ASTM A421/A421M-02

Standard Specification for Uncoated Stress-Relieved Steel Wire for Prestressed Concrete

SCOPE
1.1 This specification covers two types of uncoated stress-relieved round high-carbon steel wire commonly used in prestressed linear 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 Supplement I describes low relaxation wire and relaxation testing for that product.
1.3 The values stated in either inch-pound or SI units are to be regarded as standard. Within the text, the inch-pound units are shown in parentheses. The values stated in each system are not exact equivalents; therefore, each system shall be used independently of the other, without combining values in any way.

General Information

• Status: Historical
• Publication Date: 09-Sep-2002
• ICS: 77.140.15 - Steels for reinforcement of concrete
• ICS: 77.140.65 - Steel wire, wire ropes and link chains
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.05 - Steel Reinforcement

Relations

• Replaces: ASTM A421/A421M-98a - Standard Specification for Uncoated Stress-Relieved Steel Wire for Prestressed Concrete
• Effective Date: 10-Sep-2002
• Replaced By: ASTM A421/A421M-05 - Standard Specification for Uncoated Stress-Relieved Steel Wire for Prestressed Concrete
• Effective Date: 01-Mar-2005
• Referred By: ASTM C1804-20 - Standard Specification for Spun Cast Prestressed Concrete Bases for Tapered Steel Lighting Poles
• Effective Date: 10-Sep-2002
• Referred By: ASTM C935-19 - Standard Specification for General Requirements for Prestressed Concrete Poles Statically Cast
• Effective Date: 10-Sep-2002
• Referred By: ASTM A1096/A1096M-22 - Standard Test Method for Evaluating Bond of Individual Steel Wire, Indented or Plain, for Concrete Reinforcement
• Effective Date: 10-Sep-2002
• Referred By: ASTM A881/A881M-23 - Standard Specification for Steel Wire, Indented, Low-Relaxation for Prestressed Concrete
• Effective Date: 10-Sep-2002
• Referred By: ASTM C1089-19 - Standard Specification for Spun Cast Prestressed Concrete Poles
• Effective Date: 10-Sep-2002
• Referred By: ASTM C913-21 - Standard Specification for Precast Concrete Water and Wastewater Structures
• Effective Date: 10-Sep-2002
• Referred By: ASTM C825-19 - Standard Specification for Precast Concrete Barriers
• Effective Date: 10-Sep-2002

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
American Association State
Designation: A 421/A 421M – 02 Highway and Transportation Officials Standard
AASHTO No.: M 204
Standard Specification for
Uncoated Stress-Relieved Steel Wire for Prestressed
1
Concrete
This standard is issued under the fixed designationA 421/A 421M; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope* 2.3 Federal Standard:
5
Fed. Std. No. 123 Marking for Shipments (CivilAgencies)
1.1 This specification covers two types of uncoated stress-
relieved round high-carbon steel wire commonly used in
3. Ordering Information
prestressed linear concrete construction, as follows:
3.1 Orders for stress-relieved wire under this specification
1.1.1 Type BA wire is used for applications in which cold-
should include the following information:
end deformation is used for anchoring purposes (Button
3.1.1 Quantity (kg [lb]),
Anchorage), and
3.1.2 Diameter,
1.1.2 Type WA wire is used for application in which the
3.1.3 Type of anchorage (BA or WA),
ends are anchored by wedges, and no cold-end deformation of
3.1.4 Packaging,
the wire is involved (Wedge Anchorage).
3.1.5 ASTM designation and date of issue, and
1.2 Supplement I describes low relaxation wire and relax-
3.1.6 Special requirements, if any.
ation testing for that product.
1.3 The values stated in either inch-pound or SI units are to
NOTE 1—A typical ordering description is as follows: 10 000 kg of
be regarded as standard. Within the text, the inch-pound units 6.35-mmdiameterwire,TypeBAinapproximately450kg1.5-mdiameter
coils to ASTM A 421/A 421M– _______(22 000 lb 0.250-in. diameter
are shown in parentheses. The values stated in each system are
wire, Type BA in approximately 1000 lb 60-in. diameter coils to ASTM
not exact equivalents; therefore, each system shall be used
A 421/A 421M–_______).
independently of the other, without combining values in any
way.
4. Manufacture
4.1 Process—The steel shall be made by the basic-oxygen,
2. Referenced Documents
open-hearth, or electric-furnace process.
2.1 ASTM Standards:
4.2 Internal Soundness—A sufficient discard shall be made
A 370 Test Methods and Definitions for MechanicalTesting
to ensure freedom from injurious piping and undue segrega-
2
of Steel Products
tion.
E 30 Test Methods for Chemical Analysis of Steel, Cast
4.3 Wire—The wire shall be cold-drawn to size and suitably
3
Iron, Open-Hearth Iron, and Wrought Iron
stress relieved after cold drawing by a continuous heat treat-
E 328 Methods for Stess Relaxation Tests for Materials and
ment to produce the prescribed mechanical properties.
4
Structures
2.2 Military Standards:
5. Physical Requirements
5
MIL-STD-129 Marking for Shipment and Storage
5.1 Tensile Strength—The tensile strength of Type BA wire
MIL-STD-163 Steel Mill Products, Preparation for Ship-
and Type WA wire shall conform to the requirements pre-
5
ment and Storage
scribed in Table 1, and shall be determined as prescribed in
Test Methods and Definitions A 370, including Annex A4.
1
5.2 Yield Strength:
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
Stainless Steel and RelatedAlloys, and is the direct responsibility of Subcommittee 5.2.1 The minimum yield strength for all wire, measured by
A01.05 on Steel Reinforcement.
the 1.0 % extension under load method, shall not be less than
Current edition approved Sept. 10, 2002. Published June 2003. Originally
85 % of the specified minimum breaking strength.
published as A 421 – 58 T. Last previous edition A 421 – 98a.
2
5.2.2 The extension under load shall be measured by an
Annual Book of ASTM Standards, Vol 01.03.
3
Discontinued. See 1995 Annual Book of ASTM Standards, Vol 03.05.
extensometer calibrated with the smallest division not larger
4
Annual Book of ASTM Standards, Vol 03.01.
than 0.0001 mm/mm (0.0001 in./in.) of gage length.
5
AvailablefromStandardizationDocumentsOrderDesk,Bldg.4SectionD,700
Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
*A Summary of Changes section appears at the end of this standard.
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A 421/A 421M – 02
TABLE 1 Tensile Strength Requirements
7.4 The wire shall be furnished in firmly tied coils having a
Tensile Strength, min, MPa (psi) minimum inside diameter of 1219 mm (48 in.). Each coil shall
Nominal Diameter, mm
(in.) be of one continuous length.
Type BA Type WA
A 7.5 There shall be no welds or joints in the fini
...