Designation:A911/A911M−15StandardSpecificationforLow-RelaxationSteelBarsforPrestressedConcreteRailroadTies1ThisstandardisissuedunderthefixeddesignationA911/A911M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thisspecificationcoverslow-relaxationsteelbarsforuseinprestressedconcreterailroadties.1.2Thisspecificationisapplicableforordersineitherinch-poundsunits(asSpecificationA911)orinSIunits(asSpecificationA911M).1.3Thevaluesstatedineitherinch-poundunitsorSIunitsaretoberegardedseparatelyasstandard.Withinthetext,theSIunitsareshowninbrackets.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththespecification.2.ReferencedDocuments2.1ASTMStandards:2A370TestMethodsandDefinitionsforMechanicalTestingofSteelProductsE328TestMethodsforStressRelaxationforMaterialsandStructures2.2FederalStandard:3Fed.Std.No.123MarkingforShipments(CivilAgencies)2.3MilitaryStandards:3MIL-STD-129MarkingforShipmentandStorage3.Terminology3.1DefinitionofTermSpecifictoThisSpecification:3.1.1lot,n—allthecoilsofbarsofthesamenominalbarsizecontainedonanindividualshippingreleaseorshippingorder,fromthesameheatofsteel.4.OrderingInformation4.1Ordersforlow-relaxationsteelbarsforprestressedconcreterailroadtiesunderthisspecificationshallcontainthefollowinginformation:4.1.1Quantity(weight)[mass],4.1.2Nominaldiameterofbar(inches)[millimetres],4.1.3Corediameterandlengthofcoils(15.1),4.1.4Packaging,4.1.5SupplementaryRequirementS1(ifdesired),and4.1.6ASTMdesignation(A911[A911M])andyearofissue.4.2Thepurchasershallhavetheoptiontospecifyadditionalrequirements,includingbutnotlimitedto,thefollowing:4.2.1Priorrelaxationtestsofsimilarly-dimensionedbars(7.6.3),4.2.2Inspectionandwitnessingof...
