1、Designation:A416/A416M18Standard Specification forLow-Relaxation,Seven-Wire Steel Strand for PrestressedConcrete1This standard is issued under the fixed designation A416/A416M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year
2、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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope*1.1 This specification covers two gra
3、des of low-relaxation,seven-wire steel strand for use in prestressed concrete con-struction.Grade 250 1725 and Grade 270 1860 haveminimum tensile strengths of 250 ksi 1725 MPa and 270 ksi1860 MPa,respectively,based on the nominal area of thestrand.1.2 A supplementary requirement(S1)is provided for u
4、sewhere bond strength testing of 0.600-in.15.24-mm diameterGrade 270 1860 strand for applications in prestressed groundanchors is required by the purchaser.The supplementaryrequirement applies only when specified in the purchase order.1.3 The text of this specification contains notes or footnotes,or
5、 both,that provide explanatory material.Such notes andfootnotes do not contain any mandatory information.1.4 This specification is applicable for orders in eitherinch-pound units(as Specification A416)or in SI units(asSpecification A416M).1.5 The values stated in either inch-pound units or SI unitsa
6、re 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-conformance with thespecificati
7、on.1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers
8、to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2A981/A981M Test Method for Evaluating Bond Strength for0.600-in.15.24-mm Diameter Steel Prestressing Strand,Grade 270 1860,Uncoated,Used in Prestressed GroundAnchorsA1061/A1061M Test Methods for Testing Multi-Wire SteelPrestressing Str
9、and2.2 U.S.Military Standard:3MIL-STD-129 Marking for Shipment and Storage2.3 U.S.Federal Standard:3Fed.Std.No.123 Marking for Shipments(Civil Agencies)3.Terminology3.1 Definition of Term Specific to This Specification:3.1.1 lay length,nthe axial distance required to make onecomplete revolution of a
10、ny outer wire of a strand.3.1.2 strand,na group of wires having a center wireenclosed tightly by six helically placed outer wires.3.1.2.1 DiscussionThe direction of lay is either right-handed or left-handed.3.1.3 strand splice,na production connection betweentwo separate lengths of strand never inte
11、nded to carry pre-stressing loads.3.1.4 wire weld,na resistance butt-weld joining twoseparate lengths of wire after wire drawing and before the wireis formed into strand.4.Ordering Information4.1 Orders for low-relaxation seven-wire steel strand underthis specification shall contain the following in
12、formation:4.1.1 Quantity(feet metres),4.1.2 Nominal diameter of strand(inches millimetres),4.1.3 Grade of strand,and1This 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 Reinforc
13、ement.Current edition approved Dec.1,2018.Published January 2019.Originallyapproved in 1957.Last previous edition approved in 2017 as A416/A416M 17a.DOI:10.1520/A0416_A0416M-18.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For A
14、nnual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from DLA Document Services,Building 4/D,700 Robbins Ave.,Philadelphia,PA 19111-5094,http:/quicksearch.dla.mil.*A Summary of Changes section appears at the end of this standardCop
15、yright 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
16、 Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 4.1.4 ASTM designation A416 A416M and year of issue.4.2 The purchaser shall have the option to specify additionalrequirements,including but not limited to,the following:4.2.1 Relaxation evidence for similarly dimensioned strandof the same grade(6.5.1),4.2.2 Specially dimensioned strand(7.5),4.2.3 Whether strand splices are permitted(8.1.1),4.2.4 Weldless strand(8.2.2),4.2.5 Re
