ASTM A881/A881M-16a

Standard Specification for Steel Wire, Indented, Low-Relaxation for Prestressed Concrete

ABSTRACT
This specification covers uncoated, deformed, stress-relieved, and low-relaxation wire for use as prestressed tendons in concrete railroad ties. Deformed wires with nominal diameters shall be supplied in coils and shall conform to specified values of breaking strength requirements. The relaxation losses of normal stress-relieved and low-relaxation stress-relieved wires should not exceed the specified limits. The two acceptable types of deformed wire shall have specific dimensions of deformations, where the depth of indent shall be the average depth of six or more random indents measured at maximum depth. The material shall be tested on and shall conform to specified values of the following mechanical properties: breaking strength, load at 1% extension, elongation, bending, and relaxation.
SCOPE
1.1 This specification covers indented, low-relaxation steel wire for use in prestressed concrete.  
1.2 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 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.

General Information

• Status: Historical
• Publication Date: 30-Nov-2016
• ICS: 77.140.15 - Steels for reinforcement of concrete
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.05 - Steel Reinforcement

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: A881/A881M − 16a
Standard Specification for
Steel Wire, Indented, Low-Relaxation for Prestressed
1
Concrete
This standard is issued under the fixed designation A881/A881M; 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.
1. Scope* 3.1.2 low-relaxation wire, n—straightened wire that re-
ceives a suitable continuous thermo-mechanical treatment as
1.1 This specification covers indented, low-relaxation steel
the last operation to produce the properties listed.
wire for use in prestressed concrete.
1.2 The values stated in either inch-pound units or SI units
4. Ordering Information
are to be regarded separately as standard. Within the text, the
4.1 Orders for indented low-relaxation steel wire for pre-
SI units are shown in brackets. The values stated in each
stressed concrete shall include the following necessary infor-
system may not be exact equivalents; therefore, each system
mation:
shall be used independently of the other. Combining values
4.1.1 Quantity (weight [mass]),
from the two systems may result in non-conformance with the
4.1.2 Required minimum tensile strength (6.2),
specification.
4.1.3 Nominal diameter (6.1),
4.1.4 Packaging, and
2. Referenced Documents
4.1.5 ASTM designation and year of issue.
2
2.1 ASTM Standards:
4.2 The purchaser shall have the option to specify additional
A370 Test Methods and Definitions for Mechanical Testing
requirements, including but not limited to, the following:
of Steel Products
4.2.1 Indentation geometry (7.2, 7.3),
A421/A421M Specification for Stress-Relieved Steel Wire
4.2.2 Indentation sidewall angle (7.3, 7.4),
for Prestressed Concrete
4.2.3 Welding of rod prior to cold drawing permissible
A700 Guide for Packaging, Marking, and Loading Methods
(9.3),
for Steel Products for Shipment
3
4.2.4 Outside inspection (11.1),
2.2 U.S. Military Standard:
4.2.5 Special packaging (14.1, 14.2), and
MIL-STD-129 Marking for Shipment and Storage
3
4.2.6 Other special requirements, if any.
2.3 U.S. Federal Standard:
Fed. Std. No. 123 Marking for Shipment (Civil Agencies)
5. Materials and Manufacture
3. Terminology
5.1 The steel shall be made by any commercially accepted
steelmaking process.
3.1 Definitions of Terms Specific to This Specification:
3.1.1 indented steel wire, n—indented, cold-drawn, low-
5.2 The base metal shall be carbon steel of such quality that
relaxation wire, the wire surface having indentations that
when drawn to wire, indented, and then thermo-mechanically
reduce longitudinal movement of the wire while also providing
treated, shall have the properties and characteristics prescribed
consistent prestress transfer length.
in this specification.
6. Mechanical Property Requirements
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
6.1 General—Indented wire shall be supplied in coils,
A01.05 on Steel Reinforcement.
packs, or spools to the specified mechanical properties in Table
Current edition approved Dec. 1, 2016. Published January 2017. Originally
1. It shall be permissible to furnish diameters of wire not
approved in 1990. Last previous edition approved in 2016 as A881/A881M – 16.
DOI: 10.1520/A0881_A0881M-16A.
specifically itemized in this specification, provided that the
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
strength is defined and they conform otherwise to the require-
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
ments of this specification.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
6.2 Tensile Strength—The minimum tensile strength of the
3
Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,
indented wire shall conform to the requirements of Table 1.
Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http://
dodssp.daps.dla.mil. Other values of tensile strength and nominal diameters can be
*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
1

