ASTM A910/A910M-12

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: 14-Nov-2012
• 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-10 - Standard Specification for Uncoated, Weldless, 2- and 3-Wire Steel Strand for Prestressed Concrete
• Effective Date: 15-Nov-2012
• Replaced By: ASTM A910/A910M-16 - 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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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 −12
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.
1. Scope* 3. Terminology
1.1 This specification covers two types and two grades of 3.1 Definition of Term Specific to This Specification:
2-wire and 3-wire, uncoated steel strand for use in prestressed 3.1.1 strand, n—Either two or three wires helically wound
concrete construction. The two types of strand are low-
around each other with uniform pitch not less than 12 and not
relaxation and stress-relieved (normal-relaxation). Low- more than 16 times the nominal diameter of the strand.
relaxation is to be regarded as the standard type. Stress-
3.1.1.1 Discussion—The direction of lay may be either
relieved(normal-relaxation)strandwillnotbefurnishedunless
right-orleft-hand;however,strandsofdifferentlaysshouldnot
specifically ordered. The two grades are 250 [1725] and 270
be spliced together.
[1860]. Grades 250 [1725] and 270 [1860] have minimum
tensile strengths of 250 ksi [1725 MPa] and 270 ksi [1860
4. Ordering Information
MPa] respectively, based on the nominal area of the strand.
4.1 It shall be the responsibility of the purchaser to specify
1.2 This specification is applicable for orders in either
all requirements that are necessary for material ordered to this
inch-pound units (as Specification A910) or in SI units (as
specification. Such requirements shall include, but are not
Specification A910M).
limited to, the following:
4.1.1 Quantity (feet [metres]),
1.3 The values stated in either inch-pound units or SI units
4.1.2 Nominal diameter and description of strand (Table 1),
are to be regarded separately as standard. Within the text, the
4.1.3 Number of wires (2 or 3),
SI units are shown in brackets. The values stated in each
system are not exact equivalents; therefore, each system shall 4.1.4 Grade,
beusedindependentlyoftheother.Combiningvaluesfromthe 4.1.5 Type of strand (low-relaxation or stress-relieved (nor-
two systems may result in non-conformance with the specifi-
mal relaxation)),
cation.
4.1.6 Inspection (11.1),
4.1.7 Load-elongation curve (13.2),
2. Referenced Documents
4.1.8 Packaging (14.1), and
2
2.1 ASTM Standard:
4.1.9 ASTM designation and year of issue.
A1061/A1061MTest Methods for Testing Multi-Wire Steel
Strand
5. Materials and Manufacture
3
2.2 U.S. Military Standard:
5.1 Base Metal—The base metal shall be carbon steel of
MIL-STD-129Marking for Shipment and Storage
3 such quality that when drawn to wire, fabricated into strand
2.3 Federal Standard:
and then thermally treated, it shall have the properties and
Fed. Std. No. 123Marking for Shipments (Civil Agencies)
characteristics prescribed in this specification.
5.2 Wire—Thewirefromwhichthestrandistobefabricated
1
This specification is under the jurisdiction ofASTM Committee A01 on Steel,
shall be round and have a dry-drawn finish.
Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee
A01.05 on Steel Reinforcement.
NOTE 1—This product is a composite of two or three wires and is
Current edition approved Nov. 15, 2012. Published December 2012. Originally
produced only to meet the prescribed mechanical properties, of which the
approved in 1992. Last previous edition approved in 2010 as A910/A910M–10.
chemical composition of all wires or any individual wire is not pertinent
DOI: 10.1520/A0910_A0910M-12.
2
to this application, and heat identity is not necessarily maintained. It is
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM possible that wire from more than one heat may be used in the
Standards volume information, refer to the standard’s Document Summary page on manufactureofareelorreellesspack.Traceabilityisbasedontheidentity
the ASTM website.
of reels or reelless packs as maintained and reported by the manufacturer.
3
AvailablefromU.S.GovernmentPrintingOfficeSuperintendentofDocuments,
5.3 Treatment—After stranding, low-relaxation strand shall
732 N. Capitol St., NW, Mail Stop: SDE, Washington, DC 20401, http://
www.access.gpo.gov. be subjected to a continuous thermo-mechanical treatment to
*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−12
TABLE 1 Breaking Strength Requireme
...

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 − 10 A910/A910M − 12
Standard Specification for
Uncoated, Weldless, 2-2-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 2-2-wire and 3-wire, uncoated steel strand for use in pretensioned and
posttensioned prestressed concrete construction. The two types of strand are low-relaxation and stress-relieved (normal-relaxation).
Low-relaxation shall is to be regarded as the standard type. Stress-relieved (normal-relaxation) strand will not be furnished unless
specifically ordered, or by arrangement between purchaser and supplier. ordered. The two grades are 1725 (250) and 1860
(270).250 [1725] and 270 [1860]. Grades 250 [1725] and 270 [1860] have minimum tensile strengths of 1725 MPa (250 ksi) and
1860 MPa (270 ksi)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 the standard. Within the text, the
inch-poundSI units are shown in parentheses.brackets. The values stated in each system are not exact equivalents; therefore, each
system mustshall be used independently of the other. Combining values from the two systems may result in nonconformancenon-
conformance with the specification.
2. Referenced Documents
2
2.1 ASTM Standards:Standard:
A1061/A1061M Test Methods for Testing Multi-Wire Steel Strand
3
2.2 U.S. Military Standards:Standard:
MIL-STD-129 Marking for Shipment and Storage
MIL-STD-163 Steel Mill Products Preparation for Shipment and Storage
3
2.3 Federal Standards:Standard:
Fed. Std. No. 123 Marking for Shipments (Civil Agencies)
3. Terminology
3.1 DefinitionsDefinition of TermsTerm Specific to This Standard:Specification:
3.1.1 strand, n—all strands shall be comprised of either two wires Either two or three wires helically wound around each other;
they shall have a other with uniform pitch of not less than 12 nor 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 April 1, 2010Nov. 15, 2012. Published July 2010December 2012. Originally approved in 1992. Last previous edition approved in 20052010 as
A910/A910M – 05.A910/A910M – 10. DOI: 10.1520/A0910_A0910M-10.10.1520/A0910_A0910M-12.
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 either right- or left-hand; however, strands of different lays should not be spliced together.
3.1.2 Discussion—The direction of lay may be either right or left hand; however, strands of different lays shall not be spliced
together.
*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 − 12
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 (meters [feet]),(feet [metres]),
4.1.2 Diameter Nominal diameter and description of strand (Section (Table 17),
4.1.3 Number of wires (2 or 3),
4.1.4 Grade of strand (see Grade,1.1 and Table 1 and Table 2),
4.1.5 Type of strand (see(low-relaxation 1.1 andor stress-relieved Table 2),(normal relaxation)),
4.1.6 Inspection (11.1),
4.1.7 Load-elongation curve (13.2),
...