ASTM A416/A416M-12a
(Specification)Standard Specification for Steel Strand, Uncoated Seven-Wire for Prestressed Concrete
Standard Specification for Steel Strand, Uncoated Seven-Wire for Prestressed Concrete
ABSTRACT
This specification deals with the standard types and grade requirements of seven-wire, uncoated steel strands for use in the construction of pre-tensioned and post-tensioned pre-stressed concrete. The two types of strand are low-relaxation and stress-relieved (normal relaxation). The base metal shall be made of carbon steel and shall undergo stranding and continuous thermal and mechanical treatment. Mechanical testing methods shall be performed to determine the breaking strength, yield strength, elongation, and stress relaxation properties wherein the strand shall conform to the required mechanical attributes of the product. Final products shall be furnished on reels or in reelless packs for packaging and marked with two strong tags for identification. The requirements specified herein shall also be applicable for pre-stressed ground anchor construction.
SCOPE
1.1 This specification covers two types and two grades of seven-wire, uncoated steel strand for use prestressed concrete construction. The two types of strand are low-relaxation and stress-relieved (normal-relaxation). Low-relaxation strand is to be regarded as the standard type. Stress-relieved (normal-relaxation) strand will not be furnished unless specifically ordered. Grade 250 [1725] and Grade 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 A supplementary requirement (S1) is provided for use where bond strength testing of 0.600-in. [15.24-mm] diameter Grade 270 [1860] strand for applications in prestressed ground anchors is required by the purchaser. The supplementary requirement applies only when specified in the purchase order.
1.3 This specification is applicable for orders in either inch-pound units (as Specification A416) or in SI units (as Specification A416M).
1.4 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.
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Designation:A416/A416M −12a
StandardSpecification for
Steel Strand, Uncoated Seven-Wire for Prestressed
1
Concrete
This standard is issued under the fixed designationA416/A416M; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope* Grade 270 [1860], Uncoated, Used in Prestressed Ground
Anchors
1.1 This specification covers two types and two grades of
A1061/A1061MTest Methods for Testing Multi-Wire Steel
seven-wire, uncoated steel strand for use prestressed concrete
Strand
construction. The two types of strand are low-relaxation and
3
2.2 U.S. Military Standards:
stress-relieved(normal-relaxation).Low-relaxationstrandisto
MIL-STD-129 Marking for Shipment and Storage
be regarded as the standard type. Stress-relieved (normal-
3
2.3 U.S. Federal Standard:
relaxation) strand will not be furnished unless specifically
Fed.Std.No.123 Marking for Shipments (Civil Agencies)
ordered. Grade 250 [1725] and Grade 270 [1860] have mini-
mumtensilestrengthsof250ksi[1725MPa]and270ksi[1860
3. Terminology
MPa], respectively, based on the nominal area of the strand.
3.1 Definitions of Terms Specific to This Standard:
1.2 A supplementary requirement (S1) is provided for use
3.1.1 strand, n—a group of wires having a center wire
where bond strength testing of 0.600-in. [15.24-mm] diameter
enclosed tightly by six helically placed outer wires with
Grade 270 [1860] strand for applications in prestressed ground
uniform pitch of not less than 12 and not more than 16 times
anchors is required by the purchaser. The supplementary
the nominal diameter of the strand.
requirement applies only when specified in the purchase order.
3.1.1.1 Discussion—The direction of lay may be either
right-orleft-hand,however,strandsofdifferentlaysshouldnot
1.3 This specification is applicable for orders in either
be spliced together.
inch-pound units (as Specification A416) or in SI units (as
Specification A416M).
4. Ordering Information
1.4 The values stated in either inch-pound units or SI units
4.1 It shall be the responsibility of the purchaser to specify
are to be regarded separately as standard. Within the text, the
all requirements that are necessary for material ordered under
SI units are shown in brackets. The values stated in each
this specification. Such requirements to be considered include,
system may not be exact equivalents; therefore, each system
but are not limited to, the following:
shall be used independently of the other. Combining values
4.1.1 Quantity (feet [metres]),
from the two systems may result in non-conformance with the
4.1.2 Nominal diameter of strand,
specification.
