1、Designation:A910/A910M16Standard Specification forUncoated,Weldless,2-Wire and 3-Wire Steel Strand forPrestressed Concrete1This standard is issued under the fixed designation A910/A910M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision
2、,the year of 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 two types and two grades of2-wire and 3-wire,uncoated steel strand for use in pres
3、tressedconcrete construction.The two types of strand are low-relaxation and stress-relieved(normal-relaxation).Low-relaxation is to be regarded as the standard type.Stress-relieved(normal-relaxation)strand will not be furnished unlessspecifically ordered.The two grades are 250 1725 and 2701860.Grade
4、s 250 1725 and 270 1860 have minimumtensile strengths of 250 ksi 1725 MPa and 270 ksi 1860MPa respectively,based on the nominal area of the strand.1.2 This specification is applicable for orders in eitherinch-pound units(as Specification A910)or in SI units(asSpecification A910M).1.3 The values stat
5、ed in either 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 are not exact equivalents;therefore,each system shallbe used independently of the other.Combining values from thetwo systems may result
6、 in non-conformance with the specifi-cation.2.Referenced Documents2.1 ASTM Standard:2A1061/A1061M Test Methods for Testing Multi-Wire SteelPrestressing Strand2.2 U.S.Military Standard:3MIL-STD-129 Marking for Shipment and Storage2.3 Federal Standard:3Fed.Std.No.123 Marking for Shipments(Civil Agenci
7、es)3.Terminology3.1 Definition of Term Specific to This Specification:3.1.1 strand,nEither two or three wires helically woundaround each other with uniform pitch not less than 12 and notmore than 16 times the nominal diameter of the strand.3.1.1.1 DiscussionThe direction of lay is either right-hande
8、d or left-handed.4.Ordering Information4.1 It shall be the responsibility of the purchaser to specifyall requirements that are necessary for material ordered to thisspecification.Such requirements shall include,but are notlimited to,the following:4.1.1 Quantity(feet metres),4.1.2 Nominal diameter an
9、d description of strand(Table 1),4.1.3 Number of wires(2 or 3),4.1.4 Grade,4.1.5 Type of strand(low-relaxation or stress-relieved(nor-mal relaxation),4.1.6 Inspection(11.1),4.1.7 Load-elongation curve(13.2),4.1.8 Packaging(14.1),and4.1.9 ASTM designation and year of issue.5.Materials and Manufacture
10、5.1 Base MetalThe base metal shall be carbon steel ofsuch quality that when drawn to wire,fabricated into strandand then thermally treated,it shall have the properties andcharacteristics prescribed in this specification.5.2 WireThe wire from which the strand is to be fabricatedshall be round and hav
11、e a dry-drawn finish.NOTE1This product is a composite of two or three wires and isproduced only to meet the prescribed mechanical properties,of which thechemical composition of all wires or any individual wire is not pertinentto this application,and heat identity is not necessarily maintained.It isp
12、ossible that wire from more than one heat may be used in themanufacture of a reel or reelless pack.Traceability is based on the identityof reels or reelless packs as maintained and reported by the manufacturer.5.3 TreatmentAfter stranding,low-relaxation strand shallbe subjected to a continuous therm
13、o-mechanical treatment toproduce the prescribed mechanical properties.For stress-relieved(normal-relaxation)strand,only thermal treatment is1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
14、A01.05 on Steel Reinforcement.Current edition approved Dec.1,2016.Published January 2017.Originallyapproved in 1992.Last previous edition approved in 2012 as A910/A910M 12.DOI:10.1520/A0910_A0910M-16.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service a
15、t serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from U.S.Government Printing Office Superintendent of Documents,732 N.Capitol St.,NW,Mail Stop:SDE,Washington,DC 20401,http:/www.access.gpo.gov.*A Summary
16、of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.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 Technical Barriers to Trade(TBT)Committee.1 necessary.Temper color
