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1、CementandConcreteResearch29(1999)487–495ModellingchloridediffusioninconcreteEffectofflyashandslagMichaelD.A.Thomasa,*,PhilB.BamforthbaDepartmentofCivilEngineering,UniversityofToronto,35St.GeorgeSt.,Toronto,OntarioM5S1A4,CanadabTaywoodEngineeringLtd.,TaywoodHouse,345RuislipRoad,Southall,Middlesex,U
2、B12QX,UnitedKingdomManuscriptreceived29July1998;acceptedmanuscript15October1998AbstractDatafromlong-termfieldandlaboratorystudiesofconcreteexposedtochlorideenvironmentswereanalyzedusingachloridetransportmodeldevelopedattheUniversityofToronto.Theresultsshowthattheincorporationofflyashandslagmayhave
3、littleimpactontransportpropertiesdeterminedatearlyages(e.g.,28days),butcanleadtoorderofmagnitudeimprovementsinthelongterm.Thismeansthattherateofchloridepenetrationduringthefirst6monthsorsoofexposureissimilarforconcreteswithandwithoutthesematerials.However,af-terafewyearsofexposure,chlorideingresss
4、lowstoamuch-decreasedrateinflyashandslagconcretes,leadingtodramaticincreasesinthepredictedservicelife.Predictivemodelsandlaboratorytestmethodsfordeterminingchlorideingressshouldtakeaccountofthetime-depen-dentnatureofthetransportprocessesinconcrete,especiallywhensupplementarycementingmaterials,such
5、asflyashorslag,areused.©1999ElsevierScienceLtd.Allrightsreserved.Keywords:Modeling;Diffusion;Chloride;PozzolanTheabilityofconcretetoresistthepenetrationofchlo-1.Detailsofconcretesrideionsisacriticalparameterindeterminingtheservice1.1.Folkestoneblockslifeofsteel-reinforcedconcretestructuresexposedt
6、ode-icingsaltsormarineenvironments.TheeffectofflyashandEighteenreinforcedconcreteblocks(1.030.530.3m)slagonthemasstransferpropertiesofconcretehavebeenwerecastinautumn1987andexposedinthesplashzoneonwelldocumented;however,muchoftheavailabledatarefertheseafrontatFolkestoneonthesoutheastcoastofEn-tore
7、lativelyshort-termtesting(e.g.,typically1monthto1gland.Sixdifferentconcretemixeswereused(threeblocksyear).Thispaperpresentsdatafromanumberoflong-termfromeach).Thispaperisonlyconcernedwiththreemixes:fieldandlabora
