ASTM_A_704_-_A_704M_-_06_2011.pdf

Designation:A704/A704M06(Reapproved 2011)Standard Specification forWelded Steel Plain Bar or Rod Mats for ConcreteReinforcement1This standard is issued under the fixed designation A704/A704M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,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.Scope1.1 This specification covers material in mat(or sheet)formfabricated from hot-rolled,plain steel bars or rods to be usedfor the reinforcement of concrete.Mats consist of two layers ofbars or rods which are assembled by welding at right angles toeach other.1.2 This specification is applicable for orders in eitherinch-pound units(as A704)or in SI units as A704M.1.3 The values stated in either inch-pound units or SI unitsare to be regarded as standard.Within the text,the SI units areshown in brackets.The values stated in each system are notexact equivalents;therefore,each system must be used inde-pendently of the other.Combining values from the two systemsmay result in nonconformance with this specification.2.Referenced Documents2.1 ASTM Standards:2A185/A185M Specification for Steel Welded Wire Rein-forcement,Plain,for ConcreteA615/A615M Specification for Deformed and Plain Carbon-Steel Bars for Concrete ReinforcementA497/A497M Specification for Steel Welded Wire Rein-forcement,Deformed,for ConcreteA700 Practices for Packaging,Marking,and Loading Meth-ods for Steel Products for ShipmentA706/A706M Specification for Low-Alloy Steel Deformedand Plain Bars for Concrete Reinforcement2.2 U.S.Military Standard:3MIL-STD-29 Marking for Shipment and Storage2.3U.S.Federal Standard:3Fed.Std.No.123 Marking for Shipment(Civil Agencies)3.Ordering Information3.1 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:3.1.1 Quantity,no.of mats or area,or both;3.1.2 Size and spacing of steel bars or rods in each direction;3.1.3 Plain bar or rod;3.1.4 Grade required(Grade 40 or 60 280 or 420 asappropriate);3.1.5 Type of steel,as appropriate(see Section 4);and3.1.6 ASTM designation and year of issue.NOTE1A typical ordering description is as follows:1000 welded barmats;Grade 40;to ASTM A704 _.6 by 12 in.;12in.diameter by120 in.longitudinal tip to tip,outer bars spaced 54 in.;12in.diameter by60 in.transverse,outer bars spaced 108 in.1000 welded bar mats;Grade280;to ASTM A704M _.150 by 300 mm;12 mm diameter by3000 mm longitudinal tip-to-tip,outer bars spaced 1350 mm;12 mmdiameter by 1500 mm transverse,outer bars spaced 2750 mm.4.Materials4.1 Plain bars or rods of Grades 40 and 60 280 and 420used in the manufacture of mats shall conform to SpecificationA615/A615M or Specification A706/A706M.4.2 Maximum size of bar and rod material shall be34in.19mm nominal diameter.Minimum size of rod material shall be732in.6 mm nominal diameter.5.Fabrication5.1 Fabricated mats shall be composed of two layers ofplain bars or rods substantially parallel and perpendicular toeach other.5.2 AssemblyMats shall be assembled by means of weld-ing to provide attachment at all intersections.5.2.1 Welded joints shall withstand normal shipping andhandling without becoming broken,but the presence of brokenwelds,regardless of cause,shall not constitute cause forrejection unless the number of broken welds per sheet exceed1This 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.1,2011.Published November 2011.Originallyapproved in 1974.Last previous edition approved in 2006 as A704/A704M 06.DOI:10.1520/A0704_A0704M-06R01.2For 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 website.3Available from Standardization Documents Order Desk,Bldg.4 Section D,700Robbins Ave.,Philadelphia,PA 19111-5094,Attn:NPODS.Or visit:http:/assist.daps.dla.mil/online.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1Copyright by ASTM Intl(all rights reserved);1%of the total,provided that not more than one half of thepermissible maximum number of broken welds are located onany one bar or rod.5.2.2 Welding shall be done in such a manner that theminimum tensile strength,yield strength,and elongation re-quirements for material as described in Section 4 shall be metwhen a specimen is tested across a point of weld.Weld shearstrength requirements shall be in compliance with Section 6.6.Mechanical Requirements6.1 Strength of Connections in Welded Plain Bar or RodMatsIn order to assur