1、Designation: A704/A704M 17Standard 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 ye
2、ar 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 material in mat (or sheet) formfabricated from hot-rolled, plain steel bars or rods t
3、o 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 uni
4、ts 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 sp
5、ecification.1.4 This specification does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this specification to establishappropriate safety, health and environmental practices anddetermine the applicability of regulatory limitat
6、ions prior touse.1.5 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 Tec
7、hnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2A615/A615M Specification for Deformed and Plain Carbon-Steel Bars for Concrete ReinforcementA700 Guide for Packaging, Marking, and Loading Methodsfor Steel Products for ShipmentA706/A706M Specification for Deformed an
8、d Plain Low-Alloy Steel Bars for Concrete ReinforcementA1064/A1064M Specification for Carbon-Steel Wire andWelded Wire Reinforcement, Plain and Deformed, forConcrete2.2 U.S. Military Standard:3MIL-STD-29 Marking for Shipment and Storage2.3 U.S. Federal Standard:3Fed. Std. No. 123 Marking for Shipmen
9、t (Civil Agencies)3. Ordering Information3.1 Orders for welded steel plain bar or rod mats forconcrete reinforcement under this specification shall containthe following information:3.1.1 Quantity of mats,3.1.2 Bar designation number (size), length, and spacing ofsteel bars or rods in each direction,
10、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 (see Section 4.1); and3.1.6 ASTM designation and year of issue.NOTE 1A typical ordering description is as follows: 1000 welded barmats; Grade 40; to ASTM A704 _. 6 by 12 in.;12 in. diameter by12
11、0 in. longitudinal tip to tip, outer bars spaced 54 in.;12 in. 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, out
12、er bars spaced 2750 mm.3.2 The purchaser shall have the option to specify additionalrequirements, including but not limited to, the following:3.2.1 Requirements for inspection (10.1),3.2.2 Packaging and special package marking requirements(Section 12), and3.2.3 Other special requirements, if any.1Th
13、is 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 Sept. 1, 2017. Published September 2017. Originallyapproved in 1974. Last previous editi
14、on approved in 2011 as A704/A704M 06(2011). DOI: 10.1520/A0704_A0704M-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 A
15、STM 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 standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959
16、. 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 Ba
17、rriers to Trade (TBT) Committee.14. 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 be34 in. 19mm nominal diameter. Minimum size of rod m
18、aterial shall be732 in. 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
19、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 exceed1 % of the total, provided that not more than one half of thepermissible maximum
20、 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
21、 requirements shall be in compliance with Section 6.6. Mechanical Requirements6.1 Strength of Connections in Welded Plain Bar or RodMatsIn order to assure adequate weld shear strength betweenlongitudinal and transverse bar or rod, weld shear strengthtests, as described in 6.3.2, shall be made. The m
22、inimumaverage shear value shall not be less than 25 000 lbf 172 Nmultiplied by the nominal area of the larger bar or rod in in.2mm2.6.2 Number of Tests:6.2.1 One bar or rod of each size or grade to be used in thefabrication of the mat shall be tested for conformance with theprovisions of 4.1 or 4.2
23、for each 75 000 ft27000 m2 of matsor fraction thereof.6.2.2 One sample consisting of longitudinal bars or rodswith not less than two connections on the same transverse baror rod shall be taken and tested for conformance with theprovisions of 5.2.2 and 6 from each 75 000 ft27000 m2ofmats or fractions
24、 thereof.6.3 Test Methods:6.3.1 Tension test specimens for determining conformancewith 5.2.2 shall have a welded joint located approximately atthe center of the bar or rod being tested, and the cross bar orrod shall extend approximately 1 in. 25 mm beyond eachside. All unit stress determinations sha
25、ll be based on thenominal area calculated using the nominal diameter specified.6.3.2 Weld shear tests for determining conformance with therequirements of 6.1 shall be conducted with a fixture asdescribed in Section 19 of Specification A1064/A1064M.7. Size, Dimensions, and Tolerances7.1 Size and Spac
