats.

ii) All labour, materials, scaffolding, use of tools and equipment to complete theplastering work as per specifications.iii) Curing for 10 days.iv) Cleaning the surface of doors, windows, floors or any other surface where

plastering might have splashed.v) Finishing the portion of plaster left above the terrazzo, plain cement tiles, ironite

or any type of skirting work to be finished rounded or as directed by theEngineer-in-Charge, in a separate operation after laying of floors tiles, skirting.

MODE OF MEASUREMENT:Area of plastering will be measured net and shall be paid for. The measurement oflength of wall plastering shall be taken between walls or partitions (dimensions before

plastering shall be taken) for the length and from top of the floor or skirting or dado asthe case may be to the underside of ceiling for the height. All openings more than 0.1sqm. shall be deducted and all jambs, soffits, sills of these openings if done, will bemeasured to arrive to the net area for payment. No opening less than 0.1 sqm. shall bededucted and no jambs etc. for such openings shall be measured for payment. The rateshall include the cost of finishing all the edges, corners, cost of all materials, labours,scaffolding, transport, curing etc.

The rate shall include the cost of finishing all the edges, corners, cost of all materials,labour, transport, scaffolding, curing etc. and grooved if so specified in the item ofschedule of quantities.

The rate for plastering should include the cost of work towards the following items forco-ordination with electrical item.

1. Neatly plastering around DBs, junction boxes, M.S. boxes etc. should be doneand made matching with the wall finish after installation of electrical equipments.

2. All DBs, service boxes, covers etc. should be covered by a plastic cloth or othersuitable covering materials such that water or materials should not splash thesame during brick work and plastering work. This is to be done in such a waythat electrical equipments as well as painted surfaces are not spoiled.



Section V 28

3. For fixing M.S. boxes, DBs etc. Thiyya should be given such that the requiredface of the M.S. box, DB covers etc inline with final finished plastered surface.

4. The rate for the item shall also include rounding up of corner and angles makingsharp corners and angles finishing around ceiling rose and electrical fittings etc.fixed by other agencies, finishing of top of dado and skirting (zad finishing),

junctions of roof and wall or beam with the finish as specified in the item.Plastering of brick and concrete cornice and copings and plastering in restrictedareas if any shall not be measured separately. Architectural bands and narrowwidths of plaster over structural as well as non-structural and the line whenprepared in the same thickness of plaster shall not be measured separately andshall be covered by respective plaster items.

******

CUDDAPPAH STONE FLOORING/SKIRTING/FACIA/SHELVES:

MATERIALS :

Hand cut/machine cut for exposed edges and machine polished Cuddappah stone shallbe of the best quality and of the specified thickness, size and the shade which shall begot approved by the Engineer-in-charge. The size given in schedule of quantities aretentative and can vary only slightly as per availability in the market. The thickness ofthe slab after it is dressed shall be 20, 25, 30 or 40 mm as specified in the item.Tolerance of + 2 mm shall be allowed for the thickness. In respect of length & width,tolerance in length & width shall be permissible up to + 5 mm for hand cut slabs & +2mm for machine cut slabs. At its thinnest, no stone shall be thineer than the specifiedthickness. The stone shall be hard sound, durable, resistant to wear, rectangular orsquare in shape and as directed by the Engineer-in-charge. Uniformity of size shallgenerally be maintained for the stones used in any one room. The stone shall bewithout any soft. Veins, cracks or flaws and shall have uniform colour. They shall have

natural surface free from broken flakes on top, and the exposed surface shall bemachine polished to a smooth, even and true plane and the edges hand cut anddressed true and squares. The evenness of the surface of slabs and edges of the slabshall not be marred by careless dressing or handling and no patching up shall beallowed for the slab. The edges shall be quite straight. The under face may be left asrequired or rough dressed. Before taking up the work samples of stone slabs, to beused and their dressing and polishing shall be got approved by the Engineers-in-chargeand will keep them in his office for reference and the stone slabs to be used shallconform to the approved sample.

BEDDING /BACKING COAT

In case of flooring, the mortar bedding shall be cement mortar and in case ofskirting/dado, mortar bedding shall be cement mortar of thickness and mix specified inthe schedule of item.

CEMENT MORTAR

Cement mortar bedding shall be as specified under relevant specification forterrazzo/plain cement tile flooring.



Section V 29

CONSTRUCTION DETAILS

Cement mortar as specified for bedding shall be uniformly mixed. The amount of wateradded shall be the minimum necessary to give just sufficient plasticity for laying andsatisfactory bedding care shall be taken in preparing the mortar to ensure that there arenot hard lumps that would interfere with the even bedding of the stones. Beforespreading the mortar the sub-floor or base shall be cleaned of all dirt, set mortar scumor laitance and of loose materials by hacking and brought to original levels and then wellwetted without forming pool of water on surfaces.

FIXING THE STONE SLAB/TILE :

Before laying, the stone shall be thoroughly wetted with clean water, neat cement grout(2.75 kg/sq.m) of honey like consistency shall be spread on the mortar bed over asmuch areas as could be covered with the slabs within half an hour. The specified typeof stone shall be laid on the neat cement float and shall be evenly and firmly bedded tothe required level and slop in the mortar bed. Each stone shall be gently tapped withwooden mallet till it is firmly and properly bedded.

There shall be no hollows left. If there is a hollow sound on gently tapping off the slab,such slab shall be removed and reset properly. The joints shall be grouted withmatching cement slury. Approved pigment shall be used in cement slurry to match withshade of stone. Pigment required to match the shade of stone shall be supplied by thecontractor at no extra cost. The stone adjoining the wall shall go about 12mm (about½”) under the plaster, skirting or dado for the wall. All stone slabs, tiles shall be so laidas to have continuous lines from various rooms to the corridors. No change of linesshall be permitted at junction between two rooms and corridors. Only one piecemachine cut, Cuddappah stone shall be used for trades and risers.

CURING:

The flooring shall be kept well wetted with damp sand or water for seven days.

POLISHING AND CLEANING :

When the bedding and joints have completely set and attained required strength, thesurface shall be machine polished to give smooth even and true plane to the flooring.All flooring shall be thoroughly cleaned and handed over free from any mortar stainsetc.