---------------------- Page: 1 ----------------------
A881/A881M − 16a
TABLE 1 Tensile Strength Requirements
uniform rate, with the duration of test to be between 10 and 30
Nominal Weight seconds. The bend location along the axis of the wire specimen
Nominal Tensile Nominal
[Mass], lb/1000 ft
A
shall be random and three locations shall be tested along the
Diameter Strength Area
[g/m]
2 2 specimen, for a total
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: A881/A881M − 16 A881/A881M − 16a
Standard Specification for
Steel Wire, Indented, Low-Relaxation for Prestressed
1
Concrete
This standard is issued under the fixed designation A881/A881M; 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.
1. Scope*
1.1 This specification covers indented, low-relaxation steel wire for use in prestressed concrete.
1.2 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 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.
2. Referenced Documents
2
2.1 ASTM Standards:
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
A421/A421M Specification for Stress-Relieved Steel Wire for Prestressed Concrete
A700 Guide for Packaging, Marking, and Loading Methods for Steel Products for Shipment
3
2.2 U.S. Military Standard:
MIL-STD-129 Marking for Shipment and Storage
3
2.3 U.S. Federal Standard:
Fed. Std. No. 123 Marking for Shipment (Civil Agencies)
3. Terminology
3.1 Definitions of Terms Specific to This Specification:
3.1.1 indented steel wire, n—indented, cold-drawn, low-relaxation wire, the wire surface having indentations that reduce
longitudinal movement of the wire while also providing consistent prestress transfer length.
3.1.2 low-relaxation wire, n—straightened wire that receives a suitable continuous thermo-mechanical treatment as the last
operation to produce the properties listed.
4. Ordering Information
4.1 Orders for indented low-relaxation steel wire for prestressed concrete shall include the following necessary information:
4.1.1 Quantity (weight [mass]),
4.1.2 Required minimum tensile strength (6.2),
4.1.3 Nominal diameter (6.1),
4.1.4 Packaging, and
4.1.5 ASTM designation and year of issue.
4.2 It The purchaser shall be the responsibility of the purchaser to specify all requirements that are necessary for material
ordered to this specification. Such requirements shall include, but are have the option to specify additional requirements, including
but not limited to, the following:
4.2.1 Quantity (weight [mass]),Indentation geometry (7.2, 7.3),
4.2.2 Name of material (indented,Indentation sidewall angle (7.3, 7.4low-relaxation steel wire for prestressed concrete),),
1
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 March 1, 2016Dec. 1, 2016. Published March 2016January 2017. Originally approved in 1990. Last previous edition approved in 20152016 as
A881/A881M – 15.A881/A881M – 16. DOI: 10.1520/A0881_A0881M-16. 10.1520/A0881_A0881M-16A.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from Standardization Documents Order Desk, DODSSP, Bldg. 4, Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http://dodssp.daps.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
1

---------------------- Page: 1 ----------------------
A881/A881M − 16a
4.2.3 Required minimum tensile strength (seeWelding of rod prior to Table 1cold drawing permissible (9.3),
4.2.4 Nominal diameter,Outside inspection (11.1),
4.1.5 Packaging,
4.2.5 ASTM designation andSpecial packaging (14.1, 14.2year of issue, ), and
4.2.6 Special requirements (such as, indentation sidewall angle or outside inspection), Other special requirements, if any.
5. Materials and Manufacture
5.1 The steel shall be made by any commercially accepted steelmaking process.
5.2 The base metal shall be carbon steel of such quality that when drawn to wire, indented, and then thermo-mechanically
treated, shall have the properties and characteristics prescribed in this specification.
6. Mechanical Property Requirements
6.1 General—Indented wire shall be sup
...