ASTM A910/A910M-16

Standard Specification for Uncoated, Weldless, 2-Wire and 3-Wire Steel Strand for Prestressed Concrete

ABSTRACT
This specification covers two types and two grades of 2- and 3-wire, uncoated weldless steel and strand for use in pretensioned and posttensioned prestressed concrete construction. One specimen for test shall be taken from each production lot of finished strand and tested for breaking strength, yield strength and elongation. Strands of Grades 250 and 270 shall conform to specified breaking strength and yield strength requirements. Low relaxation strand shall also be tested as prescribed.
SCOPE
1.1 This specification covers two types and two grades of 2-wire and 3-wire, uncoated steel strand for use in prestressed concrete construction. The two types of strand are low-relaxation and stress-relieved (normal-relaxation). Low-relaxation is to be regarded as the standard type. Stress-relieved (normal-relaxation) strand will not be furnished unless specifically ordered. The two grades are 250 [1725] and 270 [1860]. Grades 250 [1725] and 270 [1860] have minimum tensile strengths of 250 ksi [1725 MPa] and 270 ksi [1860 MPa] respectively, based on the nominal area of the strand.  
1.2 This specification is applicable for orders in either inch-pound units (as Specification A910) or in SI units (as Specification A910M).  
1.3 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 are not 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

Relations

• Replaces: ASTM A910/A910M-12 - Standard Specification for Uncoated, Weldless, 2-Wire and 3-Wire Steel Strand for Prestressed Concrete
• Effective Date: 01-Dec-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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:A910/A910M −16
Standard Specification for
Uncoated, Weldless, 2-Wire and 3-Wire Steel Strand for
1
Prestressed Concrete
This standard is issued under the fixed designationA910/A910M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.
A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
3
1. Scope* 2.2 U.S. Military Standard:
MIL-STD-129Marking for Shipment and Storage
1.1 This specification covers two types and two grades of
3
2.3 Federal Standard:
2-wire and 3-wire, uncoated steel strand for use in prestressed
Fed. Std. No. 123Marking for Shipments (Civil Agencies)
concrete construction. The two types of strand are low-
relaxation and stress-relieved (normal-relaxation). Low-
3. Terminology
relaxation is to be regarded as the standard type. Stress-
3.1 Definition of Term Specific to This Specification:
relieved(normal-relaxation)strandwillnotbefurnishedunless
3.1.1 strand, n—Either two or three wires helically wound
specifically ordered. The two grades are 250 [1725] and 270
around each other with uniform pitch not less than 12 and not
[1860]. Grades 250 [1725] and 270 [1860] have minimum
more than 16 times the nominal diameter of the strand.
tensile strengths of 250 ksi [1725 MPa] and 270 ksi [1860
3.1.1.1 Discussion—The direction of lay is either right-
MPa] respectively, based on the nominal area of the strand.
handed or left-handed.
1.2 This specification is applicable for orders in either
inch-pound units (as Specification A910) or in SI units (as
4. Ordering Information
Specification A910M).
4.1 It shall be the responsibility of the purchaser to specify
1.3 The values stated in either inch-pound units or SI units
all requirements that are necessary for material ordered to this
are to be regarded separately as standard. Within the text, the
specification. Such requirements shall include, but are not
SI units are shown in brackets. The values stated in each
limited to, the following:
system are not exact equivalents; therefore, each system shall
4.1.1 Quantity (feet [metres]),
beusedindependentlyoftheother.Combiningvaluesfromthe
4.1.2 Nominal diameter and description of strand (Table 1),
two systems may result in non-conformance with the specifi-
4.1.3 Number of wires (2 or 3),
cation.
4.1.4 Grade,
4.1.5 Type of strand (low-relaxation or stress-relieved (nor-
1.4 This international standard was developed in accor-
mal relaxation)),
dance with internationally recognized principles on standard-
4.1.6 Inspection (11.1),
ization established in the Decision on Principles for the
4.1.7 Load-elongation curve (13.2),
Development of International Standards, Guides and Recom-
4.1.8 Packaging (14.1), and
mendations issued by the World Trade Organization Technical
4.1.9 ASTM designation and year of issue.
Barriers to Trade (TBT) Committee.
5. Materials and Manufacture
2. Referenced Documents
2
5.1 Base Metal—The base metal shall be carbon steel of
2.1 ASTM Standard:
such quality that when drawn to wire, fabricated into strand
A1061/A1061MTest Methods for Testing Multi-Wire Steel
and then thermally treated, it shall have the properties and
Prestressing Strand
characteristics prescribed in this specification.
5.2 Wire—Thewirefromwhichthestrandistobefabricated
1
This specification is under the jurisdiction ofASTM Committee A01 on Steel,
Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee shall be round and have a dry-drawn finish.
A01.05 on Steel Reinforcement.
NOTE 1—This product is a composite of two or three wires and is
Current edition approved Dec. 1, 2016. Published January 2017. Originally
produced only to meet the prescribed mechanical properties, of which the
approved in 1992. Last previous edition approved in 2012 as A910/A910M–12.
DOI: 10.1520/A0910_A0910M-16.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
3
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Available from U.S. Government Printing Office, Superintendent of
Standards volume information, refer to the standard’s Document Summary page on Documents, 732 N. Capitol St., NW, Washington, DC 20401-0001, http://
the ASTM website. www.access.gpo.gov.
*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

