Designation:A416/A416M−18StandardSpecificationforLow-Relaxation,Seven-WireSteelStrandforPrestressedConcrete1ThisstandardisissuedunderthefixeddesignationA416/A416M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thisspecificationcoverstwogradesoflow-relaxation,seven-wiresteelstrandforuseinprestressedconcretecon-struction.Grade250[1725]andGrade270[1860]haveminimumtensilestrengthsof250ksi[1725MPa]and270ksi[1860MPa],respectively,basedonthenominalareaofthestrand.1.2Asupplementaryrequirement(S1)isprovidedforusewherebondstrengthtestingof0.600-in.[15.24-mm]diameterGrade270[1860]strandforapplicationsinprestressedgroundanchorsisrequiredbythepurchaser.Thesupplementaryrequirementappliesonlywhenspecifiedinthepurchaseorder.1.3Thetextofthisspecificationcontainsnotesorfootnotes,orboth,thatprovideexplanatorymaterial.Suchnotesandfootnotesdonotcontainanymandatoryinformation.1.4Thisspecificationisapplicableforordersineitherinch-poundunits(asSpecificationA416)orinSIunits(asSpecificationA416M).1.5Thevaluesstatedineitherinch-poundunitsorSIunitsaretoberegardedseparatelyasstandard.Withinthetext,theSIunitsareshowninbrackets.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththespecification.1.6Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2A981/A981MTestMethodforEvaluatingBondStrengthfor0.600-in.[15.24-mm]DiameterSte...
