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Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public.

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है”ह”ह

IS 6441-1 (1972): Methods of test for autoclaved cellularconcrete products, Part I: Determination of unit weight orbulk density and moisture content [CED 53: Cement MatrixProducts]

IS : 6441 ( Part I ) - 1972

METHODS OF TEST FOR AUTOCLAVED CELLULAR CONCRETE PRODUCTS

PART I DETERMINATION OF UNIT WEIGHT OR BULK DENSITY AND MOISTURE CONTENT

(FourthReprint NOVEMBER1994)

UDC 666.973.6:531.75

Gr2

BUREAU OF INDIAN STAND.ARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

October 1972

Da R. K. CFIO~X ( Alme ) ~%ll?Tcm I CsAdffS \ Central Water 82 Power Cknmissiool, New Delhi

, STAXWM~DS Reww&, &s$ps & Standads Orgattiution

IS t 6441( Part I ) - 1972

( Conlinuedfrom page 1 )

Members Representing

Bara NARE.W PRASAD Engineer-in-Chief’s Branch, Army Headquarters COL J. M. TOLANI ( Alternate )

Pnov G. S. RAMA~WAXY Structural Engineering Research Centre ( CSIB Roorkcc

DR N. S. BHAL ( Alternate ) DR A. V. R. RAO National Buildings Organization, New Delhi

SHRI RAVINDER LAL ( Alter&e ) SHRI G. S. M. RAO Geological Survey of India, Nagpur SHRI T. N. S. RAO Gammon India Ltd, Bombay

SRRI S. R. PINHEIRO ( Alternate ) SECRETARY Central Board of Irrigation & Power, New Delhi SHRI R. P. SHARXA Irrigation & Power Research Institute, Amritsar

SHRI MOHINDER SINQH (Alternate 1 SHRI G. B. SIN~H Hindustan Housing Factory Ltd, New Delhi

SHRI C. L. KASLIWAL ( Alternate ) SHRI J. S. SINQROTA Beas Designs Organization, Nangal Township

SHRI A. M. SINQAL ( Alternate ) SHRI K. A. SU~RAMANIAM India Cements Ltd, Madras

SHRI T. S. RAMACEANDRAN ( Alternate ) SHRI L. SWAROOP

SHRI A. V. RANANA ( Alternate ) Dalmia Cement ( Bharat ) Ltd, New Delhi

SHRI D. AJITHA SIMHA, Director General, IS1 ( Rx-@do Mmber ) Director ( Civ Engg.)

Secretary

SHRI Y. R. TANEJA Deputy Director ( Civ Engg ), IS1

Precast Concrete Products Subcommittee, BDC 2 : 9

Convener

SIXRI M. A. MEETA Members

Concrete Association of India, Bombay

SRRI E. T. ANTIA (Alternate to Shri M. A. Mehta )

SHRI V. A. ARTRANOOR Neyveli Lignite Corporation Ltd, Neyveli SHRI T. RAMA~XAND~AN ( Alternate )

c,

SHRI H, B. CHATTERJEE SHRI S. K. CHATTERJEE

Hindustan Block Manufacturing Co Ltd, Calcutt! Hindustan Housing Factory Ltd, New Delhi

DEPUTY DIREOTOR, STAXDARDS Research, Designs & Standards Organizati (B&S) Lucknow

ASSISTANT DIRECTOR, STAND- dRIx3 ( M/C ) ( Alternate )

DIRE~TQ~.( CSMRS ) Central Water & Power Commission, New Delhi DEPUTY braaCToR ( CSMRS ) ( Alternate )

2

ISt6441(PartI)-l!m

Indian Standard METHODS OF TEST FOR AUTOCLAVED

CELLULAR CONCRETE PRODUCTS PART I DETERMINATION OF UNIT WEIGHT OR BULK

DENSITY AND MOISTURE CONTENT

0. FOREWORD

,l This Indian Standard ( Part I) was adopted by the Indian Standards nstitution on 21 February 1972, after the draft finalized by the Cement nd Concrete Sectional Committee had been approved by the Civil ,ngineering Division Council.

.2 Autoclaved cellular concrete is a class of material, which has been eveloped commercially abroad and is in the process of development in nis country also. A series of Indian Standards on cellular concrete is leing formulated so as to provide guidance in obtaining reliable products 1 autoclaved cellular concrete. The Sectional Committee has considered t desirable to issue a standard for the methods of test for autoclaved :ellular concrete products for the guidance of manufacturers and users.

