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ASTM A704/A704M-06(2011)

(Specification)

Standard Specification for Welded Steel Plain Bar or Rod Mats for Concrete Reinforcement

Standard Specification for Welded Steel Plain Bar or Rod Mats for Concrete Reinforcement

ABSTRACT
This specification covers materials in mat (or sheet) form fabricated from hot-rolled, plain steel bars or rods to be used for the reinforcement of concrete. Mats consist of two layers of bars or rods that are assembled by welding at right angles to each other. Welding shall be done in such a way that the minimum tensile strength, yield strength, and elongation requirements shall be met. Tension and shear tests shall be performed to meet the required strength and elongation properties and maximum size of a bar or rod material. A retest shall be performed when a specimen fails to meet the specified requirements. All tests and inspections shall be made at the place of fabrication prior to shipment, unless otherwise specified, and shall be so conducted as not to interfere unnecessarily with fabricating operations.
SCOPE
1.1 This specification covers material in mat (or sheet) form fabricated from hot-rolled, plain steel bars or rods to be used for the reinforcement of concrete. Mats consist of two layers of bars or rods which are assembled by welding at right angles to each other.  
1.2 This specification is applicable for orders in either inch-pound units (as A704) or in SI units [as A704M].
1.3 The values stated in either inch-pound units or SI units are to be regarded as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with this specification.

General Information

Status
Historical
Publication Date
31-Oct-2011
ICS
77.140.15 - Steels for reinforcement of concrete
Technical Committee
A01 - Steel, Stainless Steel and Related Alloys
Drafting Committee
A01.05 - Steel Reinforcement
Current Stage
Ref Project

Relations

Replaces
ASTM A704/A704M-06 - Standard Specification for Welded Steel Plain Bar or Rod Mats for Concrete Reinforcement
Effective Date
01-Nov-2011
Replaced By
ASTM A704/A704M-17 - Standard Specification for Welded Steel Plain Bar or Rod Mats for Concrete Reinforcement
Effective Date
01-Sep-2017

