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1、WELCOMECEMENTCONCRETEMIXDESIGNbyK.RAMESHResearchOfficer,EngineeringMaterialsLaboratory,A.P.EngineeringResearchLaboratories,Himayatsagar,HYDERABAD-500030.2CementConcreteMixDesignmeans,determinationoftheproportionoftheconcreteingredientsi.e.Cement,Water,FineAggregate,CoarseAggreg
2、atewhichwouldproduceconcretepossessingspecifiedpropertiessuchasworkability,strengthanddurabilitywithmaximumoveralleconomy.3MethodsofConcreteMixDesignI.S.MethodBritishMethodA.C.I.Methodetc.4TheseMethodsarebasedontwobasicassumptionsCompressiveStrengthofConcreteisgovernedbyitsWate
3、r-CementRatioWorkabilityofConcreteisgovernedbyitsWaterContent5DatarequiredforconcretemixdesignGradeofConcreteEg:RCC-M30-A20SlumprequiredinmmEg:25–75mmDegreeofSiteControlEg:GoodTypeofExposureEg:ModerateGradeofCementEg:OPC43Grade6PlacingConditionsDegreeofWorkabilitySlump(mm)123Bl
4、indingConcrete;ShallowSections;PavementsusingpaversVeryLowSee7.1.1MassConcrete;LightlyreinforcedsectionsinSlabs,Beams,Walls,Columns;Floors;HandplacedPavements;Canallining;StripFootingsLow25-75HeavilyreinforcedsectionsinSlabs,Beams,Walls,Columns;Slipformwork;PumpedConcrete.Mediu
5、m50-100Trenchfill;In-SituPiling;TremieConcreteHigh100-150Workability(Clause7.1,IS:456-2000)7GoodSitecontrolhavingproperstorageofcement;weighbatchingofallmaterials;Controlledadditionofwater,regularcheckingofallmaterials,aggregategradingandmoisturecontent;Andperiodicalcheckingofw
6、orkabilityandstrength.FairSitecontrolhavingdeviationfromtheabove.DegreeofSiteControl(Table8,IS:456-2000)8Sl.No.EnvironmentExposureConditions123i)MildConcretesurfacesprotectedagainstweatheroraggressiveconditions,exceptthosesituatedincoastalarea.ii)ModerateConcretesurfacesshelter
7、edfromsevererainorfreezingwhilstwet.Concreteexposedtocondensationandrain.Concretecontinuouslyunderwater.Concreteincontactorburiedundernon-aggressivesoil/groundwater.Concretesurfacesshelteredfromsaturatedsaltairincoastalarea.iii)SevereConcretesurfacesexposedtosevererain,alternat
8、ewettinganddryingoroccasionalfreezingwhilstwetorsevere
