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1、The12thInternationalSymposiumonStructuralEngineeringSTUDYONTHEEFFECTOFNATURALCLIMATEONTHECORROSIONOFREBARINCONCRETEJianhuaJiangCollegeofCivilandTransportationEngineering,HohaiUniversity,Nanjing210098,P.R.ChinaAbstract:Naturalclimateisanimportantfactorthataffectsthedurability
2、ofreinforcedconcrete(RC)structures,andthereforemustbetakenintoaccountinthedegradationmodelsfordurabilityofRCstructures.Inordertoinvestigatethedevelopmentofcorrosionrateofthereinforcingrebarinconcreteundernaturalclimateenvironment,thelong-termtestonthecorrosionoftherebarincon
3、cretewascarriedoutundertheshelteredconditioninnaturalclimate;atthesametime,thetestontheresponseofthemicro-environmentofconcretecorrespondingtothenaturalclimateenvironmentwasalsoconductedinordertoanalyzetheeffectofnaturalclimateoncorrosionofrebarinconcrete.Theresultsshowthat,
4、thecorrosionrateoftherebarinconcreteundernaturalclimateenvironmentisfluctuantandtime-dependent;thechangesinenvironmentalconditionofthemicro-environmentofconcretelagbehindthatofnaturalclimate,especiallyinrelativehumidity.Itisconcludedthatthecorrosionoftherebarinconcreteisdire
5、ctlyaffectedbythemicro-environmentofconcretethatdependsontherandomfluctuationsofnaturalclimate,andtemperatureistheprimaryfactorthatinfluencesthecorrosionofrebarinconcreteundershelteredconditionofnormalatmosphericenvironment.Keywords:Naturalclimate,micro-environment,corrosion
6、rate,temperature,relativehumidity1INTRODUCTIONchloridediffusioncoefficient,acalculationmodelofchloridepenetratingintoconcretebasedonfinitedifferenceisestablishedbyShiNaturalclimateenvironmentistherealenvironmentandLuo(2004).LopezandGonzalez(1993)andofRCstructure,andisofrando
7、mness,Enevoldsenetal.(1994)analyzedtheinfluenceuniquenessandcomplexityduetotheeffectsofofporewatersaturation,resistivity,andinternalgeographicallocation,meteorologicalfactors,relativehumidityofconcreteonthecorrosionetc.ForRCstructureslocatedindifferentrateofrebarandsuggested
8、thatacriticalporeregions,theirservicelivesareusuallydifferentwatersaturatio
