ASTM A881/A881M-16

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: 29-Feb-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

Relations

• Replaces: ASTM A881/A881M-15 - Standard Specification for Steel Wire, Indented, Low-Relaxation for Prestressed Concrete Railroad Ties
• Effective Date: 01-Mar-2016
• Referred By: ASTM A1096/A1096M-22 - Standard Test Method for Evaluating Bond of Individual Steel Wire, Indented or Plain, for Concrete Reinforcement
• Effective Date: 01-Mar-2016

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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 −16
Standard Specification for
Steel Wire, Indented, Low-Relaxation for Prestressed
1
Concrete
This standard is issued under the fixed designationA881/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 It shall be the responsibility of the purchaser to specify
SI units are shown in brackets. The values stated in each
all requirements that are necessary for material ordered to this
system may not be exact equivalents; therefore, each system
specification. Such requirements shall include, but are not
shall be used independently of the other. Combining values
limited to, the following:
from the two systems may result in non-conformance with the
4.1.1 Quantity (weight [mass]),
specification.
4.1.2 Name of material (indented, low-relaxation steel wire
2. Referenced Documents
for prestressed concrete),
2
4.1.3 Required minimum tensile strength (see Table 1),
2.1 ASTM Standards:
A370 Test Methods and Definitions for Mechanical Testing
4.1.4 Nominal diameter,
of Steel Products
4.1.5 Packaging,
A421/A421M Specification for Stress-Relieved Steel Wire
4.1.6 ASTM designation and year of issue, and
for Prestressed Concrete
4.1.7 Special requirements (such as, indentation sidewall
A700 Guide for Packaging, Marking, and Loading Methods
angle or outside inspection), if any.
for Steel Products for Shipment
3
2.2 U.S. Military Standard:
5. Materials and Manufacture
MIL-STD-129 Marking for Shipment and Storage
3 5.1 The steel shall be made by any commercially accepted
2.3 U.S. Federal Standard:
process.
Fed. Std. No. 123 Marking for Shipment (Civil Agencies)
5.2 The base metal shall be carbon steel of such quality that
3. Terminology
when drawn to wire, indented, and then thermo-mechanically
3.1 Definitions of Terms Specific to This Specification: treated, shall have the properties and characteristics prescribed
3.1.1 indented steel wire, n—indented, cold-drawn, low- in this specification.
relaxation wire, the wire surface having indentations that
reduce longitudinal movement of the wire while also providing 6. Mechanical Property Requirements
consistent prestress transfer length.
6.1 General—Indented wire shall be supplied in coils,
packs, or spools to the specified mechanical properties in Table
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel, 1. It shall be permissible to furnish diameters of wire not
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
specifically itemized in this specification, provided that the
A01.05 on Steel Reinforcement.
strength is defined and they conform otherwise to the require-
Current edition approved March 1, 2016. Published March 2016. Originally
ments of this specification.
approved in 1990. Last previous edition approved in 2015 as A881/A881M – 15.
DOI: 10.1520/A0881_A0881M-16.
6.2 Tensile Strength—The minimum tensile strength of the
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
indented wire shall conform to the requirements of Table 1.
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
Other values of tensile strength and nominal diameters can be
the ASTM website.
specified if shown by test that the strength exceeds that
3
Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,
specified. The tension test shall be made in accordance with
Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http://
dodssp.daps.dla.mil. Test Methods A370.
*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−16
TABLE 1 Tensile Strength Requirements
specimen, for a total of nine bends per test. Each bend shall be
Nominal Weight inspected after testing to ensure no cracking or fracturing
Nominal Tensile Nominal
[Mass], lb/1000 ft
A
occurred.
Diameter Strength Area
[g/m]
2 2
in. [mm] lbf [kN] in. [mm ]
6.6 Relaxation—Relaxation properties shall be provided at
0.198
...

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 − 15 A881/A881M − 16
Standard Specification for
Steel Wire, Indented, Low-Relaxation for Prestressed
1
Concrete Railroad Ties
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 uncoated, indented, low-relaxation steel wire for use as prestressing tendons in concrete railroad
ties.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 standard.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
E328 Test Methods for Stress Relaxation for Materials and Structures
3
2.2 U.S. Military Standards: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 Standard:Specification:
3.1.1 indented steel wire for railroad ties, wire, n—indented, cold-drawn, uncoated, low-relaxation wire intended for use as
prestressing tendons in concrete railroad ties, 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—indented cold-drawn wire, straightened, straightened wire that receives a suitable continuous
thermo-mechanical treatment as the last operation to produce the properties listed.
4. Ordering Information
4.1 It 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 not limited to, the following:
4.1.1 Quantity (weight [mass]),
4.1.2 Name of material (indented, low-relaxation steel wire for prestressed concrete railroad ties),concrete),
4.1.3 Required minimum tensile strength (see Table 1),
4.1.4 Nominal diameter,
4.1.5 Packaging,
4.1.6 ASTM designation and year of issue, and
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 Nov. 1, 2015March 1, 2016. Published December 2015March 2016. Originally approved in 1990. Last previous edition approved in 20102015
as A881/A881M – 10.A881/A881M – 15. DOI: 10.1520/A0881_A0881M-15.10.1520/A0881_A0881M-16.
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 − 16
TABLE 1 Tensile Strength Requirements
Nominal Weight
Nominal Tensile Nominal
[Mass], lb/1000 ft
A
Diameter Strength Area
[g/m]
2 2
in. [mm] lbf [kN] in. [mm ]
0.198 [5.03] 7230 [32.2] 0.0308 [19.86] 104.8 [155.9]
0.198 [5.03] 7700 [34.3] 0.0308 [19.86] 104.8 [155.9]
0.2094 [5.32] 9000 [39.1] 0.0344 [22.23] 117.1 [174.5]
A
The nominal cross-sectional area is based on the nominal diameter. The actual
2 2
average area in in. [mm ] may be calculated by dividing the mass (weight)weight
3
[mass] per linear in. [mm] of the specimen in lb [kg] by 0.2836 (weight of 1 in. of
–6 3 3
steel) [7.850 × 10 kg/mm (mass of 1 mm of steel)]. The amount of variation is
dependent on the shape and character of the indentations.
4
...