ITEM 304 BITUMINOUSSURFACETREATMENTANDSEALCOAT./PAD COAT

DESCRIPTION

This work shall consist of one or more applications of asphaltic material and

o n e . o r m o r e c o v e r s o f a g g r e g a t e s o r a n a p p l i c a t i o n o f a s p h a | t i c m a t e r i a i*iinort ajgregates apptijO'in accordance with these specifications and ir'

contormit!-with tne lines and width shown on the typical cross-sections or as

established bY the Engineer.

MATERIAL REOUIREMENTS

Aggregate

Aggregate shall csnsist of clean, dry, hard, durable, toUgh, Algqlql goqnq

crushed stone or crushed gravel of uniform quality, and free from dirt, clay

anJ otner objectionable iratter. Aggregates from only the sources of

established adhesion properties would be used. The percentage of wea" lt:/

the Los Angeles Abrasion test (AASHTO T-96) shall not be more than fc':tv

(40). Aggregate crushing value (ACV) .when tested as per BS-812 (1990)

inatt niie"ieed 25%. filnen subjected to five (5) cycles of sodium-sulfate

soundness testing as determinedby AASHTO T-104, it shall have a weight

loss of not greater than ten (10) percent. The moisture content in the

aggregate ap-ptieO directly to the lirrfqce of the bituminous material shall not

"iJ"""O tnreb'1a1 p"r"eni by weight plus one-half (112) the water absorption

of the aggregate at the time of dllivery to the Project. !n no case shall free

moisture be drawing from the truck bed'

T h e p o r t i o n o f a g g r e g a t e r e t a i n e d o n t h e g . 5 m m ( 3 / 8 i n c h ) s i e v e s h a | | n o tcontain more thln f-ifte"n (15) percent of particles by weight of flat or

etongateO, or both, that the'ratio between the maximum and the minimum

diminsions exceeds 2.5:1. Flakiness lndex, tested under BS-812 (1990) part

1 0 5 , s h a | | b e 2 5 ( m a x ) f o r n o m i n a l s i z e l 8 m m a n d l 2 m m a n d 3 0 ( m a x ) f o rnominal size 9mm.

The nominal sizes of aggregates used for surface treatment; shown against

table 304-1 shallbe as under:

Size No. 1 - Nominalsize 18 mmSize No. 2 - .Nominalsize 12 mmSize No .3 - Nominal size 9 mmSize No. 4 - Nominal size 6 mm

304.1

304.2

304.2.1

The nominalsize are Oefrned in the table beSpecified Size *

Nomina lS ize(mm)

PassLn_g_ Retained

Sieve (mm) o/o?!e Sieve (mm) o/o?ga

1B 1 9 100 12.5 85i 2 12 .5 100 9.5 85

I 9.5 100 6.3 B5

6 6.3 100 4.75 85. rial within the resPective

SIEVES.304-1

For Material passing 3/8" Sieve, following Table shall be used:

304.2.2 Asphaltic Material

The asphaltic material shall conform to the requirements of ltem 301'Asphaltic Materials'. The type shall be one of the following, as ihown in theBill of Quantities or ordered by the Engineer. spraying teriperaiure shall beas shown against each type.

able T atures for Surface TreatmentsAsphalt Type / Grade Spraying Temperature

Surface Treatmentsa. Asphatt UementsAC-2.5 130 min.AC-5 '140 mn.AC-10 140 mn.AC-20 145 min .AC-40 150 min.AR-1000 155 min .AR-2000 140 min.AR-4000 145 min.AR-BOOO 145 min.AR-16000200-300 pen. 130 min.120-150 pen. 130 min.85-100 pen. 140 min.60-70 pen. 145 min .40-50 pen. 150 min.p. Emutsttted AsphaltsRS-1 20-60RS-2 50-85MS-1 20-70MS-2MS-2hHFMS-1 20-70HFMS-2FIFMS-2h

HFMS-2sSS-1S S . 1 hCRS-1 50-85CRS-2 50-85CMS-2cMS-2hCSS-1C S S - 1 h

3442.

