Designation:D7234−12StandardTestMethodforPull-OffAdhesionStrengthofCoatingsonConcreteUsingPortablePull-OffAdhesionTesters1ThisstandardisissuedunderthefixeddesignationD7234;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversproceduresforevaluatingthepull-offadhesionstrengthofacoatingonconcrete.Thetestdeterminesthegreatestperpendicularforce(intension)thatasurfaceareacanbearbeforeaplugofmaterialisdetached.Failurewilloccuralongtheweakestplanewithinthesystemcomprisedofthetestfixture,adhesive,coatingsystem,andsubstrate,andwillbeexposedbythefracturesurface.1.2Thistestmethodusesaclassofapparatusknownasportablepull-offadhesiontesters.2Theyarecapableofapply-ingaconcentricloadandcounterloadtoasinglesurfacesothatcoatingscanbetestedeventhoughonlyonesideisaccessible.Measurementsarelimitedbythestrengthofadhe-sionbondsbetweentheloadingfixture,coatingsystemandthesubstrateorthecohesivestrengthsoftheadhesive,coatinglayers,andsubstrate.1.3Pull-offadhesionstrengthmeasurementsdependuponbothmaterialandinstrumentalparameters.Therearedifferentinstrumentsusedthatcomplywiththistestmethod.Thespecificinstrumentusedshouldbeidentifiedwhenreportingresults.Thistestisdestructiveandspotrepairsmaybenecessary.1.4ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:3C1583TestMethodforTensileStrengthofConcreteSur-facesandtheBondStrengthorTensileStrengthofConcreteRepairandOverlayMaterialsbyDirectTension(Pull-offMethod)D16TerminologyforPaint,Relate...
