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1、CementandConcreteResearchxxx(xxxx)xxx–xxxContentslistsavailableatScienceDirectCementandConcreteResearchjournalhomepage:www.elsevier.com/locate/cemconresRelationshipbetweentheparticlesizeanddosageofLDHsandconcreteresistanceagainstchlorideingressa,bb,⁎a,bZ.Y.
2、Qu,Q.L.Yu,H.J.H.BrouwersaStateKeyLaboratoryofSilicateMaterialsforArchitectures,WuhanUniversityofTechnology,Wuhan430070,PRChinabDepartmentoftheBuiltEnvironment,EindhovenUniversityofTechnology,P.O.Box513,5600,MB,Eindhoven,TheNetherlandsARTICLEINFOABSTRACTKeyw
3、ords:ThepresentstudyinvestigatesthetransportpropertiesofcementmortarwithCa-Al-NO3layereddoublehy-Ca-Al-NO3layereddoublehydroxidesdroxides(LDHs).Aco-precipitationmethodisappliedtosynthesizetheCa-Al-NO3LDHsandtheeffectoftheTortuositysynthesisenvironmentonthesi
4、zeandparticleshapeisstudied.ThesynthesizedCa-Al-NO3LDHsareanalyticallyRapidchloridemigrationcharacterizedbyXRD,SEMandFTIRanalyses.TherelationshipsbetweenthesizesandadditionamountofCa-Long-termchloridediffusiontestAl-NO3LDHsandthemechanicalandtransportpropert
5、iesofmortarsareinvestigated.RapidchloridemigrationTransportproperty(RCM)testsareperformedtothecementmortarswithCa-Al-NO3LDHs.TheresultsshowthatpermeabilityofMechanicalpropertythedesignedconcretedecreasedwiththeadditionofCa-Al-NO3layereddoublehydroxides(LDHs
6、).Thedecreaseofchloridemigrationcoefficientscanbeattributedtotheenhancedbarriereffectbecauseoftheincreaseoftortuosity.Inlong-termnaturaldiffusiontests,LDHspresentsignificantlyenhancedbarriereffectduetothecombinedchloridebindingabilityandimprovedtortuosity.1.Intro
7、ductionworkbyMaxwellandCussler[16,17],anadditionofonly1%offlake-shapedadditiveswithahighaspectratiobyvolumewillobviouslyThedurabilityofconcreteinmostcasesisrelatedtoitspermeabilityincreasethephysicalbarrierpropertyofthehybridmatrix.Thetortu-(ormorepreciselyp
8、enetrability)tofluids[1–3].Thepermeabilityisaosityofpenetrationpathfordiffusingmoleculesisprincipallyinflu-resultantofmanyfactorssuchasthepermeableporosityofthehar-encedbythefollowingfactors:thevolumefrac
