1、Designation:A820/A820M16Standard Specification forSteel Fibers for Fiber-Reinforced Concrete1This standard is issued under the fixed designation A820/A820M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of last revision.A n
2、umber 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 minimum requirements forsteel fibers intended for use in fiber-reinforced concrete.Fivetypes of steel fibers for
3、 this purpose are defined as pieces ofsmooth or deformed cold-drawn wire;smooth or deformed cutsheet;melt-extracted fibers;mill-cut or modified cold-drawnwire steel fibers that are sufficiently small to be dispersed atrandom in a concrete mixture.1.2 This specification provides for measurement ofdim
4、ensions,tolerances from specified dimensions,and re-quired minimum physical properties,and prescribes testingprocedures to establish conformance to these requirements.1.3 In the case of conflict between a requirement of aproduct specification and a requirement of this specification,the product speci
5、fication shall prevail.In the case of a conflictbetween a requirement of the product specification or arequirement of this specification and a more stringent require-ment of the purchase order,the purchase order shall prevail.The purchase order requirements shall not take precedence ifthey,in any wa
6、y,violate the requirements of the productspecification or this specification;for example,by the waivingof a test requirement or by making a test requirement lessstringent.1.4 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach sy
7、stem may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.2.Referenced Documents2.1 The following documents,of the issue in effect on thedate of material purchase,form a part of
8、this specification tothe extent referenced herein.2.2 ASTM Standards:2A370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA700 Guide for Packaging,Marking,and Loading Methodsfor Steel Products for ShipmentC1116/C1116M Specification for Fiber-Reinforced Concrete2.3 ACI Documents:
9、3ACI 506.1 Guide to Fiber-Reinforced ShotcreteACI 544.1R Committee Report on Fiber-Reinforced Con-crete2.4 U.S.Federal Standards:4Fed.Std.No.123 Marking for Shipment(Civil Agencies)2.5 U.S.Military Standards:4MIL-STD-129 Marking for Shipment and Storage3.Terminology3.1 Definitions of Terms Specific
10、to This Standard:3.1.1 deformed fiber,na fiber that is bent,flattened,orroughened to improve mechanical bond to the concrete matrix.3.1.2 modified fiber,na cold-drawn wire fiber whosecross-section has been changed from circular by shaving thewire.3.1.3 nominal length,nthe length of a deformed fiber,
11、out-to-out,after being deformed.3.1.4 range of equivalent diameter,de-r,na set of limitsplaced on the equivalent diameter by the specifier.See 8.1.6and Note 3.3.2 SymbolsThe following symbols used in this specifi-cation are defined as follows:A=cross-sectional area,in.2mm2d=diameter,in.mmfu=ultimate
12、 tensile strength,psi MPal=length,in.mm=l/d=aspect ratio1This 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 June 1,2016.Published June 20
13、16.Originallyapproved in 1985.Last previous edition approved in 2015 as A820/A820M 15.DOI:10.1520/A0820_A0820M-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 sta
14、ndards Document Summary page onthe ASTM website.3Available from American Concrete Institute(ACI),P.O.Box 9094,FarmingtonHills,MI 48333-9094,http:/www.concrete.org.4Available from Standardization Documents Order Desk,DODSSP,Bldg.4,SectionD,700RobbinsAve.,Philadelphia,PA19111-5098,http:/dodssp.daps.dl
15、a.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 19428-2959.United States1 3.2.1 The subscript n on dimensional units indicates“nomi-nal”and the subscript e indicates“equivalent.”“Nominal”and“eq
16、uivalent”dimensions are calculated from other measurabledimensions or average weight mass.4.Classification4.1 Five general types of steel fibers are identified in thisspecification based upon the product or process used as asource of the steel fiber material.4.1.1 Type I,cold-drawn wire.4.1.2 Type II,cut sheet.4.1.3 Type III,melt-extracted.4.1.4 Type IV,mill cut.4.1.5 Type V,modified cold-drawn wire.4.2 Fibers shall be straight or deformed.5.Ordering Information5.1 Orders for steel fibers under
