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1、StandardPracticeforEvaluationofCoatingSystemswithZinc-RichPrimersDeleted:3AASHTODesignation:R31-04AmericanAssociationofStateHighwayandTransportationOfficials444NorthCapitolStreetN.W.,Suite249Washington,D.C.20001StandardPracticeforEvaluationofCoatingSystemswithZinc-RichPrimersDeleted:
2、3AASHTODesignation:R31-041.SCOPE1.1.Thisspecificationcoversthetestingcriteriaforevaluationofzinc-richcoatingsystemsforuseonironandsteelsurfaces.1.2.Theinorganicandorganiczinc-richprimerswithtopcoatsareintendedforuseonbridges,similarstructuralsteel,andotherferrousmetalsurfaces,bothnew
3、andexisting,cleanedtoaminimumofSSPC-SP10,whicharesubjecttocorrosiveatmosphericenvironments,suchasmarine,industrial,deicingchemicals,andhighhumidity.1.3.ThevaluesstatedinSIunitsaretoberegardedasstandard.1.4.Thisstandardmayinvolvehazardousmaterials,operations,andequipment.Itdoesnotpurp
4、orttoaddressallsafetyproblemsassociatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishtheappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Note1—Thetestingformatandsuggestedacceptancecriteriaforthisstandardhavebeendeve
5、lopedaroundathree-coatsystemconsistingofazincprimer,epoxyorurethaneintermediate,andanaliphaticurethanefinishcoat.2.REFERENCEDDOCUMENTS2.1.Referencetostandardspecifications,testingproceduresandotherstandardprocedurescontainedinthisdocumentshallbethelatesteditionofthepublisheddocumenta
6、tthedateofthis“EvaluationCriteria.”2.1.1.AASHTOStandards:¦M300,InorganicZinc-RichPrimer¦TP65Non-InstrumentalDeterminationofMetallicZincFormatted:BulletsandNumbering¦TP66AnalysisofStructuralSteelCoatingsforHinderedAmineLightStabilizers¦TP67AnalysisofStructuralSteelCoatingsforIsocyanat
7、eContent¦StandardSpecificationsforHighwayBridges2.1.2.ASTMStandards:¦A36/A36M,SpecificationforCarbonStructuralSteel¦B117,PracticeforOperatingSaltSpray(Fog)Apparatus¦D476,ClassificationforDryPigmentaryTitaniumDioxidePigments¦D512,TestMethodsforChlorideIoninWaterTS-4cR31-1AASHTO¦D520,S
8、pecification
