1、Designation:A886/A886M16Standard 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.2.Referenced Documents2.1 ASTM Standard:2A1061/A1061M Test Methods for Testing Multi-Wire SteelPrestressing Strand2.2 U.S.Milita
6、ry 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 helically placed outer
7、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 It shall be the responsibility of the purchaser to specifyall requirements that are necessar
8、y for material ordered underthis specification.Such requirements to be considered include,but are not limited to,the following: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-relaxati
9、on),4.1.5 Other types of indented wire(7.4.2),4.1.6 If joints or splices are permitted(8.1.1),4.1.7 Weldless,if desired(8.1.4),4.1.8 Inspection(11.1),4.1.9 Load-elongation curve,if desired(13.2),4.1.10 Packaging(4.1),and4.1.11 ASTM designation and year of issue.5.Materials and Manufacture5.1 Base Me
10、talThe base metal shall be carbon steel ofsuch quality that when it is drawn to wire,subjected to theindentation 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
11、 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 identity is not necessarily maintained.
12、It is possible that wire frommore than one heat may be used in the manufacture of a reel or reellesspack.Traceability is based on the identity of reels or reelless packs asmaintained and reported by the manufacturer.5.3 IndentationsThe outer wires shall have indentationsthat inhibit longitudinal mov
13、ement of the strand relative 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 Dec.1,2016.Published January 2017.Originallyapprov
14、ed in 1988.Last previous edition approved in 2012 as A886/A886M 12.DOI:10.1520/A0886_A0886M-16.2For 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 Sum
15、mary 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 of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,
16、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 concrete surrounding the strand in prestressed concrete con-struction.Indentations shall conform to the provisions inSection 7.