外文翻译--混凝土中钢腐蚀的有关问题

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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.AndradeABSTRACTThissecondpartaddressessomeimportantissuesthatremaincontroversialdespitethevastamo

2、untsofworkdevotedtoinvestigatingcorrosioninconcrete-embeddedsteel.Specifically,thesereferto:1)therelativesignificanceofgalvanicmacrocouplesandcorrosionmicrocellsinreinforcedconcretestructures;2)themechanismbywhichreinforcementscorrodeinanactivestate;3)thebestprotectivemethodsforpreventingor

3、stoppingreinforcementcorrosion;4)thepossibilityofareliablepredictionoftheservicelifeofareinforcedconcretestructure;and5)thebestcorrosionmeasurementandcontrolmethods.Theresponsesprovidedaresupportedbyexperimentalresults,mostofwhichwereobtainedbytheauthorsthemselves.1.INTRODUCTIONConcrete-emb

4、eddedsteelisknowntoremaininapassivestateundernormalconditionsasaresultofthehighlyalkalinepHofconcrete.Thepassivityofreinforcementsensuresunlimiteddurabilityofreinforcedconcrete(1KC)structures.However,therearesomeexceptionalconditionsthatdisruptsteelpassivityandcausereinforcementstobecorrode

5、dinanactivestate.Thishasraisedcontroversialinterpretations,someofwhichwerediscussedinPartIofthisseries[1].ThisPartIIanalysesthoughfarfromexhaustively,other-totheauthorsmindsatleast-equallyinterestingissuesonwhichnogeneralconsensushasbeenreached.2.MATERIALSANDMETHODSThereaderisreferredtoPart

6、Iforadetaileddescriptionofthematerialsandmethodsusedinthiswork.Mostoftheexperimentalresultsdiscussedhereinwereobtainedwiththesametypesofspecimensandslabs.Galvaniccouplesweredeterminedonspeciallydesignedspecimens,suchasthoseshowninFigs.1and2.Near-realconditionsweresimulatedbyusingabeamthatwa

7、s160cmlongand7x10cmincross-section.Thebeamwasmadefrom350kgcement/m3,halfofwhichcontainednoadditives,whiletheotherhalfincluded3%CaC12bycementweight[2],(Fig.1).InordertostudytheeffectoftheSanod/Scathoaratioongalvanicmacrocouples,theyweremodelledbysurroundi