ASTM A910/A910M-10

Standard Specification for Uncoated, Weldless, 2- 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- 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 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. The two grades are 1725 (250) and 1860 (270). Grades 250 and 270 have minimum tensile strengths of 1725 MPa (250 ksi) and 1860 MPa (270 ksi) respectively, based on the nominal area of the strand.
1.2 The values stated in either inch-pound units or SI units are to be regarded as the 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 must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.

General Information

• Status: Historical
• Publication Date: 31-Mar-2010
• 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-05 - Standard Specification for Uncoated, Weldless, 2- and 3-Wire Steel Strand for Prestressed Concrete
• Effective Date: 01-Apr-2010
• Replaced By: ASTM A910/A910M-12 - Standard Specification for Uncoated, Weldless, 2-Wire and 3-Wire Steel Strand for Prestressed Concrete
• Effective Date: 15-Nov-2012

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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 −10
StandardSpecification for
Uncoated, Weldless, 2- 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 Thisspecificationcoverstwotypesandtwogradesof2- 3.1 Definitions of Terms Specific to This Standard:
and 3-wire, uncoated steel strand for use in pretensioned and 3.1.1 strand, n—all strands shall be comprised of either two
posttensionedprestressedconcreteconstruction.Thetwotypes wires or three wires helically wound around each other; they
of strand are low-relaxation and stress-relieved (normal- shallhaveauniformpitchofnotlessthan12normorethan16
relaxation). Low-relaxation shall be regarded as the standard times the nominal diameter of the strand.
type. Stress-relieved (normal-relaxation) strand will not be
3.1.2 Discussion—The direction of lay may be either right
furnished unless specifically ordered, or by arrangement be-
or left hand; however, strands of different lays shall not be
tween purchaser and supplier. The two grades are 1725 (250)
spliced together.
and 1860 (270). Grades 250 and 270 have minimum tensile
strengths of 1725 MPa (250 ksi) and 1860 MPa (270 ksi)
4. Ordering Information
respectively, based on the nominal area of the strand.
4.1 It shall be the responsibility of the purchaser to specify
1.2 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 as the standard. Within the text, the
specification. Such requirements shall include, but are not
inch-pound units are shown in parentheses. The values stated
limited to, the following:
in each system are not exact equivalents; therefore, each
4.1.1 Quantity (meters [feet]),
system must be used independently of the other. Combining
4.1.2 Diameter of strand (Section 7),
values from the two systems may result in nonconformance
4.1.3 Number of wires (2 or 3),
with the specification.
4.1.4 Grade of strand (see 1.1 and Table 1 and Table 2),
4.1.5 Type of strand (see 1.1 and Table 2),
2. Referenced Documents
4.1.6 Packaging (Section 14),
2
2.1 ASTM Standards:
4.1.7 ASTM designation and year of issue, and
A1061/A1061MTest Methods for Testing Multi-Wire Steel
4.1.8 Special requirements, if any.
Strand
NOTE 1—A typical ordering description is as follows: 100000 m
3
2.2 U.S. Military Standards:
(325000 ft) of 6.2 mm (0.244 in.) diameter, three wire, Grade 1860 MPa
MIL-STD-129Marking for Shipment and Storage
(270 ksi), low-relaxation strand in 10000 m (32500 ft) reelless packs
MIL-STD-163SteelMillProductsPreparationforShipment
conforming to ASTM A910/A910M–XX.
and Storage
3
5. Materials and Manufacture
2.3 Federal Standards:
Fed. Std. No. 123Marking for Shipments (Civil Agencies)
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
1
This specification is under the jurisdiction ofASTM Committee A01 on Steel,
characteristics prescribed in this specification.
Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee
A01.05 on Steel Reinforcement.
5.2 Wire—Thewirefromwhichthestrandistobefabricated
Current edition approved April 1, 2010. Published July 2010. Originally
shall be round and have a dry-drawn finish.
approved in 1992. Last previous edition approved in 2005 as A910/A910M–05.