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ASTM A704/A704M-06(2011) - Standard Specification for Welded Steel Plain Bar or Rod Mats for Concrete ReinforcementASTM A704/A704M-06(2011) - Standard Specification for Welded Steel Plain Bar or Rod Mats for Concrete Reinforcement
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ASTM A704/A704M-06(2011) - Standard Specification for Welded Steel Plain Bar or Rod Mats for Concrete Reinforcement
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:A704/A704M −06 (Reapproved 2011)
Standard Specification for
Welded Steel Plain Bar or Rod Mats for Concrete
1
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.
4
1. Scope 2.2 U.S. Military Standard:
MIL-STD-29 Marking for Shipment and Storage
1.1 This specification covers material in mat (or sheet) form
4
2.3 U.S. Federal Standard:
fabricated from hot-rolled, plain steel bars or rods to be used
Fed. Std. No. 123 Marking for Shipment (Civil Agencies)
for the reinforcement of concrete. Mats consist of two layers of
bars or rods which are assembled by welding at right angles to
3. Ordering Information
each other.
3.1 It shall be the responsibility of the purchaser to specify
1.2 This specification is applicable for orders in either
all requirements that are necessary for material ordered to this
inch-pound units (as A704) or in SI units [as A704M].
specification. Such requirements shall include, but are not
limited to, the following:
1.3 The values stated in either inch-pound units or SI units
3.1.1 Quantity, no. of mats or area, or both;
are to be regarded as standard. Within the text, the SI units are
3.1.2 Sizeandspacingofsteelbarsorrodsineachdirection;
shown in brackets. The values stated in each system are not
3.1.3 Plain bar or rod;
exact equivalents; therefore, each system must be used inde-
3.1.4 Grade required (Grade 40 or 60 [280 or 420] as
pendentlyoftheother.Combiningvaluesfromthetwosystems
appropriate);
may result in nonconformance with this specification.
3.1.5 Type of steel, as appropriate (see Section 4); and
3.1.6 ASTM designation and year of issue.
2. Referenced Documents
NOTE 1—Atypical ordering description is as follows: 1000 welded bar
2
2.1 ASTM Standards:
1
mats; Grade 40; toASTM A704 – ______. 6 by 12 in.; ⁄2 in. diameter by
1
A185/A185M Specification for Steel Welded Wire
120 in. longitudinal tip to tip, outer bars spaced 54 in.; ⁄2 in. diameter by
3
60 in. transverse, outer bars spaced 108 in. [1000 welded bar mats; Grade
Reinforcement, Plain, for Concrete (Withdrawn 2013)
280; to ASTM A704M – ______. 150 by 300 mm; 12 mm diameter by
A615/A615M Specification for Deformed and Plain Carbon-
3000 mm longitudinal tip-to-tip, outer bars spaced 1350 mm; 12 mm
Steel Bars for Concrete Reinforcement
diameter by 1500 mm transverse, outer bars spaced 2750 mm].
A497/A497M Specification for Steel Welded Wire
Reinforcement, Deformed, for Concrete (Withdrawn
4. Materials
3
2013)
4.1 Plain bars or rods of Grades 40 and 60 [280 and 420]
A700 Practices for Packaging, Marking, and Loading Meth-
used in the manufacture of mats shall conform to Specification
ods for Steel Products for Shipment
A615/A615M or Specification A706/A706M.
A706/A706M Specification for Low-Alloy Steel Deformed
3
4.2 Maximumsizeofbarandrodmaterialshallbe ⁄4in.[19
and Plain Bars for Concrete Reinforcement
mm] nominal diameter. Minimum size of rod material shall be
7
⁄32 in. [6 mm] nominal diameter.
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
5. Fabrication
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
A01.05 on Steel Reinforcement.
5.1 Fabricated mats shall be composed of two layers of
Current edition approved Nov. 1, 2011. Published November 2011. Originally
plain bars or rods substantially parallel and perpendicular to
approved in 1974. Last previous edition approved in 2006 as A704/A704M – 06.
each other.
DOI: 10.1520/A0704_A0704M-06R11.
2
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’s Document Summary page on
4
the ASTM website. Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700
3
The last approved version of this historical standard is referenced on Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS. Or visit: http://
www.astm.org. assist.daps.dla.mil/online.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
A704/A704M−06 (2011)
5.2 Assembly—Mats shall be assembled by means of weld- 7.2 Width and Length Tolerances—The overall length or
ing to provide attachment at all intersections. width of the mats shall not be more than 1 in. [25 mm] greater
or less than the specified dimension.
5.2.1 Welded joints shall withstand normal shipping and
handling without becoming broken,
...

