1、Designation:A886/A886M17Standard Specification forSteel Strand,Indented,Seven-Wire Stress-Relieved forPrestressed Concrete1This standard is issued under the fixed designation A886/A886M;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 ofindented seven-wire uncoated,steel strand for use in pr
3、e-stressed concrete construction.The two types of strand arelow-relaxation and stress-relieved(normal-relaxation).Grade250I 1725I and Grade 270I 1860I have minimum tensilestrengths of 250 ksi 1725 MPa and 270 ksi 1860 MPa,respectively,based on the nominal area of the strand.1.2 This specification is
4、 applicable for orders in eitherinch-pound units(as Specification A886)or in SI units(asSpecification A886M).1.3 The values stated 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
5、 exact equivalents;therefore,each system shallbe used independently of the other.Combining values from thetwo systems may result in non-conformance with the specifi-cation.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization esta
6、blished in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standard:2A1061/A1061M Test Methods for Testing Multi-Wire SteelPrestressing
7、Strand2.2 U.S.Military Standard:MIL-STD-129 Marking for Shipment and Storage32.3 U.S.Federal Standard:Fed.Std.No.123 Marking for Shipments(Civil Agencies)33.Terminology3.1 Definition of Term Specific to this Specification:3.1.1 strand,na group of wires having a center wireenclosed tightly by six hel
8、ically placed outer wires withuniform pitch of not less than 12 and not more than 16 timesthe nominal diameter of the strand.3.1.1.1 DiscussionThe direction of lay is either right-handed or left-handed.4.Ordering Information4.1 Orders for indented seven-wire steel strand under thisspecification shal
9、l contain the following information:4.1.1 Quantity(feet metres),4.1.2 Nominal diameter of strand(inches millimetres),4.1.3 Grade of strand,4.1.4 Type of strand(low-relaxation or stress-relieved(normal-relaxation),and4.1.5 ASTM designation A886 A886M and year of issue.4.2 The purchaser shall have the
10、 option to specify additionalrequirements,including but not limited to,the following:4.2.1 Relaxation evidence from similarly dimensionedstrand of the same grade(6.5.1),4.2.2 Other types of indented wire(7.4.2),4.2.3 If joints or splices are permitted(8.1.1),4.2.4 Weldless,if desired(8.1.4),4.2.5 Re
11、quirements for inspection(11.1),4.2.6 Load-elongation curve,if desired(13.2),4.2.7 Packaging and package marking(Section 14),and4.2.8 Other special requirements,if any.5.Materials and Manufacture5.1 Base MetalThe base metal shall be carbon steel ofsuch quality that when it is drawn to wire,subjected
12、 to the1This 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 Nov.1,2017.Published November 2017.Originallyapproved in 1988.Last previous ed
13、ition approved in 2016 as A886/A886M 16.DOI:10.1520/A0886_A0886M-17.2For 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 websit
14、e.3Available from U.S.Government Printing Office,Superintendent ofDocuments,732 N.Capitol St.,NW,Washington,DC 20401-0001,http:/www.access.gpo.gov.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 1942
15、8-2959.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 Technica
16、l Barriers to Trade(TBT)Committee.1 indentation process,fabricated into strand,and then thermallytreated,it shall have the properties and characteristics pre-scribed in this specification.5.2 WireThe wire from which the strand is to be fabricatedshall have a common dry-drawn finish.NOTE1This product is a composite of seven wires and is produced toonly the prescribed mechanical properties.The chemical composition ofall wires or any individual wire is not pertinent to this application,andheat iden