26、ing Dimensions:7.1.1 The sizes, spacings, dimensions, and arrangement ofthe bar or rod mats shall conform to the design specified by thepurchaser. Bars or rods shall extend beyond exterior intersec-tions a distance of not less than 1 in. 25 mm. The spacing ofbars or rods shall average that specified
27、 in the design, and thespace between individual bars or rods shall not vary more than14 in. 6 mm from that specified.7.1.2 Where bars or rods of two sizes are used, the nominalarea of the smaller size shall not be less than 70 % of the areaof the larger size.7.2 Width and Length TolerancesThe overal
28、l length orwidth of the mats shall not be more than 1 in. 25 mm greateror less than the specified dimension.8. Finish and Surface Condition8.1 The finished mats shall be free of injurious defects inmaterial or workmanship.8.2 Rust, seams, surface irregularities, or mill scale shall notbe cause for r
29、ejection provided the weight, dimensions, cross-sectional area, and tensile properties of a hand wire brushedtest specimen are not less than the requirements of thisspecification.9. Rejection and Retests9.1 Fabricated mats that do not meet the requirements ofthis specification shall be rejected and
30、reported to the manu-facturer within 5 working days from the receipt of samples bythe purchaser.9.2 When a test specimen fails to meet the provisions of5.2.2, two additional samples shall be selected and tested. Allretest specimens shall meet the requirements of this specifica-tion.9.3 When a test s
31、pecimen fails to meet the provisions of 6.1,all of the remaining welds on the transverse member shall betested and the average of all tests (including the original test)shall meet the requirements specified in 6.1.10. Inspection and Test Reports10.1 Inspection of the welded steel bar or rod mats sha
32、ll beagreed upon between the purchaser and the manufacturer aspart of the purchase order or contract.10.2 Test Reports on BarsThe manufacturer shall supplytest reports showing that the bars used in the fabrication of themats have satisfied the tension and bend test requirements ofthe specified type
33、and grade in accordance with Section 4. Thereports shall show the manufacturers test identificationnumbers, including the identity of the bars.10.3 A material test report, certificate of inspection, orsimilar document printed from or used in electronic form froman electronic data interchange (EDI) t
34、ransmission shall beregarded as having the same validity as a counterpart printed inthe certifiers facility. The content of the EDI transmitteddocument shall meet the requirements of the invoked ASTMA704/A704M 172standard(s) and conform to any existing EDI agreement be-tween the purchaser and the ma
35、nufacturer. Notwithstanding theabsence of a signature, the organization submitting the EDItransmission is responsible for the content of the report.NOTE 2The industry definition as invoked here is: EDI is thecomputer-to-computer exchange of business information in a standardformat such as ANSI ASC X
36、12.11. Rehearing11.1 Samples tested in accordance with this specificationthat represent rejected material shall be preserved for twoweeks from the date rejection is reported to the manufacturer.In case of dissatisfaction with the results of the tests, themanufacturer may make claim for a hearing wit
37、hin that time.12. Packaging and Package Marking12.1 Packaging, marking, and loading for shipment shall bein accordance with Practices A700.12.2 When specified in the contract or order, and for directprocurement by or direct shipment to the U.S. Government,marking for shipment, in addition to require
38、ments specified inthe contract or order, shall be in accordance with MIL-STD-29for military agencies and with Fed. Std. No. 123 for civilagencies.12.3 Each bundle of mats shall be marked with a suitabletag showing the order number, name of the manufacturer, size,and grade of the material used.13. Ke
39、ywords13.1 concrete reinforcement; mats; steel bars; steel rodsSUMMARY OF CHANGESCommittee A01 has identified the location of selected changes to this standard since the last issue(A704/A704M 06 (2011) that may impact the use of this standard. (Approved Sept. 1, 2017.)(1) Revised 2.1, Section 3, 6.3
40、.2, and Section 10.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement
41、of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for
42、 additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known
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44、t the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 173