1.3 In the formulation of this standard due weightage has been given to nternational co-ordination among the standards and practices prevailing n different countries ,in addition to relating it to the practices in the field n this country.

1.4 For convenience of reference, ‘Indian Standard methods of test for rutoclaved cellular concrete products ’ has been grouped into the following line parts:

Part I

Part II

Part III Part IV

Part V Part VI

Determination of unit weight or bulk density and moisture content Determination of drying shrinkage Determination of thermal conductivity

Corrosion protection of steel reinforcement in autoclaved c.ellular concrete Determination of compressive strength

Strength, deformation and cracking of flexural members aub,ject to bending-short duration loading test

3

Parfz VII Streng& d!4dbmatioa 2nd cracking of fiexural members subjeeatobendimlg~loadingtest

Part VIII Loading tests for flexural members in diagonal. tension

Part IX Jointing of autoclaved cellular concrete elements

0.5 In reporting the result of a test made in accordance with this standard, if the &al v&uq observed or calculated, is tu be rounded off, it shall be done in accordance with IS : Z-MO*.

1.1 This standard ( Part I ) covers the methods c -letermining the followingz

a) Unit weight or bulk density of autoclaveu cellular concrete products, determined as the ratio between the weight of the specimen after drying at 105°C and volume of the specimen; and

b) Moisture content of autoclaved cellular concrete products.

2. TEST SPECLh&ENS

2.1 Slwspe rf S-ens- The bulk density and moisture content shall be determined on regularly shaped specimens ( without reinforcement) with a minimum thickness of 50 mm. The two large sx.trj~~~ of the specimen located opposite each other shall have a surface ares r’ &least 2OQOOmm~each and the Iength of the edge shall not be less than 1.00 mm.

. NOTE I-Aspeeimen of size 100 x 200 x 50 mm will meet the above require-

meats. NO’iE 2 - Wbencycr feasible, the specimens used for determinatioii of bulk

density and moi&uro eontent, and the specimen for determination of compressive strength should.be cut from the same sample of cellular concrete product.

2.2 Locntian of S#meisa?.ens - From eac’.l sample for which the density is to be determined, three test specimens shall be taken, and these shall form the test series. One specimen shall be taken from the upper third of the sample, one from the middle and one from the lower section. The position of the specimen is with reference to the direction of rise in aerated concrete mass during manufacture.

2.21 It is permissible to prepare the specimens from items which have previously been used for other tests provided the specimens are not cut within a distance of atleast 15 cm from an area where visible damage or changes in the normal structure and appearance have occurred. The specnnens shall not contain any reinforcement.

‘Wnlrs for rounding off numerical values ( rc~isa$ j.

z blades or bimiiar device; of Swns - The specimens shall be cut by rotat-

All surfaces shall be clean cut ti plane. The largest surface shall not deviate from planeness by more &an O-1 mm, if measured diagonally with a straight-edge.

5 APPARATUS

3.1

3.2

3.3

3.4

Straight-Edge - approximately 500 mm long.

Cniliper - allows readings to an accuracy of 0-l mm.

Dqing Oven - for a temperature of 105 +. 5°C.

B&nce - with a weighing accuracy of 0.5 g.

4. PROCEDURE

Al Bdlc Density

41.1 Measuremetlt of Specimens - Length, width and thickness shall be measured before drying at 105°C with an accuracy of 0.1 mm using a suitable calliper. These measurements shall permit the determination of the volume V of the specimen with an error not exceeding one percent.

4.1.2 Dryit of Sflcz’nlens - After measuring, the specimens shall be placed in a.cl.rying oven at 105 4 5°C until all moisture has been removed and coristant weiiht is obtained. Immediately after removing from the drying oven, the specimens shall. be weighed ( see Note ). The weighing error shall not exceed 0.1 percent of the weight of the specimen. The weight W of the specimen shall be considered constant if the weight after four hours further dr$ing has not changed more than 0.2 percent.

NUTJG - To facilitate hndling, the specimen after removal from the oven, nu! lx- cooled to room tcmperaturr in a suitable desiccator and weighed immediateI).