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A910/A910M−16
TABLE 1 Breaking Strength Requirements
Description and Nominal Diameter of Strand
Breaking Strength of Steel Area of Weight [Mass] of
Strand Strand Strand
in. [mm]
Nominal Nominal
2 2
Description Description lbf [kN] in. [
...

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: A910/A910M − 12 A910/A910M − 16
Standard Specification for
Uncoated, Weldless, 2-Wire and 3-Wire Steel Strand for
1
Prestressed Concrete
This standard is issued under the fixed designation A910/A910M; 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 two types and two grades of 2-wire and 3-wire, uncoated steel strand for use in prestressed
concrete construction. The two types of strand are low-relaxation and stress-relieved (normal-relaxation). Low-relaxation is to be
regarded as the standard type. Stress-relieved (normal-relaxation) strand will not be furnished unless specifically ordered. The two
grades are 250 [1725] and 270 [1860]. Grades 250 [1725] and 270 [1860] have minimum tensile strengths of 250 ksi [1725 MPa]
and 270 ksi [1860 MPa] respectively, based on the nominal area of the strand.
1.2 This specification is applicable for orders in either inch-pound units (as Specification A910) or in SI units (as Specification
A910M).
1.3 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 are not 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 Standard:
A1061/A1061M Test Methods for Testing Multi-Wire Steel Prestressing Strand
3
2.2 U.S. Military Standard:
MIL-STD-129 Marking for Shipment and Storage
3
2.3 Federal Standard:
Fed. Std. No. 123 Marking for Shipments (Civil Agencies)
3. Terminology
3.1 Definition of Term Specific to This Specification:
3.1.1 strand, n—Either two or three wires helically wound around each other with uniform pitch not less than 12 and not more
than 16 times the nominal diameter of the strand.
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. 15, 2012Dec. 1, 2016. Published December 2012January 2017. Originally approved in 1992. Last previous edition approved in 20102012
as A910/A910M – 10.A910/A910M – 12. DOI: 10.1520/A0910_A0910M-12.10.1520/A0910_A0910M-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 U.S. Government Printing Office Superintendent of Documents, 732 N. Capitol St., NW, Mail Stop: SDE, Washington, DC 20401, http://
www.access.gpo.gov.
3.1.1.1 Discussion—
The direction of lay may be is either right- or left-hand; however, strands of different lays should not be spliced
together.right-handed or left-handed.
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 (feet [metres]),
*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

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A910/A910M − 16
4.1.2 Nominal diameter and description of strand (Table 1),
4.1.3 Number of wires (2 or 3),
4.1.4 Grade,
4.1.5 Type of strand (low-relaxation or stress-relieved (normal relaxation)),
4.1.6 Inspection (11.1),
4.1.7 Load-elongation curve (13.2),
4.1.8 Packaging (14.1), and
4.1.9 ASTM designation and year of issue.
5. Materials and Manufacture
5.1 Base Metal—The base metal shall be carbon steel of such quality that when drawn to wire, fabricated into strand and then
thermally treated, it shall have the properties and characteristics prescribed in this specification.
5.2 Wire—The wire from which the strand is to be fabricated shall be round and have a dry-drawn finish.
NOTE 1—This product is a composite of two or three wires and is produced only to meet the prescribed mechanical properties, of which the chemical
composition of all wires or any individua
...