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This specification covers deformed and plain steel reinforcing bars with protective epoxy coating applied by the electrostatic spray method. The surface of the steel reinforcing bars to be coated shall be cleaned by abrasive blast cleaning to near-white metal. The number and frequency of tests for coating thickness, continuity, flexibility and adhesion are specified. If the specimen for coating thickness or flexibility fails to meet the specified requirements, two retests on random samples shall be conducted for each failed test.
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1.1 This specification covers deformed and plain steel reinforcing bars with protective epoxy coating applied by the electrostatic spray method.
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This specification covers deformed and plain carbon-steel bars for concrete reinforcements in cut lengths and coils. Materials considered under this specification are available in Grades 40 [280], 60 [420] and 75 [520]. Steel samples shall be rolled from properly identified heats of mold cast or strand cast steel using electric-furnace, basic-oxygen, or open-hearth. Heat analysis shall be performed wherein steel materials shall conform to required compositions of carbon, manganese, phosphorus and sulfur. Steel specimens shall also undergo tensile tests and shall conform to required values of tensile strength, yield strength, and elongation. Steel samples shall also undergo deformation test, tension test and bend tests. Final products shall be marked by a tag.
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1.1 This specification covers deformed and plain carbon-steel bars in cut lengths and coils for concrete reinforcement. Annex A2 of this specification covers deformed bars for use for other applications. Steel bars containing alloy additions, such as with the Association for Iron and Steel Technology and the Society of Automotive Engineers series of alloy steels, are permitted if the resulting product meets all the other requirements of this specification. The standard sizes and dimensions of deformed bars and their number designations are given in Table 1.    
1.2 Unless specified for use for other applications in Annex A2, bars are of four minimum yield strength levels: namely, 40 000 psi [280 MPa], 60 000 psi [420 MPa], 80 000 psi [550 MPa], and 100 000 psi [690 MPa], designated as Grade 40 [280], Grade 60 [420], Grade 80 [550], and Grade 100 [690], respectively.
Note 1: Grade 100 [690] reinforcing bars were introduced in this specification in 2015. In contrast to the lower grades, which have ratios of specified tensile strength to specified yield strength that range from 1.25 to 1.50, Grade 100 [690] reinforcing bars have a ratio of specified tensile strength to specified yield strength of 1.15. Users of this specification should be aware that there will, therefore, be a lower margin of safety and reduced warning of failure following yielding when Grade 100 [690] bars are used in structural members where strength is governed by the tensile strength of the reinforcement, primarily in beams and slabs. As a result of the lower specified tensile strength to specified yield strength ratio of 1.15 for Grade 100 [690], users of this specification should be aware that ACI 318 Type 1 mechanical and welded splice requirements found in many acceptance criteria of 125 % of specified yield strength requirements in tension and compression are not applicable to Grade 100 [690]. Mechanical and welded splices should meet a minimum specified tensile strength of 115 000 psi [790 MPa] for Grade 100 [690].
Note 2: Users of this specification need to be aware that consensus design codes and specifications may not recognize the use of the No. 20 [64] bar, the largest bar included in this specification. Structural members reinforced with No. 20 [64] bars may require approval of the building official or other appropriate authority and require special detailing to ensure adequate performance at service and factored loads.  
1.3 Plain bars, in sizes up to and including 21/2 in. [63.5 mm] in diameter in coils or cut lengths, when ordered shall be furnished under this specification in Grade 40 [280], Grade 60 [420], Grade 80 [550], and Grade 100 [690]. For ductility properties (elongation and bending), test provisions of the nearest smaller nominal diameter deformed bar size shall apply. Requirements providing for deformations and marking shall not be applicable.  
Note 3: Welding of the material in this specification should be approached with caution since no specific provisions have been included to enhance its weldability. When this steel is to be welded, a welding procedure suitable for the chemical composition and intended use or service should be used. T...

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ASTM
ASTM A421/A421M-21(Specification)
Standard Specification for Stress-Relieved Steel Wire for Prestressed Concrete

ABSTRACT
This specification covers two types of uncoated stress-relieved round high-carbon steel wire commonly used in prestressed linear concrete construction. These two types are the type BA used for applications in which cold-end deformation is used for anchoring purposes and type WA wire which is used for application in which the ends are anchored by wedges, no cold-end deformation of the wire is involved. Required tensile strength, yield strength, and elongation shall be evaluated using stress-relaxation test. Heat analysis shall be used to determine the percentage of specified elements especially sulfur and phosphorus to meet the required chemical composition.
SCOPE
1.1 This specification covers two types of stress-relieved round high-carbon steel wire used in prestressed concrete construction, as follows:  
1.1.1 Type BA wire is used for applications in which cold-end deformation is used for anchoring purposes (Button Anchorage), and  
1.1.2 Type WA wire is used for application in which the ends are anchored by wedges, and no cold-end deformation of the wire is involved (Wedge Anchorage).  
1.2 A supplementary requirement (S1) is provided for use where low-relaxation wire and relaxation testing for that product is required by the purchaser. The supplementary requirement applies only when specified in the purchase order or contract.  
1.3 This specification is applicable for orders in either inch-pounds units (as Specification A421) or in SI units (as Specification A421M).  
1.4 The values stated in either inch-pound 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 may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the specification.  
1.5 The text of this specification references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables) shall not be considered as requirements of the specification.  
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.

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