4.2 Moisture Content

4.2.1 Weigkg of Specitnerls - The specimen as in 4.1.1 ( or immediately nfter loading, .in case the moisture content is to be determined for corn-- pressive strength specimens ( see 1.1 and 2.1 ), shall be weighed. The weighing error shall not exceed O-1 percent. This weight shall be designated WI.

4.2.2 After weighing, the specimen shall be dried out at 105 f 5°C as ill 4.1.2 until constant weight is obtained within a duration of four hours.

5 .y . .

IS: 6441 j Part I ) - 1972

Immediately after removing from the drying oven, the specimen shall be weighed ( if necessary by cooling to room temperature in a suitable desiccator ), and weight W obtained as in 4.1.2.

5. CALCULATIONS

5.1 The bulk density y in g/cm” shall be calculated as follows: -. W

Y = r(g/cm3)

where

W = dry weight of the specimen in g, and

v = volume in ems.

5.1.1 Bulk density of the individual specimens shall be calculated and reported within the three decimal places, the mean value of the three specimens shall be within two decimal places.

5.2 Moisture content F in weight, percent of the dry material, shall be determined as follows:

F = w, -- w -.___ W

X 100 ( percent )

where

WI = sampled weight of the specimen in g,

W = dry weight of the specimen in g.

and

5.2.1 Moisture content of individual specimen shall be stated in whole percent, and the mean value of three specimens shall also be stated in whole percent.

6. REPORT

6.1 The

a)

b) c)

d)

e) f)

report shall include the following:

Code designation;

Identification of product; Date of manufacture;

Place, method and time of sampling;

Bulk density of each specimen and mean value of test series; and

( CdfifJm pags 2 )

Members QHRI K. C. GHOSAL Alok

SHRI A. K. BISWAS ( Al!crnnfe j SEBI M. K. GUPTA Him SHRI B. D. JAYARAMAN Stat1 SRRI B. K. JINDAL Cent

DR S. S. RERSI ( Altcmale ) SHRI L. c. LA1 In PI SERI G. C. MATHUR Nati

ASSISTANT DIRECTOR ( DESIGNS ) ( A/ SRRI S. NAHAROY Engi

SHRI A. RABIAKRISHNA ( Alternate ) SHRI K. K. NAMBIAR In

SERI RADHEY SHIAM Engi SERI B. G. SHIRKE B. G

SERI R. A. DESHMUKR ( rllfernnte ) SHRI C. N. SRINIVASAN C. R

SHRI C. N. RAQHAVENDRAN ( Alternate SUBVEYOR OF WORKS ( I ) Cent DR H. C. VISVESVARAYA Cemf

IS:6441 (Part I)-lM2

cfmtinl&uffam pags 2 )

Manbars hp6J&Sg

~IRI K. C. GHOXJAL Alokudyog Services Ltd, New Delhi SHRI A. K. BIEWAS ( Altcrnatc )

SERI M. K. GUPTA Himalayan Tiles & Marble Pvt Ltd, Bombay SH~IB.D. JAYARAMAN State Housing Board, Madras SERI B. K. JINDAL Central Building Rbearch Institute ( CSIR ),

Roorkee DR S.S. REIISI (Alternate)

&ilUL.C.LAl In personal capacity ( B/17, West End, &a Delhi 23 ) S-1 G. C. MAT~UR National Buildings Organization, New Delhi

ASSISTANT DIRECTOR ( DESIGNS ) ( Alternate ) SFXRI S. NAHAROY Engineering Construction Corporation Ltd, Madras

Soar A. RAYAKRIHINA ( Alternate) SHRI K. K. NAIUBIAR In personal capacity ( ‘ Ramanalaya’, II First

Crescent Park Road, Gandhinagar, A&ar, Madras ) SERI RADEEY SEIAM Engineer-in-Chief’s Branch, Army Headquarters SHRI B. G. SltrmXE B. G. Shirke & Co, Poona

SHRI R. A. DESEMUKH ( Alternate ) SHRI C. N. SRINIVAEIAN C. R. Narayana Rao, Madras

SHRI C. N. RAGHAVENDRAN ( Alternate ) %JBVEYOROF~ORKS (I) Central Public Works Department DR H. C. VISVESVA~AYA Cement Research Institute of India, New Delhi

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