Designation:D6087−22StandardTestMethodforEvaluatingAsphalt-CoveredConcreteBridgeDecksUsingGroundPenetratingRadar1ThisstandardisissuedunderthefixeddesignationD6087;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversseveralgroundpenetratingradar(GPR)evaluationproceduresthatcanbeusedtoevaluatetheconditionofconcretebridgedecksoverlaidwithasphalticconcretewearingsurfaces.Theseprocedurescanalsobeusedforbridgedecksoverlaidwithportlandcementconcreteandforbridgedeckswithoutanoverlay.Specifically,thistestmethodpredictsthepresenceorabsenceofconcreteorrebardeteriorationatorabovethelevelofthetoplayerofreinforc-ingbar.1.2Deteriorationinconcretebridgedecksismanifestedbythecorrosionofembeddedreinforcementorthedecompositionofconcrete,orboth.Themostseriousformofdeteriorationisthatwhichiscausedbycorrosionofembeddedreinforcement.Corrosionmaybeinitiatedbydeicingsalts,usedforsnowandicecontrolinthewintermonths,penetratingtheconcrete.Inaridclimates,thecorrosioncanbeinitiatedbychlorideionscontainedinthemixingredients.Deteriorationmayalsobeinitiatedbytheintrusionofwaterandaggravatedbysubse-quentfreeze/thawcycles,causingdamagetotheconcreteandsubsequentdebondingofthereinforcingsteelwiththesur-roundingcompromisedconcrete.1.2.1Asthereinforcingsteelcorrodes,itexpandsandcreatesacrackorsubsurfacefractureplaneintheconcreteatorjustabovethelevelofthereinforcement.Thefractureplane,ordelamination,maybelocalizedormayextendoverasubstantialarea,especiallyiftheconcretecovertotherein-forcementissmall.Itisnotuncommonformorethanonedelaminationtooccurondifferentplanesbetweentheconcretesurfaceandthereinforcingsteel.Delaminationsarenotvisibleontheconcretesurface.However,ifrepairsarenotmade,thedelaminationsprogresstoopenspallsand,withcontinuedcorrosion,eventuallyaffectthestructu...
