Concret Properties and Mix Design

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1、ConcretePropertiesandMixDesignAcknowledgementsThefollowingsourcesofinformationwereusedinthedevelopmentofthismodule:ACPAPCA,“DesignandControlofConcreteMixtures”AmericanConcreteInstitute(ACI)IntegratedMaterialsandConstructionPractices(IMCP)ManualDr.PeterTaylor,CPTechCenterDr.KenHo

2、ver,CornellUniversityFutureDirections:ConcretePavementRoadMap12strategicandcoordinatedresearchtracksarecontainedintheCPRoadMap–TheLong-TermPlanforConcretePavementResearchandTechnology.Thisdocumentrepresentsacomprehensiveplanforresearchandimplementationwithinputfromallmajorstakeh

3、olders.Approximately250definedresearchstatementsdesignedto“strategizeandcoordinate”concretepavementresearchefforts.Track1:Performance-BasedConcretePavementMixDesignSystemThefinalproductofthistrackwillbeapracticalyetinnovativeconcretemixdesignprocedurewithnewequipment,consensusta

4、rgetvalues,commonlaboratoryprocedures,andfullintegrationwithbothstructuraldesignandfieldqualitycontrol–alabofthefuture.ThisprojectiscurrentlyunderwayasajointeffortbetweenACPA,PCA,FHWAandStateHighwayAgencies.A2-3yeareffortisanticipated,butprocessimprovementswillbereleasedasdevelo

5、ped.DefinitionsThewater/cementratio(w/c)istheweightofwaterdividedbytheweightofcement.Whensupplementarycementitiousmaterials(SCM’s)areused,thew/cisreferredtoasthewater/cementitiousmaterialsratio(w/cm)andistheweightofwaterdividedbytheweightofcementandSCM’s.Thesetermsaresometimesus

6、edinterchangeably.WhatisnotCoveredinDetail?Thefollowingpointsarenotaddressedindetailandarethesubjectofsubsequentwebinars:Concretemixoptimization.Optimizingaggregategradation.Materialsincompatibilityissues.Concretemixevaluationandtroubleshooting.MixDesignMixdesignistheprocessofde

7、terminingrequiredandspecifiablecharacteristicsofaconcretemixture.Prescriptiveapproach(limitsonmaterials).Performanceapproach(desirablecharacteristics).Mixdesignrequirementsarebasedonintendeduse,environment,etc.MixDesignAddresses:EnvironmentIntendedUseBasicMixProportioningMixprop

8、ortioningistheprocessofdeterminingthequantities