Designation:A421/A421M−15AmericanAssociationStateHighwayandTransportationOfficialsStandardAASHTONo.:M204StandardSpecificationforStress-RelievedSteelWireforPrestressedConcrete1ThisstandardisissuedunderthefixeddesignationA421/A421M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thisspecificationcoverstwotypesofstress-relievedroundhigh-carbonsteelwirecommonlyusedinprestressedconcreteconstruction,asfollows:1.1.1TypeBAwireisusedforapplicationsinwhichcold-enddeformationisusedforanchoringpurposes(ButtonAnchorage),and1.1.2TypeWAwireisusedforapplicationinwhichtheendsareanchoredbywedges,andnocold-enddeformationofthewireisinvolved(WedgeAnchorage).1.2Asupplementaryrequirement(S1)isprovidedforusewherelow-relaxationwireandrelaxationtestingforthatproductisrequiredbythepurchaser.Thesupplementaryrequirementappliesonlywhenspecifiedinthepurchaseorder.1.3Thisspecificationisapplicableforordersineitherinch-poundsunits(asSpecificationA421)orinSIunits(asSpecificationA421M).1.4Thevaluesstatedineitherinch-poundorSIunitsaretoberegardedseparatelyasstandard.Withinthetext,theSIunitsareshowninbrackets.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththespecification.2.ReferencedDocuments2.1ASTMStandards:2A370TestMethodsandDefinitionsforMechanicalTestingofSteelProductsA751TestMethods,Practices,andTerminologyforChemi-calAnalysisofSteelProductsE328TestMethodsforStressRelaxationforMaterialsandStructures2.2MilitaryStandard:3MIL-STD-129MarkingforShipmentandStorage2.3FederalStandard:3Fed.Std.No.123MarkingforShipments(CivilAgencies)3.OrderingInformation3.1Itshallbetheresponsibilityofthepurchaser...
