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1、外文原文II:Somequestionsonthecorrosionofsteelinconcrete.PartⅡ:Corrosionmechanismandmonitoring,servicelifepredictionandprotectionmethodsJ.A.Gonzdlez,S.Felifd,P.Rodffguez,W.Lfpez,E.Ramlrez,C.Alonso,C.AndradeABSTRACTThissecondpartaddressessomeimportantissuesthatrem
2、aincontroversialdespitethevastamountsofworkdevotedtoinvestigatingcorrosioninconcrete-embeddedsteel.Specifically,thesereferto:1)therelativesignificanceofgalvanicmacrocouplesandcorrosionmicrocellsinreinforcedconcretestructures;2)themechanismbywhichreinforcemen
3、tscorrodeinanactivestate;3)thebestprotectivemethodsforpreventingorstoppingreinforcementcorrosion;4)thepossibilityofareliablepredictionoftheservicelifeofareinforcedconcretestructure;and5)thebestcorrosionmeasurementandcontrolmethods.Theresponsesprovidedaresupp
4、ortedbyexperimentalresults,mostofwhichwereobtainedbytheauthorsthemselves.1.INTRODUCTIONConcrete-embeddedsteelisknowntoremaininapassivestateundernormalconditionsasaresultofthehighlyalkalinepHofconcrete.Thepassivityofreinforcementsensuresunlimiteddurabilityofr
5、einforcedconcrete(1KC)structures.However,therearesomeexceptionalconditionsthatdisruptsteelpassivityandcausereinforcementstobecorrodedinanactivestate.Thishasraisedcontroversialinterpretations,someofwhichwerediscussedinPartIofthisseries[1].ThisPartIIanalysesth
6、oughfarfromexhaustively,other-totheauthorsmindsatleast-equallyinterestingissuesonwhichnogeneralconsensushasbeenreached.2.MATERIALSANDMETHODSThereaderisreferredtoPartIforadetaileddescriptionofthematerialsandmethodsusedinthiswork.Mostoftheexperimentalresultsdi
7、scussedhereinwereobtainedwiththesametypesofspecimensandslabs.Galvaniccouplesweredeterminedonspeciallydesignedspecimens,suchasthoseshowninFigs.1and2.Near-realconditionsweresimulatedbyusingabeamthatwas160cmlongand7x10cmincross-section.Thebeamwasmadefrom350kgce
8、ment/m3,halfofwhichcontainednoadditives,whiletheotherhalfincluded3%CaC12bycementweight[2],(Fig.1).InordertostudytheeffectoftheSanod/Scathoaratioongalvanicmacrocouples,theyweremodelledbysurroundi
