1、Designation:A881/A881M16aStandard Specification forSteel Wire,Indented,Low-Relaxation for PrestressedConcrete1This standard is issued under the fixed designation A881/A881M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of
2、last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This specification covers indented,low-relaxation steelwire for use in prestressed concrete.1.2 The values stated in eith
3、er inch-pound units or SI unitsare to be regarded separately as standard.Within the text,theSI units are shown in brackets.The values stated in eachsystem may not be exact equivalents;therefore,each systemshall be used independently of the other.Combining valuesfrom the two systems may result in non
4、-conformance with thespecification.2.Referenced Documents2.1 ASTM Standards:2A370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA421/A421M Specification for Stress-Relieved Steel Wirefor Prestressed ConcreteA700 Guide for Packaging,Marking,and Loading Methodsfor Steel Products
5、for Shipment2.2 U.S.Military Standard:3MIL-STD-129 Marking for Shipment and Storage2.3 U.S.Federal Standard:3Fed.Std.No.123 Marking for Shipment(Civil Agencies)3.Terminology3.1 Definitions of Terms Specific to This Specification:3.1.1 indented steel wire,nindented,cold-drawn,low-relaxation wire,the
6、wire surface having indentations thatreduce longitudinal movement of the wire while also providingconsistent prestress transfer length.3.1.2 low-relaxation wire,nstraightened wire that re-ceives a suitable continuous thermo-mechanical treatment asthe last operation to produce the properties listed.4
7、.Ordering Information4.1 Orders for indented low-relaxation steel wire for pre-stressed concrete shall include the following necessary infor-mation:4.1.1 Quantity(weight mass),4.1.2 Required minimum tensile strength(6.2),4.1.3 Nominal diameter(6.1),4.1.4 Packaging,and4.1.5 ASTM designation and year
8、of issue.4.2 The purchaser shall have the option to specify additionalrequirements,including but not limited to,the following:4.2.1 Indentation geometry(7.2,7.3),4.2.2 Indentation sidewall angle(7.3,7.4),4.2.3 Welding of rod prior to cold drawing permissible(9.3),4.2.4 Outside inspection(11.1),4.2.5
9、 Special packaging(14.1,14.2),and4.2.6 Other special requirements,if any.5.Materials and Manufacture5.1 The steel shall be made by any commercially acceptedsteelmaking process.5.2 The base metal shall be carbon steel of such quality thatwhen drawn to wire,indented,and then thermo-mechanicallytreated
10、,shall have the properties and characteristics prescribedin this specification.6.Mechanical Property Requirements6.1 GeneralIndented wire shall be supplied in coils,packs,or spools to the specified mechanical properties in Table1.It shall be permissible to furnish diameters of wire notspecifically i
11、temized in this specification,provided that thestrength is defined and they conform otherwise to the require-ments of this specification.6.2 Tensile StrengthThe minimum tensile strength of theindented wire shall conform to the requirements of Table 1.Other values of tensile strength and nominal diam
12、eters can be1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.05 on Steel Reinforcement.Current edition approved Dec.1,2016.Published January 2017.Originallyapproved in 1990.Last previou
13、s edition approved in 2016 as A881/A881M 16.DOI:10.1520/A0881_A0881M-16A.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM w
14、ebsite.3Available from Standardization Documents Order Desk,DODSSP,Bldg.4,SectionD,700RobbinsAve.,Philadelphia,PA19111-5098,http:/dodssp.daps.dla.mil.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 1
15、9428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Techn
16、ical Barriers to Trade(TBT)Committee.1 specified if shown by test that the strength exceeds thatspecified.The tension test shall be made in accordance withTest Methods A370.6.3 Load at 1%ExtensionThe load at 1%extension shallbe at least 90%of the minimum specified tensile strengthwhen tested in accordance with Test Methods A370.6.4 ElongationThe percent elongation after fracture on a10-in.250-mm gage length shall be 3.0%minimum.6.5 Bend TestA 90 degree bend test(see Fig.1)around apin six times t
