ASTM A704/A704M-19e1

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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Designation:A704/A704M −19
Standard Specification for
Welded Steel Plain Bar or Rod Mats for Concrete
Reinforcement
This standard is issued under the fixed designationA704/A704M; the number immediately following the designation indicates the year
of 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.
ε NOTE—An editorial correction was made to Footnote 1 in December 2019.
1. Scope* A615/A615M SpecificationforDeformedandPlainCarbon-
Steel Bars for Concrete Reinforcement
1.1 This specification covers material in mat (or sheet) form
A706/A706M Specification for Deformed and Plain Low-
fabricated from hot-rolled, plain steel bars or rods to be used
Alloy Steel Bars for Concrete Reinforcement
for the reinforcement of concrete. Mats are made from two
A1064/A1064M Specification for Carbon-Steel Wire and
layers of bars or rods that are assembled by welding the
Welded Wire Reinforcement, Plain and Deformed, for
intersections at right angles to each other.
Concrete
1.2 This specification is applicable for orders in either 3
2.2 AWS Standard:
inch-pound units (as A704) or in SI units [as A704M].
AWS D1.4/D1.4M Structural Welding Code – Steel Rein-
1.3 The values stated in either inch-pound units or SI units
forcing Bars
are to be regarded separately as standard. Within the text, the
2.3 U.S. Military Standard:
SI units are shown in brackets. The values stated in each
MIL-STD-129 Marking for Shipment and Storage
system may not be exact equivalents; therefore, each system
2.4 U.S. Federal Standard:
shall be used independently of the other. Combining values
Fed. Std. No. 123 Marking for Shipment (Civil Agencies)
from the two systems may result in non-conformance with this
specification.
3. Ordering Information
1.4 This specification does not purport to address all of the
3.1 Orders for welded steel plain bar or rod mats for
safety concerns, if any, associated with its use. It is the
concrete reinforcement under this specification shall contain
responsibility of the user of this specification to establish
the following information:
appropriate safety, health, and environmental practices and
3.1.1 Quantity of mats,
determine the applicability of regulatory limitations prior to
3.1.2 Nominal diameter (size), length, and spacing of steel
use.
bars or rods in each direction,
1.5 This international standard was developed in accor-
3.1.3 Plain bar or rod,
dance with internationally recognized principles on standard-
3.1.4 Grade required (Grade 40 or 60 [280 or 420] as
ization established in the Decision on Principles for the
appropriate),
Development of International Standards, Guides and Recom-
3.1.5 Type of steel (see 4.1); and
mendations issued by the World Trade Organization Technical
3.1.6 ASTM designation and year of issue.
Barriers to Trade (TBT) Committee.
NOTE 1—Atypical ordering description is as follows: 1000 welded bar
mats; Grade 40; toASTMA704 – ______. 6 by 12 in.; ⁄2 in. diameter by
2. Referenced Documents
120 in. longitudinal tip to tip, outer bars spaced 54 in.; ⁄2 in. diameter by
2.1 ASTM Standards: 60 in. transverse, outer bars spaced 108 in. [1000 welded bar mats; Grade
280; to ASTM A704M – ______. 150 by 300 mm; 12 mm diameter by
3000 mm longitudinal tip-to-tip, outer bars spaced 1350 mm; 12 mm
diameter by 1500 mm transverse, outer bars spaced 2750 mm].
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
3.2 Thepurchasershallhavetheoptiontospecifyadditional
A01.05 on Steel Reinforcement.
requirements, including but not limited to, the following:
Current edition approved Sept. 1, 2019. Published September 2019. Originally
approved in 1974. Last previous edition approved in 2018 as A704/A704M – 18.
DOI: 10.1520/A0704_A0704M-19E01.
2 3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Available from American Welding Society (AWS), 8669 NW 36 St., #130,
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Miami, FL 33166-6672, http://www.aws.org.
Standards volume information, refer to the standard’s Document Summary page on Available from DLA Document Services, Building 4/D, 700 Robbins Ave.,
the ASTM website. Philadelphia, PA 19111-5094, http://quicksearch.dla.mil.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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A704/A704M−19
3.2.1 Requirements for inspection (10.1), each side. All unit stress determinations shall be based on the
3.2.2 Packaging and special package marking requirements nominal area calculated using the nominal diameter specified.
(Section 12), and 6.3.2 Weldsheartestsfordeterminingconformancewiththe
3.2.3 Other special requirements, if any. requirements of 6.1 shall be conducted with a fixture as
described in Section 19 of Specification A1064/A1064M.
4. Materials
7. Size, Dimensions, and Tolerances
4.1 Plain bars or rods of Grade 40 [280] used in the
7.1 Size and Spacing Dimensions:
fabrication of mats shall conform to Specification A615
7.1.1 The sizes, spacings, dimensions, and arrangement of
[A615M]. Plain bars or rods of Grade 60 [420] used in the
the bar or rod mats shall conform to the design specified by the
fabrication of mats shall conform to Specification A615
purchaser. Bars or rods shall extend beyond exterior intersec-
[A615M] or Specification A706 [A706M].
tions a distance of not less than 1 in. [25 mm]. The spacing of
4.2 Maximum size of bar and rod material shall be ⁄4 in.
bars or rods shall average that specified in the design, and the
[19 mm]nominaldiameter.Minimumsizeofrodmaterialshall
center-to-center spacing between individual bars or rods shall
be ⁄32 in. [6 mm] nominal diameter.
not vary more than ⁄4 in. [6 mm] from that specified.
7.1.2 Where bars or rods of two sizes are used, the nominal
5. Fabrication
area of the smaller size bar shall not be less than 70 % of the
area of the larger size bar.
5.1 Fabricated mats shall be composed of two layers of
plain bars or rods substantially parallel and at right angles to
7.2 Width and Length Tolerances—The overall length or
each other.
width of the mats shall not be more than 1 in. [25 mm] greater
5.2 Assembly—Mats shall be assembled by means of weld- or less than the specified dimension.
ing to provide attachment at all intersections.
8. Finish and Surface Condition
5.2.1 Welded intersections shall withstand normal shipping
and handling without becoming broken, but the presence of
8.1 Fabrica
...