304.3

304.3.1

3043.2

304.3.3

Asphalt Type / Grade Spraying TemperatureSurface Treatments

Cutback Asphalts (RC, MC, SC)30 (MC onlv) 30 min.70 50 min.250 75 min .800 95 min.3000 110 m in .

CONSTRUCTION REOUIREMENTS

At the time of the application, the weather shall be warm and dry, and theroad surface shall be clean and dry. Spraying shall not be done unless theroad temperature is above twenty (20) degree C for at least one hour prior tothe commencement of-spraying operations, and the lernperature shall not beless than twenty (20) degree C during the spraying. Prior to applying theasphaltic material, dirl and other objectionable materials shall be removedfrom the surface and surface shall be primed as per item 302. lf so directedby the Engineer, the surface shall be cleaned by power brooming or wirebrush until all loose and foreign materials are removed.

Equipment

Equipment shall conform in all respects to the provisions under ltem 302.3.1.The equipment shall be operated by the manpower specially trained for thiswork. Necessary safety arrangement for the workers, equipment and trafficshall be ensured during the operations.

Preparation ofSurface

lrregularities and surface damage e.g. potholes, depressions, raveling, shallbe corrected prior to surface dressing. The Engineer shall also satisfyhimself that fundamental pavement defects e.g. base failure, drainageproblems etc. have been remedied before surface dressing is attempted.Areas, which are excessively rich in bitumen e.g. 'bleeding', shall be cut outand patched. All patches, however, occasioned shall be thoroughlycompacted, sealed and blinded with crusher dust before opening to traffic forseveral days before surface dressing commences.

lmmediately prior to the application of binder all dirt, dust are foreign materialshall be removed by thorough brooming and / or the use of compressed air.Adhering mud or other soiling may be removed using water and brushes, thegeneral use of water to wash the road shall not be permitted.

Application of Asphaltic Materials

Asphalt cement, liquid asphalt and emulsified asphalt shall be applied bymeans of pressure distributor manual or automatic at the temperaturespecified for the type and grade of asphalt being used. The rates ofapplication shall be within the ranges given in Table 304-1.

304-3

v-v0t,

poupads sa'uer oL* urrilr^ aq rerrs parrdde aq o] sale6ar66" ri lfli;ll "ttt'asBInS Oql uotj po^oulel

eq [eq:.abeJJrds l le-pue papto^e aq l leqs leuo]Br! ta^oc lo suorlecr;ddeaq1 ourddepa^o 'saprLla^

lo slaaLm ol aroqpe lou saop pue 'sllnsar ocernsuena ue lrlun pabbelpuooJq pue pellor reqynl pue a1e6e:66e leuoryppetllm paJanoc aq lleqs ecefns aql uo smoqs laputq ajaqm acegd Iuy

'palrqrqo:d oq saslnoc leas aLllo1 aoeuep-Jo leualeu ranoc all] lo ]uoruoceldsrp ur s]lnsoJ'r.lcrqM luerudrnbJ;o ecerd {ue 1o 6uru:n1 .ro ,burddols ,6urpe1s

}o selnpacoJd paute}qos! oce1.tns palceduoc IgqOno:oq1 ,L{}oouls e lt}un ,iluo anurluoc lleqs9utttgu

'railor puocas e se pasn oq {etr suol (gj lq6te o1 (g) xrs uoa/\^loqburqbrervr Jailor poroaLr^ -raors v

'Jalourluec e.renosT'6) g:;' 1o ernsserd]cBluoc ulnuturrrJ e 6uneq la1;o: a:Iycrleutnaud pelledold_1|as e qym pa1lotaq lleqs aceJJns paleojl eq1 'e1e6ar66e aql 10 ourpeerds Jaue {le1erpeutrl

