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Indian Standard

METHODS OF PHYSTCAL TESTS FORHYDRAULIC CEMENT

PART 6 DETERMINATION OF COHPRESSIYE STRENGTH OF HYDRAULICCET.IENT OTHER THAN I{ASONRY CEMENT

(Wn r"tg)Second f.eprint NOVEMBER 1996

UDC 666'94:. 539'1ll

BUREAU OFMANAK BHAVAN.

@ Copyright 1988

INDIAN STANDARDS9 BATIADUR SHAH ZAFAR MARG

Ctr 2

NEW DELHI I1OOO2

August 1988

l S : r l 0 3 l ( P a r t 6 ) - f 9 8 E

Indian Standard

METHODS OF PHYSICAL TESTS FORHYDRAULIC CEMENT

PART 6 DETERHINATION OF COMPRESSIVE STRENGTH € ,F HYDRAULICCEMENT OTHER THAN MASONRY CEMENT

( First Revision )O. FOREWORD

0.1 This Indian Standard ( Part 6 ) ( FirstRevision ) was adopted by the Bureau of IndianStandards on l0 March 1988, after the draftfinalized bv the Cement and CoDcrete SectionalCommitte6 had be en approved by the CivilEngineering Division Council.

0.2 Standard methods of testing cemetrt areessential adiunct to the cement sPecifications.This standald in different parts lays down theDrocedure for the tests to evaluatc the physicalprooerties of different types of lrydraulic cemenls.Thd procedure for conducting chemical tests ofhvdraul ic cemenl is covered in IS :4032-1985*.

O.l Or;ginatty all the tests to evaluate the physicalprooerties of hydraulic cements were covered inone^standard but for faci l i tat ing the use of th isstandard and future revisions, it has been decidedto Drint the different tests as different parts of thestai:dard and, accordingly this revi sed standardhas been brought out in thirleen parts. This willalso facilitatc updating of individual tcsts.Further, since publication of the original standardin 1958, a number of standards covering the

1. SCOPE1.1 This standard ( Part 6 ) covers the proccdurefor determining the strength of cement as iepre-sented by compressive strength tests on mortarcubes corirpacted by means of standard vibrationmachine.2, SAMPLING ANDSELECTION OFTEST

SPECIMEN2.1 The samples of the cement shall be taken inaccordance with the requirements of lS: 3535-1986* and the relevant standard specification forrhe type of cement beitg tested. The representa-tive

'aamDle of the cement selected as above

shall be thoroughly mixed before testing.

requir€m€nts of different equip$€nt uscd fortesting of cement, a brief description of which wasalso covered in the standard, had been published.In this revision, therefore, refereoce is given todifferent instrument specifi.cations deleting thedescription of the instruments, as it has beenrecognized that reproducible and repeatable testresults can be obtained only with standard testingequipment capable of giving desired level oTaccuracy. This part covers the metbod fordetermining the compressive strelgth of hydrauliccement other than masonry cement which iscovered in Part 7 of this standard. The criteriafcr accepting compressive strength values hasbcen incorporaled a_n{ the use. of single gradedsand has been deleted in this revision.0,4 For the purpose of deciding whether a parti-cular requirement of this standard is conpliedwith, the final value, observed or calcuiated.expressing the result of a test or analysis, shallbe rounded off in accordance with IS : 2 - 1950*.The number of significant places retained in therounded off value should be the same as that ofthe specified vglue in this standard.

rM€thod of chcmicd analyris of hydrarilic ceoent( fir st retision ).

+Rules for rounding off numerical valres ( rcttEed ),

3. TEMPERATURE AND HUMIDITY3.1 The temperaturc of moulding room, drymaterials and water shall be maintained at 27 i2"C. The relative humidity of the laborato-rvshall be 65 :t 5 percent.

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3.2 The moist closet or moist room shalt bemaintained at 21 t 2"C and at a relative humi-dity of not less than 90 percent.4. GENENALd.l $tandard Sand -The standard sand to beused in the test shall conform to IS : 650-1966*.5. APPARATUS5.1 Vibration Machine - Vibration machine

+Methods of sampling hydraulic cement (/irs, _ rSpecification for standard saod for tetting of ccmbor

retision l. ( first rcvision l.

tS :d031 (F . r l t6 ) - rgEE

conforming to lS : 10080-1982'.

