IS 4926 (2003): Code of Practice Ready-Mixed Concrete

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2 $ ' + - Satyanarayan Gangaram Pitroda Invent a New India Using Knowledge 0 1 ' 5 Jawaharlal Nehru Step Out From the Old to the New 1 + , 1 + Mazdoor Kisan Shakti Sangathan The Right to Information, The Right to Live ! > 0 B Bhart hari N ti atakam Knowledge is such a treasure which cannot be stolen Invent a New India Using Knowledge IS 4926 (2003): Code of Practice Ready-Mixed Concrete [CED2: Cement and Concrete ]IS4926:2003 IndianStandardREADY-MIXEDCONCRETE CODEOFPRACTICE(SecondRevision) ,9 BAHADURSHAHZAFARMARGNEWDELHII1 OOO2 May2003 PriceGroup8 CementandConcreteSectionalCommittee,CED2 FOREWORDThisIndianStandard(SecondRevisio n)wasadoptedbytheBureauofIndianStandards , :a) )Requirementsformaterialsbroughtinlinewi thIS456:2000 Plainandreinforcedconcrete Codeofpractice.

3 C) )Basisofsupplymodifiedtobringitinlinewit hIS456:2000 Plainandreinforcedconcrete Codeofpractice .e) ) ) ) ) ) )Adetai! ) ) , ,observedorcalculated,expressingtheresul tofatestshallberoundedoffinaccordancewit hIS2:1960 Rulesforroundingoffnumericalvalues(revis e@ .Thenumberofsignificantplacesretainedint heroundedoffvalueshouldbethesameasthatof thespecifiedvalueinthisstandard. IS4926:2003 IndianStandardREADY-MIXEDCONCRETE CODEOFPRACTICE(SecondRevision) ,compaction, , , , , Amixtureofaggregate,cementandwaterwithor withoutadmixturesand/oradditionsandinclu dingentrappedorentrainedair, Massofaquantityofcompactedfreshconcreted ividedbyitsvolume, Mixforwhichthepurchaserisresponsiblefors peci~ Ratioofthemassoffreewater(thatisexcludin gthewaterabsorbedbytheaggregateinasatura tedsurfacedrycondition) Numericalvalueofcharacteristiccompressiv estrengthof150mmcubeofconcreteat28days,d esignatedby M followedbythisstrengthvalueinN/mm* ,inunitvolumeofspecifiedmix(seealsoNote2 underTable5ofIS456).

4 Concretemixedinastationarymixerinacentra lbatchingandmixingplantorinatruck-mixera ndsuppliedinthefreshconditiontothepurcha sereitheratthesiteorintothepurchaser Amixergenerallymountedonaself-propelledc hassis, ,structuralperformance,durabilityandappe aranceofthefinishedstructure, , IS4926 , ,ifnecessary, , $ , (fullorpart) , , , , , , ,thepointandtimeofsamplingshallbeatdisch argefromtheproducer sdeliveryvehicleorfromthemixertothesiteo rwhendeliveredintothepurchaser (seeAnnexC). , sdeliveryvehicledischargeonsiteorupondis chargeintothepurchaser :SlumpCompactingfactor:+25mmor+1/3ofthes pecifiedvalue,whicheverisless.+ , ,* , ,and+ , ,forveryhighworkability(seeIS9103).

5 Acceptancecriteriaforspread(flow) ,theminimumtestingfrequencytobeappliedby theproducerintheabsenceofarecognizedread y-mixedconcreteindustrymethodofproductio ncontrol,shouldbeonesampleforevery50m3of productionorevery50batches, (seealsoIS456).Inordertogetarelativelyqu ickerideaofthequalityofconcrete,optional testonbeamsformodulusofruptureat72+ , ,tolerance,frequencyofassessment, , ,suchasnoticetobegivenpriortodelivery,de liveryrate,thenameofthepurchaser sauthorizedrepresentativewhowillcoordina tedeliveries,anyrequirementsforadditiona lservicessuchaspumping,onsitetestingortr aining, , 1S4926 , ,theproducershallprovidethepurchaserwith thefollowinginformationbeforeanyconcrete issupplied:a)b)c)Natureandsourceofeachco nstituentmaterial,Sourceofsupplyofcement , ,theproducershallprovidethepurchaserthef ollowinginformationonadmixtures:a)b)c)d) e)Generictype(s)oftbemainactiveconstitue nt(s)intheadmixture.

6 Whetherornottheadmixturecontainschloride sandifso,thechloridecontentoftheadmixtur eexpressedasapercentageofchlorideionbyma ssofadmixture;Whetherornottheadmixturele adstotheentrainmentofairwhenusedattheado pteddosage;Wheremorethanoneadmixtureisus ed,confirmationoftheircompatibility;andI nitialandfinalsettingtimeofconcretewhena dmixtureisusedatadopteddosage(testedaspe r1S8142). { , (seealsoIS4082).Incase,thecementremainsi nstorageformorethan3months, ,silicafume,metakeolin,ricehuskash,groun dgranulatedblastfurnaceslagsuchasforceme nt,shallbeprovided, (coarseandfme) (seealsoIS4082andIS456). ,contaminationortheeffectsofprolongedexp osuretosunlight(ifapplicable).Agitations hallbeprovidedforliquidadmixtures, ,mineraladmixtures,aggregatesandwaterand chemicaladmixture(ifmeasuredbymass) ,asthequantityrequiredintheweighinghoppe risapproached,thematerialmaybeaddedataco ntrollablerateandshutoffpreciselywithint heweighingtolerancesspecified4 IS4926 ,mineraladmixturesaggregateshallbecapabl eofreceivingtheirratedload, , ,upto10percentofthenominalcapacityofthew eighscale, , ,wherefitted, , , , , (orpaste)}

