ASTM A1061/A1061M-16
(Test Method)Standard Test Methods for Testing Multi-Wire Steel Prestressing Strand
Standard Test Methods for Testing Multi-Wire Steel Prestressing Strand
SIGNIFICANCE AND USE
4.1 The breaking strength and elongation of the strand are determined by one or more tensile tests in which fracture of the 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 severe bending, abrasion, or nicking of the strand during sampling.
4.3 Premature failure of the test specimens may result if there is appreciable notching, cutting, or bending of the specimen by the gripping devices of the testing machine.
4.4 Errors in testing will result if the wires constituting the strand are not loaded uniformly.
4.5 The mechanical properties of the strand will be materially affected by excessive heating during test specimen collection or preparation.
SCOPE
1.1 These test methods describe procedures for testing the mechanical properties of multi-wire steel prestressing strand.
1.2 These test methods are intended for use in evaluating specific strand properties prescribed in specifications for multi-wire steel prestressing strand, but they do not quantify acceptance criteria specified in the applicable specification for the strand being tested.
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 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 standard.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: A1061/A1061M −16
Standard Test Methods for
1
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.
1. Scope 3.1.1 breaking strength, n—maximum force at or after
which one or more wires fracture.
1.1 These test methods describe procedures for testing the
mechanical properties of multi-wire steel prestressing strand. 3.1.2 free span, n—the distance between the gripping jaws
occupiedbythelengthofstrandtobetestedinwhichthestrand
1.2 These test methods are intended for use in evaluating
is not contacted or detrimentally influenced by the gripping
specific strand properties prescribed in specifications for multi-
system.
wire steel prestressing strand, but they do not quantify accep-
tance criteria specified in the applicable specification for the 3.1.3 lay length, n—the axial distance required to make one
strand being tested.
complete revolution of any wire of a strand.
1.3 The values stated in either inch-pound units or SI units
3.1.4 strand, n—a group of two, three or seven steel wires
are to be regarded separately as standard. Within the text, the
woundtogetherinahelicalformwithuniformlaylengthofnot
SI units are shown in brackets. The values stated in each
less than 12 and not more than 16 times the nominal diameter
system may not be exact equivalents; therefore, each system
of the strand.
shall be used independently of the other. Combining values
3.1.5 yield strength, n—measured force at 1.0 % extension
from the two systems may result in non-conformance with the
under load (EUL).
standard.
1.4 This standard does not purport to address all of the
4. Significance and Use
safety concerns, if any, associated with its use. It is the
4.1 The breaking strength and elongation of the strand are
responsibility of the user of this standard to establish appro-
determined by one or more tensile tests in which fracture of the
priate safety and health practices and determine the applica-
specimen ideally occurs in the free span.
bility of regulatory limitations prior to use.
4.2 Mechanical properties of the strand will be negatively
2. Referenced Documents
affected if proper care is not taken to prevent damage such as
2
2.1 ASTM Standards: severe bending, abrasion, or nicking of the strand during
A370 Test Methods and Definitions for Mechanical Testing sampling.
of Steel Products
4.3 Premature failure of the test specimens may result if
E4 Practices for Force Verification of Testing Machines
there is appreciable notching, cutting, or bending of the
E83 Practice for Verification and Classification of Exten-
specimen by the gripping devices of the testing machine.
someter Systems
4.4 Errors in testing will result if the wires constituting the
E328 Test Methods for Stress Relaxation for Materials and
Structures strand are not loaded uniformly.
4.5 The mechanical properties of the strand will be materi-
3. Terminology
ally affected by excessive heating during test specimen collec-
3.1 Definitions of Terms Specific to This Standard:
tion or preparation.
5. Apparatus
1
These test methods are under the jurisdiction of ASTM Committee A01 on
Steel, Stainless Steel and Related Alloys and is the direct responsibility of
5.1 Tensile testing machine calibrated in accordance with
Subcommittee A01.05 on Steel Reinforcement.
Practices E4.
Current edition approved March 1, 2016. Published April 2016. Originally
approved in 2009. Last previous edition approved in 2009 as A1061/A1061M – 09.
5.2 Class B-1 extensometer as described in Practice E83.
DOI: 10.1520/A1061_A1061M-16.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5.3 Class D extensometer as described in Practice E83;
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
1
alternately, a linear dial gauge or ruler with precision of 6 ⁄16
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. in. [1.5 mm].
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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A1061/A1061M − 16
6. Sampling 8. Speed of Testing
6.1 Unless otherwise specified in the applicable specifica-
8.1 The speed of testing shall not be greater than that at
tion for the strand being tested, test specimens shall be taken
which load and strain readings can be made accurately. Refer
from the finished strand prior to packaging. The number of test
to speed of testing in Test Methods A370 on TestingAppara
...
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: A1061/A1061M − 09 A1061/A1061M − 16
Standard Test Methods for
1
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.
1. Scope
1.1 These test methods describe procedures for testing the mechanical as well as relaxation properties of multi-wire steel
prestressing strand.
1.2 These test methods are intended for use in evaluating specific strand properties prescribed in specifications for multi-wire
steel prestressing strand, but they do not quantify acceptance criteria specified in the applicable specification for the strand being
tested.
1.3 The values stated in either SIinch-pound units or inch-poundSI 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 standard.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
E4 Practices for Force Verification of Testing Machines
E83 Practice for Verification and Classification of Extensometer Systems
E328 Test Methods for Stress Relaxation for Materials and Structures
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 breaking strength, n—maximum force at or after which one or more wires fracture.
3.1.2 free span, n—the distance between the gripping jaws occupied by the length of strand to be tested in which the strand is
not contacted or detrimentally influenced by the gripping system.
3.1.3 length of lay, lay length, n—the axial distance required to make one complete revolution of any wire of a strand.
3.1.4 strand, n—two or morea group of two, three or seven steel wires wound together in a helical form.form with uniform lay
length of not less than 12 and not more than 16 times the nominal diameter of the strand.
3.1.5 yield strength, n—measured force at 1.0 % extension under load (EUL).
4. Significance and Use
4.1 The mechanical properties breaking strength and elongation of the strand are determined by a test one or more tensile tests
in which fracture of the specimen ideally occurs in the free span between the jaws of the testing machine.span.
4.2 Mechanical properties of the strand will be negatively affected if proper care is not taken to prevent damage such as severe
bending, abrasion, or nicking of the strand during sampling.
1
These test methods are 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 June 1, 2009March 1, 2016. Published June 2009April 2016. Originally approved in 2009. Last previous edition approved in 2009 as
A1061/A1061M – 09. DOI: 10.1520/A1061_A1061M-09.10.1520/A1061_A1061M-16.
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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
A1061/A1061M − 16
4.3 Premature failure of the test specimens may result if there is appreciable notching, cutting, or bending of the specimen by
the gripping devices of the testing machine.
4.4 Errors in testing will result if the wires constituting the strand are not loaded uniformly.
4.5 The mechanical properties of the strand will be materially affected by excessive heating during test specimen collection or
preparation.
4.6 Gripping difficulties will be minimized by following the suggested methods of gripping described in Section 7.
5. Apparatus
5.1 Tensile testtesting machine calibrated in accorda
...
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