5.2 Poking Rod - Poking rod conforming tolS : 10080- i982t .5.3 Cube Mould - The mould shall be of 70'6mm size conforming to IS : 10080-1982*.5.{ Gauging Trowel -- Gauging trowel shallhave a steel blade 100 to 150 mm in lengthwir h straight edges weighing 21 0 f l0 g.5.5 Brlaace -The balance shall conform to thefollowing requirements :

On balance in use, the permissible variationat a load of I 000 g shal l be A l '0g.The permissible variation on trew balanCeshall' be one-half ol this value. Thesensibility reciprocal shall be not greater thantwicc the permissible variation.

Noru I -The senribil ity reciprocal ir generallydefncd a8 tho change in load requircd to changc thcposirion of rcat of the indicating clcmcnt or clementgal a non-automalic indicating scelc a defiDitcamount of any load.

No'r'r 2 - Self-indicating balancc with equivalentaccuracy may also be used.

5.6 Standard Weights - The permissible vari-ation on weights in use in weighing the cem€ntt

TAEI,E I PERMISSIBLE VARIATIONSON WEIG! TS

PrrwrggrrLr VAg'raqoN olrWnrosrs rrs Ugr

(2)(s)

+0'35+0'30+0'45+0'2oif l5+0'10*o{)5+r(x+om+o'02+0ol

and the temperature of water and that of the testroom at the time when the abovc operations arebeing performed shall be 27 l.2C, Potable/distilled water shall be used in preparing thecubes.

6.1.2 The material for each cube shall be mixedseparately and the quantity ofcement, standardsand and water shall be as l.rllows :

Cement 200 gStandard 600 g

Sandl P \

Wa te r (7 + I O ; pe rcen t o f

combined mass of cement andsand, whether P is the per-centage of water required toproduce a paste of standardconsistency determined asdescribed in IS : 4031 ( Parr4 ) - 1988* .

6.1.3 Placc on a nonporous plate, a mixture ofcement and standard sand. Mix i t drv wi th atrowel for one minute and rhen with water untilthe mixture is of uniform colour, The quantityof water to be used shall be as specified ft 6.1.i.The time of mixing shall in any lvent be not lessthan 3 min and should rhe t ime taken to obtaina uniform colour exceed 4 min, the mixture shallF rejectpA and the operation repeaied with afresb quantity of cementl sand and *atcr.6.2 Moulding Spc,'i'ncncr

6.2.1_ Irl_ assembling the moulds ready for use,covcr the joints between the halves of the mouldwith. a thin. film of perroleum jelly and apply aslmttar coartDg of petroleum jelly betwecn thecontact surfac€s of thc bottom of ihe mould andits base plate in order to ensure that no wateroscapes during vibration. Treat the intcrior faccsof the mould with a thin coating of mould oil.

6,2.2 Place the assembled mould on thc tableof the vibration machine and hold it firmly inposition by means of a suitsble clamp. Atta6h ahopper oF suitable size and shape seiurelv at thetop of the mould to facilitati filling and thishopper shall not be removed until the completionof the vibration period.

6.2.3 Immedialely after mixing the mortar inaccordance with 6.1, place the mortar in the cubemould and prod with the rod specified in 5.2The mortar shall be prodded 20 timis in about 8 sto ensure elimination of entrained air and honev-combing. Place the remaining quatrtity i,tmortar in the hopper of the cube mould and prodagain as specified for the first layer and thencompact the mortar by vibration.

6.2.4 The period of vibration shall be twomrnutes at the. specified speed of 12 Ofi) * 400vrbfatlon per minute.

_ .lvr"tfroas of ptvsical tests for hydraulic cemeDt: part 4Dctermination of consirtency of dandard clmcnt paste( flrst rolslon ).

-

WrroET

( l )(c)

5003m2fiz)010050ml05

I

5,7 Graduatod Glass Cyliadere - Graduatedglass cylinders of 150 to 200 ml capacity. Theperuiissible variation on these cylinders shall be* I ml. The main graduation lines of the cylin-ders shall be in circles and shall bc numbered.The least graduations shall extend at least one-seventh of the way around, and iutermediatc gra-duations shall extend at least one-fifth of thc tavarouDd thc cylinder. The graduation lines maybe omltted for the lowest 5 rnl.