7 , *2percentofthequantityofcementandmineral admixturesbeingmeasuredandwithin+3percen tofthequantityofaggregate, providedwithacleardisplayofthequantities ofmaterialstobebatchedforeachmixandbatch sizeandwithinformationidenti~ ,mineraladmixtures, , , , ~orcentralmixersStationarymixersshallnot beloadedinexcessofthemanufacturer ,includingwater, IS4926:2003\ ,mixingandtransportingplant, ,mixingshallbecon- deredtocommencefromthemomentwhenallthema terialspositionofthepersonresponsiblefor ensuringthatthemaintenanceschedulesareca rriedoutshallbeincludedrequiredforthebat ch,includingwater, ,transitmixersandtheproduceasatisfactory mix,andwherethereisnodatadeliverysitesoa stoensurethecomplianceofserviceavailabie toes~ ,mixingshallcontinuefornotlessthan60revo lutionsofthetruckmixerdrumatarateofnotle ssthan7 , , , ,onthemixingblades, ,duetoweartheheightordepthofthemixingbla desorpaddlesislessthantwo-thirdsoftheori ginal.

8 (whereinthefollowingthetermminimizeisuse ditisunderstoodtomeantoreducetothelowest realisticlevelusingtechnologieswhicharep roven,reasonableandeconomic). ,commercial, ,Of)lceBuildingsandSta#FacilitiesTheprod ucershallensurethatplantbuildingsaresuit ablymaintained, ~ , , ,includingweekly,monthlyandquarterlyrout ines,shallbepreparedtocovergeneralstorag e,handling, , ,samplingandtesting, ,thedateofthenextcalibration, ,includingdetailsofwhichcustomersweresup plied, ,thatis,loadcells,flowmeters,magmeters,e tc,ispreferableoverpurelymechanicalsyste ms,thatis, 1S4926 (thusremovingtheneedtovisuallyinspectatt heplant) ,written,printedorgraphicalrecordsshallb emadeofthemassofthematerialsbatched,thee stimatedslump,thetotalamountofwateradded totheload,thedeliveryticketnumberforthat load, ,oratthetimeof, ,otherthantheamountrequiredtoproducethes pecifiedworkability, ,andwhereappropriate,plasticdensity, , (seeIS456).

9 ,suchasaggregategrading,slump,orairconte nt, ,orderswhetherreceivedverballyorinwritin g, ,delivery8 IS4926:2003andthefunctionoftheproducer , :a)Productionanddelivery:1)Batchinginstr uctions,2)Batchingrecords,3)Deliverytick ets,and4) )Materialsandproductioncontrol:1)Concret eproductionandmaterialspurchase,usageand stocks,and2) )Productionqualitycontrol:Controltestres ultsANNEXA(Ckzuse2)LISTOFREFERREDINDIANS TANDARDS[ :1999 Coarseandfineaggregatesfromnaturalsource sforconcrete Specification(thirdrevision)456:2000 Plainandreinforcedconcrete Codeofpractice~ourthrevision)1199:1959 Methodsofsamplingandanalysisofconcrete40 82:1996 Recommendationsonstackingandstorageofcon structionmaterialsandcomponentsatsite(se condrevision) :1991 Methodsfortestingperformanceofbatch-type concretemixers(firstrevision)8;42:1976 Methodoftestfordeterminingsettingtimeofc oncretebypenetrationresistance9103:1999 Concreteadmixtures Specifi-cation(firstrevision)14858:2000 Compressiontestingmachineusedfortestingo fconcretetindmortar Requirements IS4926:2003 ANNEXB( )MATERIALSTESTINGREQUIREMENTSB-1 AGGREGATESA ggregatesshallbetestedataminimumfrequenc yindicatedbythehighorlowtestratesgivenbe low:MinimumTestFrequencies,s[A<qgregu/f? ]]

10 TypeoJAggregateAssessmentof,%10 Property/TypicalPropertiesParumetdrandHi ghTestRateNormalMonitoringandLowTestRate (5)RequirementforNormalMonitoringandLowT estRate(6)(1)(2)(3)(4)i)GradingSand/fine WeeklyCoarse singlesized gradedWeeklyWeeklyMonthlyLast8resultscon formtoIS383orrepresentativevaluesMonthly ii)ParticleDensityovendrySatoratcclsurfa cedryApparentLast4resultsWeeklyWeeklyWee kly3monthly3monthly3monthly}AlltypesAllt ypes* )iv) +75kghrf+75kg/mqAlltypesAlltypesSandCoar seMonthlyMonthlyWeeklyMonthly6monthly6mo nthlyFines(silt)CrrntcntMonthly3monthlyL ast10results<75percentmaximumallowedv)vi )vii)viii)ix)~)Aggregate[lllpl~tvil[LleC oarseAsspecifiedAsspecified I0(%FinesCoarseCoarseYearly2 WeeklyYearly6monthly FIakincssLast3resultsconformtostandardCh loride( ontelltAlltypesWeekly6monthlyLast3result s< (I,osAngelesMelhod)CoarseYearly/Sourcech ange xi)~ii)soundnessFineandCoarseYearly/Sour cechange )PetrographicDescription((;eneral)Alltyp es IS4926 :a)Hightestrate1)Toestablishthetypicalch aracteristicsofanaggregate,and2) )Lowtestrate1)Whenthetypicalcharacterist icsoftheaggregatehavebeenestablished,and 2)Whensubsequenttestsliewithinthetoleran cesforlowtestratesgiven.]]