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【英文标准名称】:StandardTestMethodforEvaluatingAsphalt-CoveredConcreteBridgeDecksUsingGroundPenetratingRadar
【原文标准名称】:使用地面穿透雷达对沥青覆盖的混凝土平台评价的标准试验方法
【标准号】:ASTMD6087-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D04.32
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:asphalt-covereddecks;bridgedecks;delaminations;deterioration;GPR;ground-penetratingradar;nondestructivetesting;radar;Bridge/structuralmaterials--decks;Delamination--pavingapplications;Asphalt-covereddecks;Concretebriegedecks;Concrete
【摘要】:Thistestmethodprovidesinformationontheconditionofconcretebridgedecksoverlaidwithasphalticconcretewithoutnecessitatingremovaloftheoverlay,orotherdestructiveprocedures.Thistestmethodalsoprovidesinformationontheconditionofbridgedeckswithoutoverlaysandwithportlandcementconcreteoverlays.Asystematicapproachtobridgedeckrehabilitationrequiresconsiderabledataontheconditionofthedecks.Inthepast,datahasbeencollectedusingthetraditionalmethodsofvisualinspectionsupplementedbyphysicaltestingandcoring.Suchmethodshaveproventobetedious,expensive,andoflimitedaccuracy.Consequently,GPRprovidesamechanismtorapidlysurveybridgesinanefficient,non-destructivemanner.Informationontheconditionofasphalt-coveredconcretebridgedecksisneededtoestimatebridgedeckconditionformaintenanceandrehabilitation,toprovidecost-effectiveinformationnecessaryforrehabilitationcontracts.GPRiscurrentlytheonlynon-destructivemethodthatcanevaluatebridgedeckconditiononbridgedeckscontaininganasphaltoverlay.1.1Thistestmethodcoversseveralgroundpenetratingradar(GPR)evaluationproceduresthatcanbeusedtoevaluatetheconditionofconcretebridgedecksoverlaidwithasphalticconcretewearingsurfaces.Theseprocedurescanalsobeusedforbridgedecksoverlaidwithportlandcementconcreteandforbridgedeckswithoutanoverlay.Specifically,thistestmethodpredictsthepresenceorabsenceofconcreteorrebardeteriorationatorabovethelevelofthetoplayerofreinforcingbar.1.2Deteriorationinconcretebridgedecksismanifestedbythecorrosionofembeddedreinforcementorthedecompositionofconcrete,orboth.Themostseriousformofdeteriorationisthatwhichiscausedbycorrosionofembeddedreinforcement.Corrosionmaybeinitiatedbydeicingsalts,usedforsnowandicecontrolinthewintermonths,penetratingtheconcrete.Inaridclimates,thecorrosioncanbeinitiatedbychlorideionscontainedinthemixingredients.Deteriorationmayalsobeinitiatedbytheintrusionofwaterandaggravatedbysubsequentfreeze/thawcyclescausingdamagetotheconcreteandsubsequentdebondingofthereinforcingsteelwiththesurroundingcompromisedconcrete.1.2.1Asthereinforcingsteelcorrodes,itexpandsandcreatesacrackorsubsurfacefractureplaneintheconcreteatorjustabovethelevelofthereinforcement.Thefractureplane,ordelamination,maybelocalizedormayextendoverasubstantialarea,especiallyiftheconcretecovertothereinforcementissmall.Itisnotuncommonformorethanonedelaminationtooccurondifferentplanesbetweentheconcretesurfaceandthereinforcingsteel.Delaminationsarenotvisibleontheconcretesurface.However,ifrepairsarenotmade,thedelaminationsprogresstoopenspallsand,withcontinuedcorrosion,eventuallyaffectthestructuralintegrityofthedeck.1.2.2Theportionofconcretecontaminatedwithexcessivechloridesisgenerallystructurallydeficientcomparedwithnon-contaminatedconcrete.Additionally,thechloride-contaminatedconcreteprovidesapathwayforthechlorideionstoinitiatecorrosionofthereinforcingsteel.Itisthereforeofparticularinterestinbridgedeckconditioninvestigationstolocatenotonlytheareasofactivereinforcementcorrosion,butalsoareasofchloride-contaminatedandotherwisedeterioratedconcrete.1.3Thistestmethodmaynotbesuitableforevaluatingbridgeswithdelaminationsthatarelocalizedoverthediameterofthereinforcement,orforthosebridgesthathavecathodicprotection(cokebreezeascathode)installedonthebridgeorforwhichaconductiveaggregatehasbeenusedintheasphalt(thatis,blastfurnaceslag).Thisisbecausemetalsareper......
【中国标准分类号】:E43
【国际标准分类号】:91_080_40
【页数】:6P.;A4
【正文语种】:英语