4.1.3 Grade of strand,
4.1.4 Type of strand,
2. Referenced Documents
4.1.5 Weldless, if desired (8.1)
2
2.1 ASTM Standards:
4.1.6 Outside inspection, if required (11.1),
A981/A981MTestMethodforEvaluatingBondStrengthfor
4.1.7 Load-elongation curve, if desired (13.2),
0.600-in. [15.24-mm] Diameter Steel Prestressing Strand,
4.1.8 Packaging (14.1),
4.1.9 Supplementary Requirement S1, if desired, and
4.1.10 ASTM designation and year of issue.
1
This specification is under the jurisdiction ofASTM Committee A01 on Steel,
Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee
5. Materials and Manufacture
A01.05 on Steel Reinforcement.
Current edition approved Sept. 1, 2012. Published October 2012. Originally 5.1 Base Metal—The base metal shall be carbon steel of
approved in 1957. Last previous edition approved in 2012 as A416/A416M–12.
such quality that when drawn to wire, fabricated into strand,
DOI: 10.1520/A0416_A0416M-12A.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
3
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,
Standards volume information, refer to the standard’s Document Summary page on Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http://
the ASTM website. 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 ----------------------
A416/A416M−12a
and then thermally treated, shall have the properties and strand after yield determination. The percent is calculated on
characteristics prescribed in this specification. the new base length of jaw-to-jaw distance.
5.2 Wire—Thewirefromwhichthestrandistobefabricated 6.5 Relaxation Properties—Low-
...
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: A416/A416M − 12 A416/A416M − 12a
Standard Specification for
Steel Strand, Uncoated Seven-Wire for Prestressed
1
Concrete
This standard is issued under the fixed designation A416/A416M; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope*
1.1 This specification covers two types and two grades of seven-wire, uncoated steel strand for use prestressed concrete
construction. The two types of strand are low-relaxation and stress-relieved (normal-relaxation). Low-relaxation strand is to be
regarded as the standard type. Stress-relieved (normal-relaxation) strand will not be furnished unless specifically ordered. Grade
250 [1725] and Grade 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 A supplementary requirement (S1) is provided for use where bond strength testing of 0.600-in. [15.24-mm] diameter Grade
270 [1860] strand for applications in prestressed ground anchors is required by the purchaser. The supplementary requirement
applies only when specified in the purchase order.
1.3 This specification is applicable for orders in either inch-pound units (as Specification A416A416)) or in SI units (as
specificationSpecification A416MA416M).).
1.4 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.
2. Referenced Documents
2
2.1 ASTM Standards:
A981/A981M Test Method for Evaluating Bond Strength for 0.600-in. [15.24-mm] Diameter Steel Prestressing Strand, Grade
270 [1860], Uncoated, Used in Prestressed Ground Anchors
A1061/A1061M Test Methods for Testing Multi-Wire Steel Strand
3
2.2 U.S. Military Standards:
MIL-STD-129 Marking for Shipment and Storage
3
2.3 U.S. Federal Standard:
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—a group of wires having a center wire enclosed tightly by six helically placed outer wires with uniform pitch
of 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 April 1, 2012Sept. 1, 2012. Published May 2012October 2012. Originally approved in 1957. Last previous edition approved in 20102012 as
A416 – 10.A416/A416M – 12. DOI: 10.1520/A0416_A0416M-12.10.1520/A0416_A0416M-12A.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. 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.
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.
*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 ----------------------
A416/A416M − 12a
4. Ordering Information
4.1 It shall be the responsibility of the purchaser to specify all requirements that are necessary for material ordered under this
specification. Such requirements to be considered include, but are not limited to, the following:
4.1.1 Quantity (feet [metres]),
4.1.2 Nominal diameter of strand,
4.1.3 Grade of strand,
4.1.4 Type of strand,
4.1.5 Weldless, if desired (8.1)
4.1.6 Outside inspection, if required (11.1),
4.1.7 Load-elongation curve, if desired (13.2),
4.1.8 Packaging (14.1),
4.1.9 Supplementary Requirement S1, if desired, and
4.1.10 ASTM designation and year of issue.
5. Materials and M
...
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