SKIRTNG AND DADO/FACIA :

The quality and type of stone shall be same as mentioned for flooring except of theirheight and thickness or backing coat which shall be as mentioned in item schedule.The backing shall conform to the specifications for cement mortar specified for item ofceramic tiles. Contractor should take into consideration the fact that touching up of theplaster at the junction of skirting/dado is invariably done after the skirting/dado/ faciawok is completed and quote rates accordingly. No extra for this touching up will beentertained.



Section V 30

Fixing, curing, polishing and cleaning shall be as specified herein before undercement/terrazzo tile skirting polishing may be done by hand, but a smooth surface andfine polishing shall be obtained. Joints shall be done in near matching cement slurry.The junction of plaster and the upper edges of the dado/skirting shall be finishedsmoothly as directed by the Engineer-in-charge without any extra cost.

MODE OF MEASUREMENTS:

Flooring, skirting and dado/ facial shall be same as that for terrazzo cement tile,flooring/skirting/dado. Shelves shall be paid on area basis in sqm. Calculated to twoplaces of decimal, where length and breadth shall be measured inclusive of bearingscorrect to a cm. The permissible tolerance in the specified thickness shall be ( + ) 2mm.

Note:

Wastage in obtaining the required machine cut, hand cut sizes as specified from the

commercial sizes available in market shall have been taken into consideration bycontractor while quoting the rate for work to be measured as above and no extra claimon this account will be entertained.

*****

PAINTING:

SCOPE OF WORK:The work covered under these specifications consist of furnishing the various types ofpaints and also the workmanship for these items, in strict compliance with thesespecifications, which are given in detail here-in-after with the item of schedule of

quantities.

MATERIALS: Paints, oils, varnishes etc. of approved brand and manufacture shall be used. Readymixed paints as received from the manufacturer without any admixture shall be used.

If for any reasons, thinning is necessary in case of ready mixed paint, the brand ofthinner recommended by the manufacturer or as instructed by the Engineer-in-Chargeshall be used. Approved paints, oils or varnishes shall be brought to the site of work bythe contractor in their original containers in sealed condition. The materials shall bebrought in at a time in adequate quantities to suffice for the whole work or atleast afortnights work. The materials shall be kept in the joint custody of the contractor and theEngineer-in-Charge. The empties shall not be removed from the site of work, till therelevant item of work has been of copleted and permission obtained from the Engineer-in-Charge.

The contractor shall associate the chemist of paint manufacturers beforecommencement of work, during and after the completion of work who shall certify thesuitability of the surface to receive painting and the paint before use etc.



Section V 31

COMMENCING WORK:

Scaffolding: Wherever scaffolding is necessary, it shall be erected on double supportstied together by horizontal pieces over which scaffolding planks shall be fixed. Noballies, bamboos or planks shall rest on or touch the surface which is being painted.

Where ladders are used, pieces of old gunny bags shall be tied on their tops to avoiddamage or scratches to walls.

For painting of the ceiling, proper stage scaffolding shall be erected.

Painting shall not be started until and unless the Engineer-in-Charge has inspected theitems of work to be painted, satisfied himself about their proper quality and given hisapproval to commence the painting work.

Painting except the priming coat, shall generally be taken in hand after all other builderswork, practically finished.

The rooms should be thoroughly swept out and the entire building cleaned up at leastone day in advance of the paint work being started.

PREPARATION OF SURFACE:The surface shall the thoroughly cleaned. All dirt, rust, scales, smoke and grease shallbe thoroughly removed before painting is started. Minor patches if any in plastered/formfinished surfaces shall be repaired and finished in line and level in C.M. 1:1 and cracks& crevices shall be filled with approved filler, by the contractor at no extra cost to theDepartment. The prepared surface shall have received the approval of the Engineer-in-Charge after inspection, before painting is commenced.

APPLICATION:Before pouring into smaller containers for use, the paint shall be stirred thoroughly in itscontainers. When applying also the paint shall be continuously stirred in the smallercontainers so that consistency is kept uniform.

The external surfaces of the buildings under reference including the R.C.C. Jalli, finsand the panels above and below the window etc. shall be finished in different colours ofapproved shade. The contractor will make suitable samples at site for Departmentsapproval before taking up the work in hand and they will be allowed to proceed with thework only after getting Department approval for the same.

The painting shall be laid on evenly and smoothly by means of crossing and laying off,the later in the direction of the gain in case of wood. The crossing & laying off consistsof covering the area with paint, brushing the surface hard for the first time and thenbrushing alternately in opposite directions two or three time and then finally brushinglightly in direction at right angles to the same. In this process, no brush marks shall beleft after the laying off is finished. The full process of crossing and laying will constituteone coat.

Where so stipulated, the painting shall be done with spraying. Spray machine usedmay be (a) a high pressure (small air aperture) type or (b) a low pressure (large air gap)type, depending on the nature and location of work to be carried out. Skilled and



Section V 32

experienced workmen shall be employed for this class for work. Paints used shall bebrought to the requisite consistency by adding a suitable thinner. Spraying should bedone only when dry condition prevails.

Each coat shall be allowed to dry out thoroughly and rubbed smooth before the nextcoat is applied. This should be facilitated by thorough ventilation.

Each coat except the last coat, shall be lightly rubbed down with sand paper or finepumice stone and cleaned of dust before the next coat is laid.

No left over paint shall be put back into the stock tins. When not in use, containers shallbe kept properly closed.

The final painted surface shall present a uniform appearance and no streaks, blisters,hair marks from the brush or clogging of paint puddles in the corners of panels, anglesof mouldings etc. shall be left on the work.

In case of cement based paints/primers, the absorbent surfaces shall be evenly damped

so as to give even suction.In painting doors and windows, the putty around the glass panes must also be painted,but care must be taken to see that no paint stains etc. are left on the glass. Tops ofshutters and surfaces in similar hidden locations shall not be left out while painting.Perspect covers of electrical switch boxes have to be painted from inside by removingthem. Care shall be taken while removing them in position after painting with respectiveapproved paints. In painting steel work, special care shall be taken while painting overbolts, nuts, rivets, overlaps etc.

The additional specifications for primer and other coats of paints shall be as inaccordance to the detailed specifications under the respective headings.

Any damage caused during painting work to the existing works/surfaces shall be madegood by the contractor at his own cost.

