ASTM A184/A184M-19

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of the standard as published by ASTM is to be considered the official document.
Designation: A184/A184M − 17 A184/A184M − 19
Standard Specification for
Welded Deformed Steel Bar Mats for Concrete
Reinforcement
This standard is issued under the fixed designation A184/A184M; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope*
1.1 This specification covers material in mat (or sheet) form fabricated from deformed steel bars to be used for the reinforcement
of concrete. Mats consist of are made from two layers of bars that are assembled by welding the intersections at right angles to
each other. Mats are assembled by welding at the intersections.
1.2 This specification is applicable for orders in either inch-pound units (as Specification A184) or SI units (as Specification
A184M).
1.3 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units
are shown in brackets. The values stated in each system aremay not be exact equivalents; therefore, each system mustshall be used
independently of the other. Combining values from the two systems may result in nonconformancenon-conformance with this
specification.
1.4 The text of this specification references notes and footnotes that provide explanatory material. These notes and footnotes
(excluding those in tables and figures) shall not be considered as requirements of the specification.
1.5 This specificationstandard does not purport to address all of the safety concerns, if any, associated with its use. It is the
responsibility of the user of this specificationstandard to establish appropriate safety, health, and environmental practices and
determine the applicability of regulatory limitations prior to use.
1.6 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.
2. Referenced Documents
2.1 ASTM Standards:
A615/A615M Specification for Deformed and Plain Carbon-Steel Bars for Concrete Reinforcement
A700 Guide for Packaging, Marking, and Loading Methods for Steel Products for Shipment
A706/A706M Specification for Deformed and Plain Low-Alloy Steel Bars for Concrete Reinforcement
2.2 AWS Standard:
AWS D1.4/D1.4M Structural Welding Code – Steel Reinforcing Bars
2.3 U.S. Military Standard:
MIL-STD-129 Marking for Shipment and Storage
2.4 U.S. Federal Standard:
Fed Std No. 123 Marketing for Shipments (Civil Agencies)
This specification is under the jurisdiction of ASTM Committee A01 on Steel, Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee A01.05
on Steel Reinforcement.
Current edition approved Sept. 1, 2017Sept. 1, 2019. Published September 2017September 2019. Originally approved in 1936. Last previous edition approved in 20112017
as A184/A184M – 06 (2011).A184/A184M – 17. DOI: 10.1520/A0184_A0184M-17.10.1520/A0184_A0184M-19.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’sstandard’s Document Summary page on the ASTM website.
Available from American Welding Society (AWS), 8669 NW 36 St., #130, Miami, FL 33166-6672, http://www.aws.org.
Available 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 standard
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A184/A184M − 19
3. Ordering Information
3.1 Orders for welded steel bar mats for concrete reinforcement under this specification shall contain the following information:
3.1.1 Quantity of mats,
3.1.2 Bar designation number (size), length, and spacing of bars in each direction,
3.1.3 Grade required (Grade 40 or 60) [280 or 420],
3.1.4 Type of steel (see Section 4.1), and
3.1.5 ASTM designation A184/A184Mand year of issue.
NOTE 1—A typical ordering description is as follows: 1000 bar mats to ASTM A184– ; fabricated from Grade 40 bars to ASTM A615– ; 6 by 6 in.;
No. 4 by 120 in. longitudinal tip to tip, outer bars spaced 54 in.; No. 3 by 60 in. transverse, outer bars spaced 114 in.
[1000 bar mats to ASTM A184M– ; fabricated from Grade 280 bars to ASTM A615M– ; 150 by 150 mm; No. 10 by 3000 mm longitudinal tip to
tip, outer bars spaced 1350 mm; No. 10 by 1500 mm transverse, outer bars spaced 2850 mm.]
3.2 The purchaser shall have the option to specify additional requirements, 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), and
3.2.3 Other special requirements, if any.
4. Materials and Manufacture
4.1 Deformed steel bars of Grades 40 [280] used in the manufacture of welded mats shall conform to Specification A615
[A615M]. Deformed steel bars of Grade 60 [420] used in the manufacture of welded mats shall conform to Specification A615
[A615M] or A706 [A706M].
5. Fabrication
5.1 Fabricated mats shall be composed of two layers of bars substantially parallel and perpendicular to each other.
5.1.1 Mats shall be assembled by means of welding to provide attachment at intersections.
5.1.1.1 Welds shall provide attachment at all exterior intersections and at not less than alternate interior intersections.
5.1.1.2 The separation of 5 % or less of all welded intersections of any mat shall not be cause for rejection provided that no
more than halfone-half of the welds on any one bar are separated.
5.1.1.3 Welding shall be performed in such a manner that accordance with AWS D1.4/D1.4M and the strength and
ductilityelongation requirements of the material specifications specifications for reinforcing bars in Section 4 are shall be met when
a specimen is tested across a point of weld. Bend tests shall be performed on specimens taken from between the welds.
NOTE 2—Welding of the mat intersections has generally been performed without problems, but care should be taken when welding reinforcing bars
with carbon equivalent levels above 0.55 %, in order to prevent cracking in the weld area.
6. Mechanical Properties
6.1 Mats shall be capable of withstanding a static load of 150 lbf [670 N] exerted perpendicular to the plane of the mat tending
to separate the bars with no apparent loosening when applied to one intersection of the connected bars.
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