DOI: 10.1520/A0910_A0910M-10.
NOTE 2—This product is a composite of two or three wires and is
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
produced to mechanical properties only, of which the chemical composi-
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
tion of all wires or any individual wire is not pertinent to this application,
Standards volume information, refer to the standard’s Document Summary page on
and heat identity is not necessarily maintained. It is possible that wire
the ASTM website.
3
frommorethanoneheatmaybeusedinthemanufactureofareelorpack.
AvailablefromU.S.GovernmentPrintingOfficeSuperintendentofDocuments,
732 N. Capitol St., NW, Mail Stop: SDE, Washington, DC 20401, http:// Traceability is based on pack identity as maintained and reported by the
www.access.gpo.gov. manufacturer.
*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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This document is not anASTM standard and is intended only to provide the user of anASTM 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–05 Designation: A910/A910M – 10
Standard Specification for
Uncoated, Weldless, 2- 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*
1.1 This specification covers two types and two grades of 2- and 3-wire, uncoated steel strand for use in pretensioned and
posttensionedprestressedconcreteconstruction.Thetwotypesofstrandarelow-relaxationandstress-relieved(normal-relaxation).
Low-relaxation shall 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. The two grades are 1725 (250) and 1860 (270). Grades
250 and 270 have minimum tensile strengths of 1725 MPa (250 ksi) and 1860 MPa (270 ksi) respectively, based on the nominal
area of the strand.
1.2 The values stated in either inch-pound units or SI units are to be regarded as the 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 must be used
independently of the other. Combining values from the two systems may result in nonconformance with the specification.
2. Referenced Documents
2
2.1 ASTM Standards:
A370Test Methods and Definitions for Mechanical Testing of Steel Products
E328TestMethodsforStressRelaxationforMaterialsandStructures1061/A1061M TestMethodsforTestingMulti-WireSteel
Strand
3
2.2 U.S. Military Standards:
MIL-STD-129 Marking for Shipment and Storage
MIL-STD-163 Steel Mill Products Preparation for Shipment and Storage
3
2.3 Federal Standard: Federal Standards:
Fed. Std. No. 123 Marking for Shipments (Civil Agencies)
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 strand, n—all strands shall be comprised of either two wires or three wires helically wound around each other; they shall
have a uniform pitch of not less than 12 nor more than 16 times the nominal diameter of the strand.
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.
4. Ordering Information
4.1It4.1 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]),
4.1.2 Diameter of strand (Section 7),
4.1.3 Number of wires (2 or 3),
4.1.4 Grade of strand (see 1.1 and Table 1 and Table 2),
1
This specification is under the jurisdiction ofASTM CommitteeA01 on Steel, Stainless Steel,Steel and RelatedAlloys and is the direct responsibility of Subcommittee
A01.05 on Steel Reinforcement.
Current edition approved MarchApril 1, 2005.2010. Published March 2005.July 2010. Originally approved in 1992. Last previous edition approved in 19992005 as
A910/A910M–99.A910/A910M–05. DOI: 10.1520/A0910_A0910M-105.
2
ForreferencedASTMstandards,visittheASTMwebsite,www.astm.org,[e-mail] 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, Bldg. 4 Section D, 700 Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
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.
*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 – 10
TABLE 1 Breaking Strength Requirements
Description and Diameter of Strand
Breaking Strength of Steel Area of Weight of
Strand Strand Strand
in. mm
Nominal Nominal
2 2
Description Description lbf kN in. mm lbs/1000 ft kg/1000 m
Diameter Diameter
GRADE 250 (1725 MPa)
2 3 0.114 0.228 2 3 2.90 5.8 5000 22.2 0.020 13.2 69.9 104.0
3 3 0.089 0.189 3 3 2.25 4.8 4750 21.1 0.019 12.0 63.3 94.2
3 3 0.095 0.205 3 3 2.40 5.2 5250 23.4 0.021 13.6 71.9 107.0
3 3 0.114 0.244 3 3 2.90 6.2 7750 34.5 0.031 19.8 104.0
...