ASTM A1061/A1061M-20ae1

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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Designation: A1061/A1061M −20a
Standard Test Methods for
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Testing Multi-Wire Steel Prestressing Strand
This standard is issued under the fixed designation A1061/A1061M; 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.
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ε NOTE—The research report footnote in Section 11 was editorially updated in August 2020.
1. Scope* E4 Practices for Force Verification of Testing Machines
E83 Practice for Verification and Classification of Exten-
1.1 These test methods describe procedures for testing the
someter Systems
mechanical properties of multi-wire steel prestressing strand.
E177 Practice for Use of the Terms Precision and Bias in
1.2 These test methods are intended for use in evaluating
ASTM Test Methods
specific strand properties prescribed in specifications for multi-
E328 Test Methods for Stress Relaxation for Materials and
wire steel prestressing strand, but they do not quantify accep-
Structures
tance criteria specified in the applicable specification for the
E691 Practice for Conducting an Interlaboratory Study to
strand being tested.
Determine the Precision of a Test Method
1.3 The values stated in either inch-pound units or SI units
3. Terminology
are to be regarded separately as standard. Within the text, the
SI units are shown in brackets. The values stated in each
3.1 Definitions of Terms Specific to This Standard:
system are not necessarily exact equivalents; therefore, to
3.1.1 breaking strength, n—maximum force at or after
ensure conformance with the standard, each system shall be
which one or more wires fracture.
used independently of the other, and values from the two
3.1.2 free span, n—the distance between the gripping jaws
systems shall not be combined.
occupiedbythelengthofstrandtobetestedinwhichthestrand
1.4 This standard does not purport to address all of the
is not contacted or detrimentally influenced by the gripping
safety concerns, if any, associated with its use. It is the
system.
responsibility of the user of this standard to establish appro-
3.1.3 lay length, n—the axial distance required to make one
priate safety, health, and environmental practices and deter-
complete revolution of any wire of a strand.
mine the applicability of regulatory limitations prior to use.
3.1.4 strand, n—a group of two, three or seven steel wires
1.5 This international standard was developed in accor-
woundtogetherinahelicalformwithuniformlaylengthofnot
dance with internationally recognized principles on standard-
less than 12 and not more than 16 times the nominal diameter
ization established in the Decision on Principles for the
of the strand.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical 3.1.5 yield strength, n—measured force at 1.0 % extension
Barriers to Trade (TBT) Committee. under load (EUL).
4. Significance and Use
2. Referenced Documents
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2.1 ASTM Standards: 4.1 The breaking strength and elongation of the strand are
determined by one or more tensile tests in which fracture of the
A370 Test Methods and Definitions for Mechanical Testing
of Steel Products specimen ideally occurs in the free span.
4.2 Mechanical properties of the strand will be negatively
affected if proper care is not taken to prevent damage such as
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These test methods are under the jurisdiction of ASTM Committee A01 on
severe bending, abrasion, or nicking of the strand during
Steel, Stainless Steel and Related Alloys and is the direct responsibility of
sampling.
Subcommittee A01.05 on Steel Reinforcement.
Current edition approved July 1, 2020. Published July 2020. Originally approved
4.3 Premature failure of the test specimens may result if
in 2009. Last previous edition approved in 2020 as A1061/A1061M – 20. DOI:
there is appreciable notching, cutting, or bending of the
10.1520/A1061_A1061M-20AE01.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or specimen by the gripping devices of the testing machine.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
4.4 Errors in testing will result if the wires constituting the
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. strand are not loaded uniformly.
*A Summary of Changes section appears at the end of this standard
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