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1、InternationalJournalofHeatandMassTransfer126(2018)432Ð447ContentslistsavailableatScienceDirectInternationalJournalofHeatandMassTransferjournalhomepage:www.elsevier.com/locate/ijhmtMicrostructure-basedfractalmodelsforheatandmasstransportpropertiesofcementpasteaaba,⇑cP.Yu,Y.H.Duan,E.Chen,S.W.Ta
2、ng,X.RenshawWangaStateKeyLaboratoryofWaterResourcesandHydropowerEngineeringScience,WuhanUniversity,Wuhan,ChinabDepartmentofCivilandEnvironmentEngineering,TheHongKongUniversityofScienceandTechnology,Kowloon,ClearWaterBay,HongKongcSchoolofPhysicalandMathematicalSciences&SchoolofElectricalandEle
3、ctronicEngineering,NanyangTechnologicalUniversity,SingaporearticleinfoabstractArticlehistory:Inthisstudy,acomputersimulationforthemicrostructure,heatandmasstransportpropertiesofcementReceived27March2018pasteisestablished.ConstituentphasesandporestructureofcementpasteareanalyzedindetailandaRec
4、eivedinrevisedform23May2018three-levelrepresentationofmultiscalemicrostructureofcementpasteisconstructedbasedonsomeAccepted29May2018reasonableassumptions.SimulatedresultsarecomprehensivelyanalyzedandveriÞed,whichprovesthereliabilityandefÞciencyofthepresentedsimulation.Basedonthesimulatedmicro
5、structure,trans-portpropertiesofcementpasteareinvestigatedwiththeaidoffractaltheory.FractalfeaturesofcementKeywords:pasteareobtainedthroughthesimulatedmicrostructure.Then,fractalmodelsareappliedtopredictCementpastetransportproperties(permeability,diffusivityandthermalconductivity)ofcementpast
6、e.Inordertover-MicrostructurePorestructureifythefractalmodels,experimentaldataandresultsfromothermodelsinliteratureareadoptedtomakeTransportpropertiescomparisons,whichshowsareasonableconsistencyandprovesthereliabilityandefÞciencyofthepre-Simulationsentedfractalmodels.Ó2018ElsevierLtd.Allright
7、sreserved.1.Introductionillaryporeswithsizepossiblyfromhundredsofnanometerstotensofmicrometersneedtobedetectedbyback-scatteredelectronTransportpropertiesofcementpasteareofgreatconcernduetomicroscopy(BSE)imagetest[5].Comparativelyspeaking,merc