BRUSHES AND CONTAINERS:After work, the brushes shall be completely cleaned off paint and linseed oil by rinsingwith turpentine. A brush in which paint has dried up is ruined and shall on no accountbe used for painting work. The containers, when not in use, shall be closed, kept airtight and shall be kept at a place free from dust. When the paint has bee used, thecontainers shall be washed with turpentine and wiped dry with soft clean cloth, so thathey are clean & can be used again.

MEASUREMENT:

a) Painting, unless otherwise stated shall be measured by area in square metre.Length and breadth shall be measured correct puts two places of decimal of ametre.

b) No deduction shall be made for opening not exceeding 0.05 sqm. and no additionshall be made for painting to the beading, moulding edges, jambs, soffits, sils,architraves etc. of such openings.



Section V 33

c) In measuring painting, varnishing, oiling etc. of joinery and steel work etc., theco-efficients as in the following table shall be used to obtain the areas payable.The co-efficients shall be applied to the areas measured flat not girthed in allcases.

d) In case of painting of door shutter with push plates in plastic laminate, deductionwill be made for area of such laminations.

Table of co-efficients to be applied over areas of different surfaces to get equivalentplain areas.

Sl.No

Description of Work Multiplying C0-efficients

I WOOD WORK: DOORS, WINDOWS ETC.1 Panelled of framed and braced doors, windows etc.2 Ledged and battened or ledged, battened and braced

doors, windows etc. 1.30 (for each side)3 Flush door etc. 1.20 (for each side)4 Part paneled and part glazed or gauzed doors,

windows etc.

1.00 (for each side)

5 Fully glazed or gauzed doors, windows etc. 0.80 (for each side)6 Fully venetioned or louvered doors, windows etc. 1.80 (for each side)7 Trellis (or Jaffri) work one way or two way 2.00 (for painting all over)8 Carved or enriched work: 2.00 (for each Side)9 Weather boarding: 1.20 (for each side)10 Wood shingle roofing: 1.10 (for each side)11 Boarding with cover fillets and match boarding 1.05 (for each side)12 Tile and slate battening: 0.80 (for painting all over)II STEEL WORK: DOORS, WINDOWS ETC.13 Plain sheeted steel door or windows: 1.10 (for each side)14 Fully glazed or gauzed steel doors and windows 0.50 (for each side)

15 Partly panelled and partly gauzed or glazed doors andwindows 0.80 (for each side)

16 Corrugated sheeted steel doors or windows 1.25 (for each side)17 Collapsible gates 1.50 (for painting all over)18 Rolling shutters of inter looked laths. 1.10 (for each side)III GENERAL WORKS:19 Expanded metal, hard drawn steel wire fabric of

approved quality, grill work and gratings in guard bars,balusters, railings, partitions and m.s. bars in windowframes.

1.00 (for painting all over)

NOTE: The height shall be taken from the bottom of the lowest rail, if the palisades donot go below it (or from the lower end of palisades, if they project below the lowest rail)upto the top of palisades but not puts the top of standards, if they are higher than thepalisades.

21 Corrugated iron sheeting in roofs, side cladding etc. 1.14 (for each side)22 A.C. Corrugated sheeting in roofs, side cladding etc. 1.20 (for each side)23 A.C. Semi-corrugated sheeting in roofs, side cladding

etc.1.10 (for each side)

24 Wire gauze shutters including painting of wire gauze. 1.00 (for each side)



Section V 34

Explanatory notes on the table of Co-efficients

1. Where doors, window etc. are of composite types other than those included inrelevant para the different portions shall be measured separately with theirappropriate co-efficients, the centre line of the common rail being taken as thedividing line between the two portions.

2. Measurements for doors, windows etc. shall be taken flat (and not girthed) overall including chowkhats or frames, where provided. Where chawkhats or framesare not provided, the shutter measurements shall be taken.

3. Collapsible gates shall be measured for width from outside to outside of gate inits expanded position and for height from bottom to top of channel verticals. Noseparate measurements shall be taken for the top and bottom guide, rails, rollersfittings etc.

4. Rolling shutters of interlocked laths shall be measured for the actual shutter widthand the height from bottom of opening to the centre of the shaft. No separatemeasurements shall be taken for painting guides and other exposed featureswithin or outside the shutter area. The painting of top cover or hood shall

however be measured separately.5. Co-efficients for stiding doors shall be the same as for normal types of doors asmentioned in the table. Measurements shall be taken outside be shutters, andno separate measurements shall be taken for painting guides.

6. Measurement of painting of ddors, windows, coliapsible gates, rolling shuttersetc. as above shall be deemed to include painting all iron fittings in the same ordifferent shade for which no extra will be paid.

7. The measurements as above shall be deemed to include also the painting ofedge, blocks, cleats etc. for which no extra will be paid.

8. The co-efficients for doors and windows shall apply irrespective of the size offrames and shutter members.

9. When the two faces of a door, window etc. are to be treated with different

specified finishes, measurable under separate items, the edges of frames andshutters shall be treated with the one of the other type of finish as ordered by theEngineer-in-Charge, and measurement of this will be deemed to be included inthe measurement of the face treated with that finish.

10. In the case where shutters are fixed on both faces of the frames, themeasurements for the door frame and shutter on one face shall be taken in themanner already described while the additional shutter on the other face will bemeasured for the shutter area only excluding the frame.

11. Where shutters are provided with clearance at top or/and bottom, such openingsshall be deducted from the over all measurements and relevant co-efiicients shallbe applied to obtain the area payable.

12. In case of trellis (or jaffri) work, the measurements shall include the painting ofthe frame member for which no separate measurements shall be taken. Trellisdoor or window shutter shall also be measured under trellis work.

13. Wherever air conditioning grill, lighting, fixtures etc. in false ceiling are paintedalong with, measurements shall be taken over all without deductions for openingin grills and no extra shall be paid for the grills. If grills, fixtures etc. are notpainted, area of fixtures or grills as measured flat (not grithed) shall be deductedwhen it exceeds 0.05 sqm. individuals. Where walls and ceilings are painted inseparate colours, the junctions of two paints shall be brought down in the walls ina straight line by above 6mm to 12mm if so desired, if the junctions of walls andceilings are not even. Nothing extra shall be paid to the contractor on this



Section V 35

account. Beading wherever provided shall not be measured separately but shallbe deemed to be included in the area of false ceiling etc. measured flat (notgrithed).

