Designation:D4788−03(Reapproved2013)StandardTestMethodforDetectingDelaminationsinBridgeDecksUsingInfraredThermography1ThisstandardisissuedunderthefixeddesignationD4788;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofdelamina-tionsinportland-cementconcretebridgedecksusinginfraredthermography.Thistestmethodisintendedforuseonexposedandoverlaidconcretebridgedecks.1.2APrecisionandBiasstatementhasnotbeendevelopedatthistime.Therefore,thisstandardshouldnotbeusedforacceptanceorrejectionofamaterialforpurchasingpurposes.NOTE1—Thistestmethodcanbeusedonasphaltorconcreteoverlaysasthickas4in.(100mm).1.3Thistestmethodusesanimaginginfraredscannerandvideorecorder,mountedonavehicle,todetectdelaminationsanddebondedareasonbridgedecksandtorecordtheinformation.1.4Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D4580PracticeforMeasuringDelaminationsinConcreteBridgeDecksbySounding3.SummaryofTestMethod3.1Thevehicle-mountedinfraredscannerandvideore-corderisdrivenoverthecenterofeachlaneofabridgedeck.Thedatafromthescannerisrecordedonvideotape.Delami-nationsappearaswhiteor“hot’’areasonagrayor“cooler’’backgroundinthevideoimageonamonochromescannersystemduringdaytimetesting.Duringnighttimetesting,thedelaminationswillappearasdarkor“cooler’’areasonawhiteor“warmer’’background.Delaminationswillappearasthewarmercolorsoncolorscan...