'burr{elds raye salnurur (67){1uaaq }o ssocxa ur pouad e Jo} palenocun uteuloJ lleqs Japutq aq11o uoryodo1r1 'l leqdse paferds {pneu eq1 uo r;lcarrp Ournup uro4 ropeoros ite6aio6elesruBr{3aur aLl} pue )3ru1 oll} 10 seil1 eql luanerd ol se os ,oues spea:dslr se pJe/v\)ceq a^orrJ l1eqs a1e6er66e aql ourfurec rcrut aqr .raeur6u3gql fq peno.rdde suBaul raqlo r{ue ro repeards e1e6a.r66e'-lecruer..l3or!penordde uB_rIloJJ acelns paleoJl eql JaAo palnqulstp r{1uane pue {;ur.ro;runaq llBrls a1e6a.r66e fup ';eueleur crlleqdse aq1 bur^ldde reye ,(1a1erpeurul

@

'paunsal st uotlnqlJlsrp ololaq uo)el oq llBrlssaJnseeut a^tlcalloc pue aEzou r{ue 1o asueJola}ut to 6ur66o;c rue uodnr{lalerpaurur aseoc lleqs uollnqutslp oqt 'parnsua sr uor}nqulsrp uJJoJrun }eq}polcaLlc rtJluenba4 pue pelsnlpp os aq lleLls lBq {e.rds eq1 1o iqotaLl eq1 puesalzzou felds eq11o a16ue eq1 'ebera^oc uonaun 6ursnec-rqa:aLll leueleursnourunltq oq] ql!/v\ :le ;adxe ol pamolle aq rolnqulstp oq) lleqs osec ou ul'leHaletu snouttunltq lo uotlnqulslp LlJolun e aq.'il/'^ eio4 l€ql os .ublle-rJddEqcPo ]o pua oLll le Jolnqulsrp alll u! ual letJaleu snoutulnltq luotetJJnspue pelelnbal os oq lleqs letJaleu snoululnllq aql lo uotlnqulsl6 ,t-ervrpalone4 oLl] Jo acelns oq] uo leueleu snoutunltq dup 1ou llm lustueqcoutro Jeq r{erds eql }eq1 paubrsep os aq 11eqs burpeards 1ou ueqnn')o1nqr,r}slp aqI

'JBoc Jonoc aql ]o uotluole: lredu.rr ostmJoqlo ro ,fup ,dnlas 'l lrrlc ol pomolle oq ll$ leueleu snoutunltq lpql Jouueur L{cns ut paaco:dsuorlelado lleLls sacuelsuncJtc ou lapun 'Ja^oc r;elerpauwr uec letJaleuleoc Ja^oc qlm papeol slcnJ] qctqM leLll uetll paosxo lou lleqs leuoleu.lsnourunltq ;o pee:ds 10 q16ua1 oq|aceJJns 6urpu q100rus B arnsse ol apeurI|;nla.rec oq lleLls spealds Jo suollcunf .:euueu pbno.rdde ue ut palca,,ocoq ller.1s satcuatct;op Jo seale peddlys Auy 'peuedo st leq Ields aq1aurl aql 1e peads uorlecl;dde :edold le pleruo1 6urnou.r aq llBt.ls lolnqulstpaql 'acr^op burpeerds aLll rxor1 e1eba.r66e eql Iq paJa^oo oq ol L.llptm oLllueql arou rxo (0t) ual lseel le oq lleqs sletraleu snoutunltq 1o pea.rds eq1

v'e'vOe

304.3.5

304.3.6

304.3.7

304.3.8

Maintenance of Traffic

Detouring of highway traffic for this work on running road will not be provided

for or peimitted, except when authorized by the Engineer' All construction

operations shall be coordinated to result in the least practicable delay of

trattic. One way traffic shall be maintained and traffic speeds restricted to

fifteen (15) Km per hour. The contractor shall provide flagmen, warningsigns, bariicades, and a sufficient number of pilot cars to control traffic

thiough the bituminous sealing operations when so directed by the Engineer.pilot cars shall be used to lead the traffic through the areas of all distributionand sealing operations. Pilot cars shall be light "Pick up" trucks or other

approved vbhicles and shall be equipped with signs reading "PILOT

CAR - DO NOT PASS" in both English and Urdu languages' Two (2) signs

shall be mounted on the vehicles so as to be clearly visible from both

direetisns, One (1) flagman shall be stationed immediately ahead Sf theapplication of the bituminous material and one (1) flagman immediatelybehind the section being rolled. Suilable speed limit signs shall bedisplayed, and the signs shall move forward with the flagman as the workprogresses.