14. For painting open palisade fencing and gates etc., the height shall be measuredfrom the bottom of the lowest rail, if the palisades do not go below it, (or from thelower end of the palisades, if they project below the lowest rail), upto the top ofrails or palisades whichever are higher, but not up to the top of standards whenthe latter are higher than the top rails or palisades.

15. In the case of asbestos cement corrugated or semi-corrugated sheeting and ironcorrugated sheeting in roofs, side cladding etc., the work shall be measured flat(not girthed) as fixed).

16. For trusses, compound girders, stanchions, lattice girder and similar work actualareas will be measured in sqm. and no extra shall be paid for painting on boltheads, nuts, washers etc. even when the they are picked out in a different tint tothe adjacent work.

17. Painting of rain water, soil, waste, vent and water pipes etc. shall be measured inrunning metres of the particular diameter of the paid for painting on bolt heads,nuts, washers etc. even when they are picked out in a different tint to the

adjacent work.18. Measurements of wall surfaces and wood and other works not referred to alreadyshall be recorded as per actual and opening exceeding 0.05 sqm. shall bededucted to get the net payable area. Length and breadth shall be measuredcorrect upto two places of decimal of a metre and area so worked out shall becorrect upto two places of decimal of a square metre.

19. In case the items of work requiring painting are inclusive of cost of painting, thepainting carried out shall not be measured separately.

PRECAUTIONS:All furnitures, lightings, fixtures, sanitary fittings, glazing, floors etc. shall be protected bycovering and stains, smears, splashing, if any shall be removed and any damage done

shall be made good by the contractor at his cost.RATE:Rates shall include cost of all labour and materials involved on all the operationsdescribed above and in the particular specifications given under the several items.

(A) PAINTING PRIMING COAT ON WOOD, IRON OR PLASTERED SURFACES:Primer:1. The primer for wood work, iron work or plastered surface shall be as specified in

the description of the item.2. Primer for wood work/iron & Steel/Plastered/Aluminium surfaces shall be as

specified below:Surfaces Primer to be used

a. Wood work (hard & soft wood): Pink conforming to I.S.3536-1966.

b. Resinous wood and ply wood: Aluminium Primer

c. Iron & Steel, Aluminium and galvanizedsteel work:

Zinc chromate primerconforming to I.S. 104-1962.

d. Plastered surfaces, cement brick work,Asbestos surfaces for oil bound distemperand paint: Cement Primer.



Section V 36

3. The primer shall be ready mixed primer of approved brand and manufacture.

a) Wood work: The wood work to be painted shall be dry and free frommoisture.

The surface shall be thoroughly cleaned. All unevenness shall be rubbed downsmooth with sand paper and shall be well dusted. Knots, if any, shall be coveredwith preparation of red lead made by grinding red lead in water and mixing withstrong glue sized and used hot. Appropriate filler material with same shade aspaint shall be used where so desired by the Engineer-in-Charge.

The surface treated for knotting shall be dry before painting is applied. After thepriming coat is applied, the holes and indentation of the surface shall be stoppedwith glaziers putty or wood putty (for specifications for glaziers putty and woodputty-refer as mentioned here-in-before). Stopping shall not be done before thepriming coat is applied as the wood will absorb the oil in the stopping and thelatter is therefore liable to crack.

b) Iron and Steel Work: All rust and scales shall be removed by scrapping or bybrushing with steel wire brushes. Hard skin of oxide formed on the surface ofwrought iron during rolling which becomes loose by rusting, shall be removed.

All dust and dirt shall be thoroughly wiped away from the surface.

If the surface is wet, it shall be dried before priming coat is undertaken.

c) Plastered Surface: The surface shall ordinarily not be painted until it has driedcompletely. Trial patches of primer shall be laid at intervals and where drying issatisfactory, painting shall be taken in hand. Before primer is applied, holes andundulations, shall be filled up with plaster of paris and rubbed smooth.

Application: The primer shall be applied with brushes, worked well into the surfaceand spread even and smooth. The painting shall be done by crossing and laying off asdescribed here-in-before.

Other Details: The specifications for Painting (General) in relevant para shall hold goodso far as it is applicable.

(B) PAINTING WITH SUPERIOR QUALITY AND FLAT OIL READY MIXED PAINTSON NEW SURFACE:

Paint: Ready mixed paints shall be of approved brand and manufacture and of therequired shades. They shall conform in all respects to the relevant I.S. specifications.



Section V 37

Preparation of Surface:

(a) Wood work: The surface shall be cleaned and all unevenness removed as inrelevant para. Knots if visible, shall be covered with a preparation of red lead.Holes and indentations on the surface shall be filled in with glaziers putty orwood putty and rubbed smooth before painting is done. The surface should bethoroughly dry before painting.

(b) Iron and steel work: The primer coat shall have dried up completely beforepainting is started. Rust and scaling shall be carefully removed by scraping or bybrushing with steel wire brushes. All dust and dirt shall be carefully andthoroughly wiped away.

(c) Plastered surfaces: The priming coat shall have dried up completely beforepainting is started. All dust or dirt that has settled on the priming coat shall bethoroughly wiped before painting is started.

Application: The specifications mentioned here-in-before shall hold good as far asapplicable.

The number of coats to be applied will be as stipulated in the item. The painted surfaceshall present a uniform appearancel and glossy/semiglossy finish, free from streaks,blisters etc.

Other details: The specifications for Painting (General) specified here-in-before shallhold good in so far as they applicable.

(C) PAINTING WITH SYNTHETIC ENAMEL/SEMIGLOSSY PAINT ON NEW WORK:

1) Paint: Synthetic enamel/semi glossy paint of approved brand and manufactureand required shade shall be used for the top coat and an under coat of shade to

match the top coat as recommended by the manufacturer shall be used. Thepaint shall be conforming to IS:1932 – 1964. 2) Preparation of Surface: This shall be as per painting with superior quality ready

mixed paint as mentioned here-in-before.

3) Application: The number of coats including the under coat shall be asstipulated in the item.

3.1 Under Coat: One coat of the specified paint of shade to the shade of the tope coatshall be applied and allowed to dry over night. It shall be rubbed next day with the finestgrade of wet abrasive paper to ensure a smooth and even surface free from brushmarks and all loose particles shall be dusted off. All the cracks, crevices, roughnessetc. will be filled with approved putty as per manufacturers recommendations.

3.2 Top Coat: Finishing coats of specified paint of the desired colour & shade shall beapplied after the under coat is thoroughly dried. Additional finishing coats shall beapplied if found necessary to ensure a proper and uniform semi glossy surface.

