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1、ACIMATERIALSJOURNALTECHNICALPAPERTitleNo.111-M29GeneralizedChloridePermeabilityTestforBlendedandNonblendedConcretebyAshrafR.Mohamed,WegdanW.El-Nadoury,andMohamedT.AyyobCorrosionofreinforcementrepresentsamajorchallengeforreportedbyWhiting,9whichresultsinhighercurrentflowconcretestructures,particu
2、larlywiththepresenceofchlorides.basedontheinfluenceoftemperatureonconductivity(thatCurrently,therapidchloridepermeabilitytest(RCPT)representsis,regardlessofphysicalorchemicalchanges).Finally,theaneffectivequalitycontrolpracticeforconcretechlorideperme-testcangivemisleadingresultswhenusedonconcre
3、tethatability.Nevertheless,theinclusionofpozzolanicmaterialsshowscontainspozzolanicmaterials.TheresultsoftheRCPTforsomediscrepanciesintheresults,whichraisesaquestionabouttheblendedconcretesmagnifytheeffectofpozzolanicmate-validityofRCPTasageneralizedtest.Aproposedtestispresented—rialscomparedwit
4、hresultsobtainedbydirecttests.ForamodifiedRCPT(MRCPT)—wherethetestingvoltageisloweredinstance,Pfeiferetal.10obtainedinconsistenttestresultsto30V,andthechloridepenetrationdepthismeasuredasanindexofchloridepermeability.ComprehensiveresearchhasbeenwhencomparingtheRCPTandpondedtestprocedures.Aconduc
5、tedonvariousconcretemixtureswithandwithoutsilicacomparisonindicatedthatconventionalconcretesmadewithfumeasapozzolanicmaterialusingtheRCPT,MRCPT,andsaltonlyordinaryportlandcementmayexhibitcoulombvaluespondingtest.AgoodcorrelationbetweentheMRCPTandthestan-sixto15timeshigherthanthosecontainingpozzo
6、lanicmate-dardmethodshasbeenfound,demonstratingthevalidityoftherials.Thecorrespondingactualchlorideingressinthe90-dayproposedtest.pondingtest,however,isonlyonetotwotimeshigherthanthesameconcretemixtureswithsilicafume.Also,ScanlonKeywords:chloride;permeability;qualitycontrol;silicafume.andSherman
7、11reportedasubstantialconflictbetweenthetwotestproceduresandstatedthatthegeneralizedrelation-INTRODUCTIONshipfoundbyWhiting9wasnotvalidifsilicafume,flyash,Concretequalityhaslongbeenattributedsolelytoitsorhigh-rangewater-redu