No separate payment shall be made for conformance to this paragraph. All

these items beihg considered subsidiary to the item (s) given in the Bill of

Quantities.

Workins Period

All work shall be so conducted that the work of applying asphalt and

aggregate and of all rolling shall be completed during the time from sunrise

to sunset and under favorable weather conditions aS determined by the

Engineer.

Maintenance of comPleted work

when directed by the Engineer, the contractor will be required to add

bituminous material or aggregate or both to the portion of road identified forsuch purpose on the project. Furnishing additional bituminous material and

furnishing, spreading, dragging and rolling of additional aggregate will not bepaid for separately but will be considered as subsidiary work pertaining to therelevant item of "Bituminous Surface Treatment"'

Opening to Traffic and after-care

There shall be no delay in opening a completed surface dressing to traffic a,ta controlled speed. Prior to opening to traffic any spillage of aggregates shallbe removed and any binder drips or wind blown contamination shall be

dusted with crusher waste. After 2-3 days under traffic, excess stone will beremoved by brushing.

Pad Coat

To ensure chipping retention when surface dressing a very hard surface, apad coat consisting of application of an initial binder spray followed by 6 mm.chipping will be applied. After stabilizing of pad coat under traffic, theappropriate surface dressing will be applied.

304.3.9

304.5

304.4

304.4.1

304.4.2

MEASUREMENT AND PAYMENT

Measurement

The quantity of surface treatment to be paid for shall be measured in squaremeter within the theoretical line in place as shown on drawing. No allowancewill be given for material placed outside the theoretical limits of finishedsurfacing whether placed for, due to requirement of contractor's operationsor placed out side the limits due to inadequate control.

Payment

The aggregate and asphaltic material measured as stated above shall bepaid for at the contract unit price per square meter for a particular item listedbelow and shown on the bill of quantities, which payment shall be fullcoqlpglsetion_ Iq fuittrsflQg a!! labour, materiats, tooJs equipment andincidental for performing all the work in the construction of bituminoussurface treatment or seal coat complete in place and according tospecification, including priming of surface.

Pay ltem DescriptionNo.

Unit ofMeasurement

304 a Single Surface Treatment

304 b Double surface Treatment

304 c Triple Surface Treatment

304 d Seal Coat / Pad Coat

SM

SM

SM

SM

304-6

Notes:-

TABLE 304-1

Ouantities of Materials for Bituminous Surface Treatments

Bituminous material types are (a) asphalt cement, (b) cut-back or emulsifiedand (c) asphalt cement, cut-back and emulsified.

Quantities of bituminous material may be varied by the Engineer by 115%depending on site conditions.

Prime coat shall be applied prior to the surface treatment for the newlyconstructed pavement at the rate as specified in the item 302.3.2.

i i i )

Surface Treatment Aggregate Bituminous Material

Type Application Size No. Quantity Kg./Sq.M

Quantity Litres/ Sq.M

Type

Single Single z 1 2 . 51 . 1 9 (a)

1 . 6 3 (b)

DoubleFirst I

I 24.0(a)

2 . 1 4 (b)

Second 3 1 2 . 51 . 1 9 (a)

1 .63 (b)

Tripple

First 1 24.01 .90 (a)

2 .14 (b)

Second 2 12.51 .19 (a)

1 .63 (b)

Third 3 6 . 5 0.68 (c)

Seal Coat / Pad Coat withAggregate

4 4 0.5 (c)

304-7