4.Other Details: The specifications for “Painting (General)” mentioned here-in-beforeshall hold good as far as they are applicable.



Section V 38

(D) PAINTING WITH A CRYLIC EMULSION/PLASTIC EMULSION PAINT

1. This shall be polyvinyl based Acrylic/plastic emulsion paint of approvedmanufacture of the required shade, conforming to I.S. 5411-1969.

2. Primer: The primer to be used for the painting with acrylic emulsion on cementconcrete surfaces, plastered surfaces, A.C. sheets, timber and metal surfaces, ifnecessary, shall be of approved base and as per recommendations of themanufacturers.

3. Putty: Plaster filler to be used for filling up (putting) uneven surfaces, smallcracks and holes etc. shall be of approved compound and as perrecommendations of the manufacturers.

4. Finishing coats: All the finishing coats shall be of matt finish or any other finishas required by the Engineer-in-charge. The number of finishing coats shall beas specified in the item.

MODE OF MEASUREMENT:All the measurements for payment shall be taken on net surface area actually painted,

unless otherwise specified Deduction will be made from the areas for fixtures, grills,ventilation, outlets, electrical boxes and such obstructions not painted, if they areindividually more than 0.05 sqm.

JOB REQUIREMENTS:i) Acrylic emulsion paint is required to be provided on plastered and concrete

surfaces in portions of the building. The Department shall reserve the options todelete or increase quantities in full or part from the scope of contract duringprogress of work.

ii) All wood surface are to be painted with semi glossy synthetic enamel paint withan approved primer.

iii) All shades and colours of paints shall be subjected to review and prior approval

of Engineer-in-Charge shall be taken before the application.

WHITE WASHING WITH LIME:

Preparation of Surface: Before new work is white washed, the surface shall bethoroughly brushed free from mortar droppings and foreign-matter.

In the case of old work, all loose pieces and scales shall be scrapped off and holes inplaster as well as patches of less than 0.05 sqm area each shall be filled up with mortarof the same mix. Where so specifically ordered by the Engineer-in-charge, the entiresurface of old white wash shall be thoroughly removed by scrapping and this shall bepaid for separately.

Preparation of lime wash: The wash shall be prepared from fresh stone white lime“Katani” or equivalent. The lime shall be thoroughly slaked on the spot, mixed andstirred with sufficient water to make to thin cream. This shall be allowed to stand for aperiod of 24 hours and then shall be screened thoroughly a clean cloth. 40 gm, of gumdissolved in hot water, shall be added to each 10 cubic decimeter of the cream. Theapproximate quantity of water to be added in making the cream will be 5 litres of waterto one kg. of lime.



Section V 39

Indigo (Neel) up to 3 gm, per kg, of lime dissolved in water, shall then be added andwash stirred well. Water shall then be added at the rate of about 5 ltrs. Per kg. of limeto produce a milky solution.The lime shall be tested in a chemical laboratory and test certificate submitted, toconform the quality of lime with regard to its physical and chemical properties. The costof testing lime shall be borne by the contractor.

White washing: The white wash shall be applied with brushes or by spray in thespecified number of coats. The operation for each coat in the case of brush applicationshall consist of a stroke of the brush given from the top downwards, another from thebottom upwards over the first stroke, and similarly one stroke horizontally from the rightand another from the left before it dries.

Each coat shall be allowed to dry before the next one is applied. Further each coatshall be inspected and approved by the Engineer-in-charge before the subsequent coatis applied. No portion of the surface shall be left out initially to be patched up later on.

For the work, three or more coats shall be applied till the surface present a smooth and

uniform finish through which the plaster does not show. The finished dry surface shallnot show any sign of cracking and peeling nor shall it come off readily on the hand whenrubbed.

Protective Measures: Doors, windows, floors, articles of furniture etc. and such partsof the building not to be white washed shall be protected from being splashed upon.Splashings and droppings, if any, shall be removed by the contractor at his own costand the surfaces cleaned. Damages if any to painted surfaces, furnitures or fittings andfixtures etc. shall be recoverable from the contractor.

Measurements: All measurements for payment shall be taken on net surface areasactually white washed, unless otherwise specified. Deductions will be made from the

areas for fixtures, grills, ventilation, outlets, electrical boxes and such obstruction notpainted if they are individually more than 0.05 sqm. length and breadth shall be takencorrect upto two places of decimal of a metre and areas so worked out shall be correctupto two places of decimals of a square metre.

Corrugated surfaces shall be measured flat as fixed and the area so measured shall beincreased by the following percentages to allow for the girthed area.

Corrugated asbestos cement sheets: 20%

Semi-corrugated asbestos cement sheets: 10%

The number of coats of each treatment shall be sated. The item shall include removingnails, making good holes, cracks, patches etc. not exceeding 0.05 sqm. each withmaterials similar in composition to the surface to be prepared.

Rate: The rate shall include the cost of all materials and labour involved in all theoperations described above.

For the work, the priming coat shall be of white wash lime or with whiting as specified inthe description of the item. Two or three coats, shall then be applied as specified on the



Section V 42

The number of coats of each treatment shall be stated in the schedule ofquantities. The whole surface shall be applied with approved putty/filler to getuniform and smooth surface at no extra cost to the Department.

Rates: The rate shall include cost of all materials and labour involved in all theoperation described above.

BEES WAXING OR POLISHING WITH READYMADE WAX POLISH: (NEWWORK):

a) Materials: The polishing shall be done with bees waxing prepared locallyor with ready made wax polish of approved brand and manufacture, asstipulated in the description of item.

b) Where bees waxing is to be prepared locally, the following specificationsfor the same shall apply.Pure bees wax free paraffin or stearing adulterants shall be used. Itsspecific gravity shall be 0.965 to 0.969 and melting point shall be 63 ‘

c) The polish shall be prepared from a mixture of bees wax, linseed oil,

turpentine and varnish in the ratio of 2: 1.5:0.5 by weight.The bees wax and boiled linseed oil shall be heated over a slow fire. When thewax is completely dissolved, the mixture shall be cooled till it is just warm andturpentine and varnish added to it in the required proportions and the entiremixture shall be well stirred.

Preparation of surface: Preparation of surface will be as mentioned here-in-under relevant para with the exception that knotting, holes and cracks shall bestopped with a mixture of fine saw dust formed of the wood being treated, beatenup with sufficient bees wax to enhance cohesion.

