ementpasteandaggregate,especiallycoarseaggregate,inconcretecanmoreeffectivelyexplainthephenomenaofchloridediffusionaswellascapillarypores.Thisthinlayeriscalledtheinterfacetransitionzone(ITZ).InordertoconsidertheeffectsofITZ,coarseaggregatesmmtommindiameteraresetrandomlyinthemodelconcrete.Thevolumeinconcreteandthesizedistributionofcoarseaggregatearedeterminedbythemixproportionoftheconcrete.Inthisresearch,JSCEcodevaluesareusedasstandardvalues(JSCE).TotalvolumeandsizedistributionsareshowninTableandTable,respec-tively..RelativewatercontentAdditionally,consideringtheeffectoftherelativewatercontentoftheconcreteonthedeteriorationprocess,someofthemacroandcapillaryporesaredefinedaswater-filledpores,whiletheotherporesaredefinedasair-filledpores,asshowninFig..Anincreaseinrelativewatercontentmeansanincreaseinthenumberofwater-filledpores.Therelativewater--contentoftheconcr域,腐蚀对于钢筋影响几乎没有被观察到。