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ASTM A704/A704M-96

(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

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. The mats shall 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 A 704) or in SI units [as A 704M].
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
09-Sep-2001
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

Replaced By
ASTM A704/A704M-01 - Standard Specification for Welded Steel Plain Bar or Rod Mats for Concrete Reinforcement
Effective Date
10-Sep-2001

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ASTM A704/A704M-96 - Standard Specification for Welded Steel Plain Bar or Rod Mats for Concrete ReinforcementASTM A704/A704M-96 - Standard Specification for Welded Steel Plain Bar or Rod Mats for Concrete Reinforcement
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ASTM A704/A704M-96 - Standard Specification for Welded Steel Plain Bar or Rod Mats for Concrete Reinforcement
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Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or
withdrawn.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: A 704/A 704M – 96
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Specification for
Welded Steel Plain Bar or Rod Mats for Concrete
1
Reinforcement
This standard is issued under the fixed designation A 704/A 704M; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 4. Materials
1.1 This specification covers material in mat (or sheet) form 4.1 Plain bars or rods of Grades 40 and 60 [300 and 420]
fabricated from hot rolled, plain steel bars or rods to be used used in the manufacture of mats shall conform to Specification
for the reinforcement of concrete. The mats shall consist of two A 615 [A 615M].
5
layers of bars or rods which are assembled by welding at right 4.2 Maximum size of bar and rod material shall be ⁄8 in. [16
angles to each other. mm] nominal diameter. Minimum size of rod material shall be
7
1.2 This specification is applicable for orders in either ⁄32in. [6 mm] nominal diameter.
inch-pound units (as A 704) or in SI units [as A 704M].
5. Fabrication
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 5.1 Fabricated mats shall be composed of two layers of
plain bars or rods substantially parallel and perpendicular to
shown in brackets. The values stated in each system are not
exact equivalents; therefore, each system must be used inde- each other.
5.2 Assembly—Mats shall be assembled by means of weld-
pendently of the other. Combining values from the two systems
may result in nonconformance with this specification. ing to provide attachment at all intersections.
5.2.1 Welded joints shall withstand normal shipping and
2. Referenced Documents
handling without becoming broken, but the presence of broken
2.1 ASTM Standards: welds, regardless of cause, shall not constitute cause for
A 185 Specification for Steel Welded Wire, Fabric, Plain, rejection unless the number of broken welds per sheet exceed
2
for Concrete Reinforcement 1 % of the total, provided that not more than one half of the
A 615/A 615M Specification for Deformed and Plain Billet- permissible maximum number of broken welds are located on
2
Steel Bars for Concrete Reinforcement any one bar or rod.
5.2.2 Welding shall be done in such a manner that the
3. Ordering Information
minimum tensile strength, yield strength, and elongation re-
3.1 The purchaser should specify: quirements for material as described in Section 4 shall be met
3.1.1 Quantity,
when a specimen is tested across a point of weld. Weld shear
3.1.2 Size and spacing of members in each direction, strength requirements shall be in compliance with Section 6.
3.1.3 Plain bar or rod,
6. Mechanical Requirements
3.1.4 Grade required (Grade 40 or 60 [300 or 420] as
appropriate), 6.1 Strength of Connections in Welded Plain Bar or Rod
3.1.5 Type of steel, as appropriate (see Section 4), and Mats—In order to assure adequate weld shear strength between
3.1.6 ASTM designation and year of issue. longitudinal and transverse member, weld shear strength tests,
as described in 6.3.2, shall be made. The minimum average
NOTE 1—A typical ordering description is as follows: 1000 welded bar
shear value in pounds-force [Newtons] shall be not less than
1
mats; Grade 40; to ASTM A 704 – ______. 6 by 12 in.; ⁄2in. diameter by
1
25 000 [172] multiplied by the nominal area of the larger
120 in. longitudinal tip to tip, outer bars spaced 54 in.; ⁄2 in. diameter by
60 in. transverse, outer bars spaced 108 in. [1000 welded bar mats; Grade member in square inches [square millimetres].
300; to ASTM A 704M – ______. 150 by 300 mm; 12 mm diameter by
6.2 Number of Tests:
3000 mm longitudinal tip-to-tip, outer bars spaced 1350 mm; 12 mm
6.2.1 One bar or rod of each size or grade to be used in the
diameter by 1500 mm transverse, outer bars spaced 2750 mm].
fabrication of the mat shall be tested for conformance with the
2 2
provisions of 4.1 or 4.2 2 for each 75 000 ft [7000 m ] of mats
1
This specification is under the jurisdiction of ASTM Committee A-1 on Steel, or fraction thereof.
Stainless Steel, and Related Alloys and is the direct responsibility of Subcommittee
6.2.2 One sample consisting of longitudinal members with
A01.05 on Steel Reinforcement.
not less than two connections on the same transverse member
Current edition approved May 10, 1996. Published July 1996. Originally
shall be taken and tested for conformance with the provisions
published as A 704 – 74. Last previous edition A 704/A 704M –
...

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This specification covers deformed and plain steel reinforcing bars. Steel samples shall be blast cleaned and shall be coated with a protective fusion-bonded epoxy coating by electrostatic spray or other suitable method. The steel specimens shall undergo deformation test, holiday checks, bending tests, and cathodic disbondment test. The steels materials shall conform to the required values of coating thickness, continuity, flexibility, adhesion.
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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.
Note 1: The coating applicator is identified throughout this specification as the manufacturer.  
1.2 Other organic coatings may be used provided they meet the requirements of this specification.  
1.3 Requirements for coatings are contained in Annex A1.  
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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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Standard Specification for Stress-Relieved Steel Wire for Prestressed Concrete

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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.

  • Technical specification
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    English language
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  • Technical specification
    4 pages
    English language
    sale 15% off