Application: The polish shall be applied evenly with a clean soft pad of cottoncloth in such a way that the surface is completely and fully covered. The surfaceit then rubbed continuously for half an hour.

When the surface is quite dry, a second coat shall be applied in the samemanner and rubbed continuously for one hour or until the surface is dry.

The final coat shall then be applied and rubbed for two hours (more if necessary)until the surface has assumed a uniform gloss and is dry showing no sign ofstickiness.

The final polish depends largely on the amount of rubbing which should becontinuous and with uniform pressure, with frequent changes in the direction.

Other details: The specifications for painting (General as mentioned here-in-before shall hold good as for as they are applicable.



Section V 43

FRENCH SPIRIT POLISHING: (ON NEW WORK WITH A COAT OF WOOD FILLER):

Polish: Pure shellac varying from pale orange to lemon yellow colour, free from resin ordirt shall be dissolved in methylated spirit at the rate of 140 gm. Or shellac to 1 litre ofspirit. Suitable pigment shall be added to get the required shade.

Preparation of surface: The surface shall be cleaned. All unevenness shall be rubbeddown smooth with sand paper and well dusted off. Knots if visible shall be covered witha preparation of red lead and glue size laid on while hot. Holes and indentations on thesurface shall be stopped with glaziers putty. The surface shall then be given a coat ofwood filler made by mixing whiting (ground chalk) in methylated spirit at the rate of 1.5kg. of whiting per litre of spirit. The surface shall again be rubbed down perfectlysmooth with glass paper and wiped clean.

Application: The number of coats of polish to be applied shall be as described in theitem.

A pad of woolen cloth covered by fine cloth shall be used to apply the polish. The pad

shall be moistened with the polish and rubbed hard on the wood, in a serious ofoverlapping circles applying the mixture sparingly but uniformly over the entire area togive an even level surface. A trace of linseed oil on the face of the pad facilities thisoperation. The surface shall be allowed to dry and the remaining coats applied in thesame way. To finish off, the pad shall be covered with a fresh piece of clean fine cottoncloth, slightly damped with methylated spirit and rubbed lightly and quickly with circularmotions. The finished surface shall have a uniform texture and high gloss.

Measurement, Rates and other Details: These shall be as for Painting (General)mentioned here-in-before as far as they are applicable.

RESINBASED THERMOPLASTICPAINT (DECORATIVE AND PROTECTIVE FINISH):

Materials: Resin based thermo plastic paint such as Sandtex Matt or other equivalentapproved manufactures, colour and shade shall only be used.

Preparation of Surface & General: The Specifications for Painting (General) describedhere-in-before shall hold good as for as they are applicable.

Protective Coatings: On surface such as ferrous brass, copper and phosphor bronze, aprotective coating of suitable bituminous compound or chromated red oxide should begiven. New wood should be treated with a leafing grade aluminium primer or a waterbased acrylic emulsion primer.

The surfaces with algae growth shall be thoroughly cleaned down to remove as muchgrowth as possible and effective solution of stabilized house hold bleach (calciumhypochloride) pf approved quality with approximate 35% chlorine content @ 2 kgs. Per50 ltrs. (or as per manufacturers recommendations) should be used to treat thesurfaces.

On chalky or friable surfaces after removing the loose materials by stiff brusihg orscraping the surface should be treated with one coat of advanced solvent basedmaterial such as snowsol stabilizing solution or other approved equivalent with whitespirit.



Section V 44

Application: The ready mix Sandtex Matt or other equivalent approved resin basedthermo plastic paint shall be applied on clean and wetted surfaces by means of brushesor roller. The solution shall be kept well stirred during the period of application. Toavoid direct heat of the sub, the paint shall be applied on the side in shade.

On rough and textured surfaces, one under coat of cement based paint such asSnowcem or other equivalent shall be applied before application of undiluted SandtexMatt finish coat. In case of application of two coats of Sandtex Matt at normaltemperatures, the first one shall be diluted by addition of 25% water and the secondcoat direct. In extremely hot environs, the second coat shall be diluted @ 2.5 ltrs. Ofwater to 20 ltrs. of paint or as directed.Painting with resin based thermo plastic paint shall be carried out generally as permanufactures specifications.

Other Details: The specification for Painting (general) mentioned here-in-before shallhold good as far as they are applicable.

Snowsol stabilized solution shall not be applied over bitumen. Snowsol stabilizedsolution treated surfaces shall not be left unpainted for more than 2 (two) days.Gypsum based materials shall not be used for filling of exterior cracks while preparationof surfaces.

Mode of Measurement: The painting unless otherwise mentioned shall be measured byarea in sqm. upto two places of decimal. Length and breadth shall be measured sorrectupto two places of decimal of a meter. Deduction will be made from the areas offixtures, grills, ventilation, outlets individually more than 0.05 sqm.

The item shall include removing nails, making good holes, cracks, patches etc. notexceeding 0.1 sqm. each with materials similar in composition to the surface to be

prepared.

Rate: The rate shall include the cost of all materials and labour involved in all theoperations described above.

Consumption of Paint for Different Painting Items.

Sr.No. Brief Description of painting work Consumption per 10sqm. of net area

1 Oil Bound Distemper on plastered surfaces:a) Cement Primer (one coat) 0.91 Litres.b) Two finishing coats. 1.60 kg.c) Three finishing coats. 2.40 kg.

2 Flat oil paint to plastered surfaces:a) Cement primer (one coat) 0.91 ltr.b) Cement primer (two coats). 1.82 ltrs.c) Two finishing coats. 1.72 ltrs.

3 Acrylic Emulsion Painta) Cement primer (one coat). 0.91 ltf.b) Two finishing coats. 0.87 ltr.c) Three finishing coats. 1.30 ltrs.



Section V 45

Sr.No. Brief Description of painting work Consumption per 10sqm. of net area

4 Cement paint (old surfaces):a)Two coats on sand faced plasteredsurface.

4.10 kg.

b) Two coats on rough cast plasteredsurfaces.

7.70 kg.

5 Cement Paint (New surfaces).a)Two coats on sand faced plasteredsurface.

4.50 kg.

b) Two coats on rough cast plasteredsurfaces.

