ASTM A910/A910M-05

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: 28-Feb-2005
• 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-99 - Standard Specification for Uncoated, Weldless, 2- and 3-Wire Steel Strand for Prestressed Concrete
• Effective Date: 01-Mar-2005
• Replaced By: ASTM A910/A910M-10 - Standard Specification for Uncoated, Weldless, 2- and 3-Wire Steel Strand for Prestressed Concrete
• Effective Date: 01-Apr-2010

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: A910/A910M – 05
Standard Specification for
Uncoated, Weldless, 2- and 3-Wire Steel Strand for
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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* MIL-STD-163 Steel Mill Products Preparation for Ship-
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ment and Storage
1.1 Thisspecificationcoverstwotypesandtwogradesof2-
2.3 Federal Standard:
and 3-wire, uncoated steel strand for use in pretensioned and
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Fed. Std. No. 123 Marking for Shipments (CivilAgencies)
posttensionedprestressedconcreteconstruction.Thetwotypes
of strand are low-relaxation and stress-relieved (normal-
3. Terminology
relaxation). Low-relaxation shall be regarded as the standard
3.1 Definitions of Terms Specific to This Standard:
type. Stress-relieved (normal-relaxation) strand will not be
3.1.1 strand, n—allstrandsshallbecomprisedofeithertwo
furnished unless specifically ordered, or by arrangement be-
wires or three wires helically wound around each other; they
tween purchaser and supplier. The two grades are 1725 (250)
shallhaveauniformpitchofnotlessthan12normorethan16
and 1860 (270). Grades 250 and 270 have minimum tensile
times the nominal diameter of the strand.
strengths of 1725 MPa (250 ksi) and 1860 MPa (270 ksi)
3.1.2 Discussion—The direction of lay may be either right
respectively, based on the nominal area of the strand.
or left hand; however, strands of different lays shall not be
1.2 The values stated in either inch-pound units or SI units
spliced together.
are to be regarded as the standard. Within the text, the
inch-pound units are shown in parentheses. The values stated
4. Ordering Information
in each system are not exact equivalents; therefore, each
4.1 It shall be the responsibility of the purchaser to specify
system must be used independently of the other. Combining
all requirements that are necessary for material ordered to this
values from the two systems may result in nonconformance
specification. Such requirements shall include, but are not
with the specification.
limited to, the following:
4.1.1 Quantity (meters [feet]),
2. Referenced Documents
2 4.1.2 Diameter of strand (Section 7),
2.1 ASTM Standards:
4.1.3 Number of wires (2 or 3),
A370 Test Methods and Definitions for Mechanical Testing
4.1.4 Grade of strand (see 1.1 and Table 1 and Table 2),
of Steel Products
4.1.5 Type of strand (see 1.1 and Table 2),
E328 Test Methods for Stress Relaxation for Materials and
4.1.6 Packaging (Section 14),
Structures
4.1.7 ASTM designation and year of issue, and
2.2 U.S. Military Standards:
3 4.1.8 Special requirements, if any.
MIL-STD-129 Marking for Shipment and Storage
NOTE 1—A typical ordering description is as follows: 100000 m
(325000 ft) of 6.2 mm (0.244 in.) diameter, three wire, Grade 1860 MPa
1
(270 ksi), low-relaxation strand in 10000 m (32500 ft) reelless packs
This specification is under the jurisdiction ofASTM CommitteeA01 on Steel,
conforming to ASTM A910/A910M–XX.
Stainless Steel, and RelatedAlloys and is the direct responsibility of Subcommittee
A01.05 on Steel Reinforcement.
Current edition approved March 1, 2005. Published March 2005. Originally 5. Materials and Manufacture
approved in 1992. Last previous edition approved in 1999 as A910/A910M– 99.
5.1 Base Metal—The base metal shall be carbon steel of
DOI: 10.1520/A0910_A0910M-05.
2
such quality that when drawn to wire, fabricated into strand
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
and then thermally treated, it shall have the properties and
Standards volume information, refer to the standard’s Document Summary page on
characteristics prescribed in this specification.
the ASTM website.
3
5.2 Wire—The wire from which the strand is to be fabri-
AvailablefromStandardizationDocumentsOrderDesk,Bldg.4SectionD,700
Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS. cated shall be round and have a dry-drawn finish.
*A Summary of Changes section appears at the end of this standard.
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A910/A910M – 05
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
...