6. PREPARATTON OF TEST SPECTMENS

6.1 Mir Proportions and Miring

6.1.1 Clean appliances shall be used for.Spcci0cation tor vibretion machinc for calting stsndard

c€flrcnt mortar cubcr.

mrxlnS

AMENDMENT NO.1 MARCH 1993TO

IS 4031 ( Part 6 ) : 1988 METHODS OF PHYSICALTESTS FOR HYDRAULIC CEMENT

PART6 DETERMINATION OF COMPRESSIVESTRENGTH OFHYDRAULIC CEMENT OTHER THAN MASONRY CEMENT

( First Revision )

(Page2, clause 5.4)- Subsriture rhe following for the existing clause:'5.4 Gauging Trowel - Gauging trowel conforming to IS 10086 : 19821.'

( Page 2, foot-note ) - Insert the following fooi-note at the end:'tSoecification for moulds for uso in tess of cement and concrete.'

( cED2)Prioted at Dee Kay Printers, New Delhi_ l l@15. India.

6.2.5 At the end of vibration, remove themould togeth€r with the base plate from themachine and finish the top surface of the cube inthe mould by smoothing the surface with thcbladc of a irowel.

63 Curing Speci."ena -- Keep the 6lled mouldsrn moist closet or moist room for 24 hours aftercompletion of vibration. At the end of thatperiod, remove them from the moulds andimmediately submergc in clean fresh water andkeep there until taken out just prior to breaking.The water in which the cubes are submerged shallbe renewed every 7 days and shall be maintainedat a temperature of 27 + 2'C. After they havebeen taken out and until they are broken, thecubes shall not be aliowed to become dry.7. TESTING

?"1 Test three cubcs for compressive strength foreach period of curing mentioned under th1 rele-vant specifications for different hydraulic cements,the periods being reckoned from the completionof vibration.

I S : 4 0 3 1 ( P e r t 6 ) - 1 9 S S

7.1.1 The cubes shall be tested on their sideswitltout rny packing between the cube and thesteel plattens ofthe testing machine. One of theplr t tcns shir l l be carr ied on a base and shal l beself-ad-itrsting, and the load shall be steadity anduniformlv applied, starting from zero at a raie of35 N/mm'z/min.

8. CALCULATION

8.1 The measured compressive strength of thecubcs shall be calculated by dividing the maxi-mum load applied to the cubes during the test bylhc cross-sectional area, calculated from the meandimensions of the section and shall be expressedto the nearest 0'5 N/m6'?. In determining thecomprcssive strength, do not consider speciirensthat are manifesl ly faul ty, or t l ra l g ive strengthsdi f fer ing by more than l0 percenl l rom theaverage value of all the test specimens. Afterdiscarciing specimens or strength values, if lessthan two strength values are left for determiningthe compressive strength at any given period, aretest shall be made.

Ilureau of Indian Standards

BIS is a statutory institution establishe<l under the Bureau of Indian Standards Act, 1986 to promoteharmonious dcvelopment of the activities of standardization, marking and quality certification of goodsand attcnding to connected matters in the country.

Copyright

BIS has the copyright ofall its publications. No part ofthese publications maybe reproduced in any formwithout the prior permission in writing of BIS. This does not pr€clude thc free use, in the coune ofimplementing the standard, of necessary details, such as symbols.and sizes, type or grade designations.Enquiries relating to copyright be addrcssed to the Director (Publications), BIS.

Review of Indian Standards

Amendmcnts are issued to standards as the nccd arises on the basis of comments. Sundards are alsoreviewed periodically; a standard along wilh amendments is reaffirmed when such review indicates thatno changes are needed; if the review indicates that changes are needed, it is taken up for revision. Usersof Indian Standards should ascertain that they are in posscssion ofthe latest amendments or edition byrcfcrring to the latest issue of 'BIS Handbook' and 'Standards Monthly Additions'.

This Inclian Standard has been developed from Doc: No. BDC 2 (4142)

Amendments Issued Since Publication

Amcnd No. Date of Issue Texr Affected

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