8.50 kg

6 Enamel Paint to wood/steel:a) Wood primer (one coat) 0.90 ltr.b) Steel primer (one coat) 0.75 ltr.c) Two finishing coats on wood. 1.40 ltrs.d) Two finishing coats on steel. 1.35 ltrs.

7 Flat Oil Paint to wood/steel work:a) Wood primer (one coat) 0.90 ltr.b) Steel primer (one coat) 0.75 ltr.c) Two finishing coats on wood. 0.70 ltrs.d) Two finishing coats on steel. 1.70 ltrs.

8 External Painting with flat oil paint:a) Cement Primer (one coat) 1.00 ltr.b) Two finishing coats. 1.74 ltrs.

9 Repainting old painted surfaces:a) Two coats of emulsion paint 0.86 ltr.b) Two coats of flat oil paint 1.59 ltrs.c)Two coats of enamel paint 1.35 ltrs.

*****

ALUMINIUM FRAME WORK:

SCOPE OF WORK:

The scope of work in the present tender item includes fabrication, supply andinstallation of approved shade anodized matt finished aluminium sections strictly inaccordance with these specifications and relevant detailed approved shop drawings.

GENERAL:The contractor shall submit 4 copies of shop drawings covering all type/details of

work as generally shown in Architectural drawing and envisaged under thesespecifications before manufacture. The drawing shall show all dimensions details ofconstruction, installation of fixtures and relation to adjoining and related works. Nofabrication work shall be undertaken prior to obtaining approval of the shop drawingsfrom the Engineer-in-charge. The tendering shall intimate at the time of tendering thetype of sections he proposes to use on the works.



Section V 46

MATERIALS:

Aluminium alloy for extruded sections for the above work shall correspond to I.S.733-1983 specifications or any further revision thereof (extruded sections shall conformto I.S and shall be anodized before incorporating in the work. The frame work, styles,mullions, beadings, transoms and handles etc. shall be of aluminium anodized sectionsas shown in detailed approved drawings. All aluminium sections shall be of INDAL orother approved equivalent make as per drawings. The contractors can also proposenearest alternative sections they manufacture/posses without changing the elevation,structural stability & functional requirement. Department reserves the right to accept thealternative section or otherwise. The sections shall be structurally suitable to withstandall the loads, the members have to sustain. Counter sunk screws, nuts, bolts, washers,rivers and other miscellaneous fastenings devices shall be of approved brass cadmiumplated or stainless as specified in the approved drawing. Each door leaf shall beprepared to receive glazed panel of required thickness. Glazing shall be done withneoprene dry set glazing gasket (of best quality and approved make) with snap-in-bevelled white anodized matt finish aluminium metal glazing stops inside and outside.All doors shall have off-set pivots; double action (180 o minimum swing) floor springs with

oil check boxes of approved manufacture. All doors shall have approved concealedbrass body mortise lock without handles as per manufacturer’s design, with concealedflush C.P. brass tower bolts provided at suitable locations. All doors shall have pushplates of design shown in the approved drawing as described in the schedule ofquantities. All entrances shall be without thresholds. All aluminum surfaces in contactwith masonry or concrete shall be given a thick coat of bit mastic paint. Afterfabrication, aluminium sections shall be protected from construction hazards that maydamage their appearance or finish. All exposed surfaces of aluminium door entranceshall be protected by masking tape during shipment and erection. All sections andhardware shall have anodic film and cover a minimum thickness of 0.015 mm.

FABRICATION:

The frames shall be manufactured square and flat. The corners of the framebeing fabricated to true right angle. The entire fixed, sliding and opening frame shall beconstructed of sections which have been cut to length, mitered, welded andmechanically fixed at the corners. Where hollow sections are used with welded joints,argon-arc welding or flash butt welding shall be employed (Gas welding or brazing notto be done). In case welded joints are used, anodizing shall be done after fabrication asa whole. All welding shall be on unexposed sides in order to prevent pittings / discolouration of other surface imperfections after fixing etc. Necessary allowance shallbe made while manufacturing the aluminium door entrances wall spans and glazing forreceiving plaster. No field fabrication of frames is permitted. A thick layer of cleartransparent lacquer based on methacrylates or cellulose butyrate shall be applied onthe finished sections of the aluminium work by the contractor to protect the surfacesfrom wet cement, lime, dirt, dust etc. during the construction activities. The size fordoor, window or ventilator frames shall not vary by more than (+/-) 1.5 mm.

HARDWARE:

All cut outs, recesses, mortising or milling and operations required for fixing thehardware shall be accurately made reinforced with packing plate as required to ensureadequate strength of the connection. All the hardware accessories shall be of bestapproved type and of anodized finish same as for the frames and other sections. Each



Section V 51

Department shall be at liberty to inspect the manufacture of tiles even at the factory toascertain whether the manufacture is as per the approved tiles for its quality of materialsand manufacture. Tiles to be used for skirting and dado shall be semipolished beforeplacing in position. Contractor shall submit samples for flooring and skirting tile forapproval of the Engineer-in-charge. The Engineer-in-charge may direct new samplesmade with varying proportions, sizes and colour of terrazzo chips against varying basebefore conveying his decision about the approved samples. No claims will beentertaired for rejected samples. The contractor shall ensure the terrazzo finish as perapproved sample for the entire qty. of tiles, by dry mixing of the cement, marble chips,powder, white cement, pigments etc. in the same proportions. For wearing layer of alltiles, the contractor shall use the cement from one consignment only to ensureuniformity in background colour/shade.

If there is a doubt about the quality of the tiles, they shall be tested from eachconsignment as specified in I.S. 1237-1959 and cost of testing shall be borne by thecontractor. Sample tiles after being approved shall be kept with the Engineer-in-Chargefor reference till the completion of the work. All tiles which are to be incorporated in thework shall strictly conform to the approved samples.

The tiles shall be stored in room or under such cover as will prevent exposure todampness, sun, rain, accidental injury or staining. Tiles to be incorporated in the workshall be immersed in water for a minimum period of 6 hours before use.

BEDDING/BACKING COAT:

In case of flooring, the mortar bedding shall be lime/lime surkhi mortar of specifiedthickness and mix. Proportion of slaked lime surkhi, coarse sand etc. shall be asspecified in the scheduled item. In case of skirting, backing coat shall be of cementmortar of thickness and mix proportion specified in the schedule item. All materials tobe used in lime mortar / lime surkhi / cement mortar shall be got approved by theEngineer-in-charge before incorporating in the work.

