資源描述:
《外文翻譯--混凝土中鋼腐蝕的有關(guān)問(wèn)題》由會(huì)員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在工程資料-天天文庫(kù)。
1、外文原文II:Somequestionsonthecorrosionofsteelinconcrete.PartⅡ:Corrosionmechanismandmonitoring,servicelifepredictionandprotectionmethodsJ.A.Gonzdlez,S.Felifd,P.Rodffguez,W.Lfpez,E.Ramlrez,C.Alonso,C.AndradeABSTRACTThissecondpartaddressessomeimportantissuesthatremaincontroversialdespitethevastamount
2、sofworkdevotedtoinvestigatingcorrosioninconcrete-embeddedsteel.Specifically,thesereferto:1)therelativesignificanceofgalvanicmacrocouplesandcorrosionmicrocellsinreinforcedconcretestructures;2)themechanismbywhichreinforcementscorrodeinanactivestate;3)thebestprotectivemethodsforpreventingorstoppi
3、ngreinforcementcorrosion;4)thepossibilityofareliablepredictionoftheservicelifeofareinforcedconcretestructure;and5)thebestcorrosionmeasurementandcontrolmethods.Theresponsesprovidedaresupportedbyexperimentalresults,mostofwhichwereobtainedbytheauthorsthemselves.1.INTRODUCTIONConcrete-embeddedstee
4、lisknowntoremaininapassivestateundernormalconditionsasaresultofthehighlyalkalinepHofconcrete.Thepassivityofreinforcementsensuresunlimiteddurabilityofreinforcedconcrete(1KC)structures.However,therearesomeexceptionalconditionsthatdisruptsteelpassivityandcausereinforcementstobecorrodedinanactives
5、tate.Thishasraisedcontroversialinterpretations,someofwhichwerediscussedinPartIofthisseries[1].ThisPartIIanalysesthoughfarfromexhaustively,other-totheauthorsmindsatleast-equallyinterestingissuesonwhichnogeneralconsensushasbeenreached.2.MATERIALSANDMETHODSThereaderisreferredtoPartIforadetailedde
6、scriptionofthematerialsandmethodsusedinthiswork.Mostoftheexperimentalresultsdiscussedhereinwereobtainedwiththesametypesofspecimensandslabs.Galvaniccouplesweredeterminedonspeciallydesignedspecimens,suchasthoseshowninFigs.1and2.Near-realconditionsweresimulatedbyusingabeamthatwas160cmlongand7x10c
7、mincross-section.Thebeamwasmadefrom350kgcement/m3,halfofwhichcontainednoadditives,whiletheotherhalfincluded3%CaC12bycementweight[2],(Fig.1).InordertostudytheeffectoftheSanod/Scathoaratioongalvanicmacrocouples,theyweremodelledbysurroundi