CLEANING OF SURFACE & LAYING OF LIME MORTAR BEDDING:

Before laying the lime mortar bedding the concrete floor surface shall be thoroughlyhacked, cleaned of all mortar scales, concrete lumps etc. brushed, washed with water toremove mud, dirt etc. from the surface and shall be thoroughly wetted. Until and unlessthe surface is approved by the Engineer-in-Charge, the flooring shall not be started. Abedding of lime mortar (1:2 of 20 mm thickness or more if required to make up the levelor grade) shall be laid evenly and to the required slopes as directed. The terrazzo tilesshall then be laid on the bedding with cement floating.

All tiles shall be truly and evenly set in a thick slurry of cement applied to the sides andbottom and over the prepared base at the rate of 4.4 kg/sqm. The tiles shall then betamped down with wooden mallet until they are exactly in true plane and line, with theadjacent tiles. Care shall be taken to ensure that the tiles are solidly bedded withoutvoids and air pockets. All tiles shall be extended upto the unplastered surfaces ofmasonry walls/RCC columns/RCC walls. The tiles shall be close jointed in matchingcement slurry and the cement slurry oozing out through the thin joints shall be



Section V 52

immediately wiped clean. The joints between the tiles shall not be greater than 1.5 mm.and shall be kept in straight lines or to suit the required pattern. The junction betweenwall plaster and tile work shall be finished neatly and without any waviness. All tilesshall be laid as to have continuous lines from various rooms to the passage. No changeof lines shall be permitted at junction between rooms and passage. The joints shall befine and made neatly indistinguishable by grouting of the joints in cement slurry mixedwith suitable colouring pigments to match with the tiles. People should not be allowedto walk over the freshly laid tiles.

Adjustment of levels in thickness of mortar bedding due to different type of flooring ifany, shall be done by the contractor within a reasonable limit/distance and directed bythe Engineer-in-Charge without any extra cost to the Department.

CURING, POLISHING & FINISHING

The day after the tiles are laid, all joints shall be cleaned of the grey cement grout with awire brush or trowel to a depth of 5 mm and all dust and loose mortar removed andcleaned. Joints shall then be grouted with grey or white cement mixed with or withoutpigment to match the shade of the topping of the wearing layer of the tiles.

The floor shall then be kept wet for a minimum period of 7 days. The surface shall thereafter be ground evenly with machine fitted with coarse grade grit blocks. (No.60). Watershall be used profusely with grinding. After grinding, the surface shall be thoroughlywashed, remove all grindings, mud cleaned and mopped, and the joints opened outduring grinding shall be grouted once again wherever necessary with matching cement.The surface shall be again cured. The second grinding shall then be carried out withmachine fitted with fine grade grit blocks (No. 120) and shall be grouted again theopened out joints with matching cement.

The final grinding with machine fitted with the finest grade grit blocks (No. 320) shall becarried out the day after the second grinding described in the preceding para or beforehanding over the floor as ordered by the Engineer-in-Charge.For small areas or where circumstances so required, hand polishing may be permittedin lieu of machine polishing after laying, entirely at the discretion of the Engineer-in-Charge. For hand polishing, the following carborundum stone shall be used. Thepolishing shall be done in such a manner that there are no visible scratches on theterrazzo tiles. If scratches are observed, the tiles shall be removed and replaced bynew tiles.

1st Grinding Coarse Grade stone (No. 60)

2nd Grinding Coarse Grade stone (No. 60)

Final Grinding Fine grade stone (No.120)

In all other respects, the process shall be similar as for machine polishing. After thefinal polish, oxalic acid crystals ground into powder shall be dusted over the surface @2/3 1b per 100 sft. or 32.5 gm, per sqm.), sprinkled water and rubbed hard with Namdahblock (pad of woolen rags). The following day the floor shall be wiped with a moist ragand dried with a soft cloth and finished clean. If any tile is disturbed or damaged, it shall



be refitted or replaced, properly jointed and polished. The finished floor shall not soundhollow when tapped with a wooden mallet.

TERRAZZO/CEMENT TILESKIRTING:

Terrazzo tile in skirting shall be of size as specified in schedule of quantities or asdirected by the Engineer-in-charge, hydraulically pressed and shall be obtained from thesame source as for the terrazzo/cement tiles for flooring. The design and shade of theskirting tiles shall be exactly similar to that of flooring tiles. The specifications formaterials and workmanship shall be same as for flooring except that the skirting tileshall be laid against a 12mm. thick backing of cement mortar 1:3 to the full height ofskirting, thus allowing uniform projection beyond the plastered surfaces. In case ofdado, the back to tiles shall be buttered with a coat of grey cement slurry/paste andedges with grey or white cement slurry/paste as the case may be, with or withoutpigment to match the shade of tiles and set in the backing/bedding mortar. Any cuttingof brick work, concrete etc. required due to unevenness of brick surface shall be carriedout at no extra cost to the Department to maintain this uniform projection beyond theplastered surfaces.

The skirting tiles shall be true in plane, line, level and plumb or in slope. The verticallines of skirting tiles should be in line with that of flooring tile lines. The colour of theskirting tile and floor tile shall match. The undone portion of plaster work left above theterrazzo tile skirting work shall be finished round or as directed by the Engineer-in-charge in the matching plaster. The item of plastering shall be inclusive of this plasterfinishing above the skirting tiles, required to be done after laying of skirting tiles. Noadditional payment will be admissible for this extra operation.

MODE OF MEASUREMENT :

The length and/or width of the flooring / skirting / dado shall be measured net between

the faces of skirting or dado or plaster faces of walls which is the proudest, and heightof skirting/ dado shall be measured from the finished level of floor. All openingsexceeding 0.1 sqm. in area where tiling is not done shall be deducted and net areasonly shall be measured and paid for Flooring under dado skirting or plaster shall not bemeasured for payment. Nothing extra shall be paid for use of cut tiles nor for laying thefloor at different levels in the same room.

All dimensions shall be measured correct upto 2 places of decimal of a meter and areaso worked out shall be correct upto two places of decimal of a sqm. For flooring,skirting, dado etc.

Note: Wastage in tile cutting to get the required dimension of rooms etc. as specified indrawing or as directed by the Engineer-in-charge shall have to be taken intoconsideration by contractor while quoting the rate for work to be measured as above.No extra claim on this account will be entertained.

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