ASTM D7205/D7205M-21
(Test Method)Standard Test Method for Tensile Properties of Fiber Reinforced Polymer Matrix Composite Bars
Standard Test Method for Tensile Properties of Fiber Reinforced Polymer Matrix Composite Bars
SIGNIFICANCE AND USE
5.1 This test method is designed to produce longitudinal tensile strength and elongation data. From a tension test, a variety of data are acquired that are needed for design purposes. Test factors relevant to the measured tensile response of bars include specimen preparation, specimen conditioning, environment of testing, specimen alignment and gripping, and speed of testing. Properties, in the test direction, that may be obtained from this test method include:
5.1.1 Maximum tensile force,
5.1.2 Ultimate tensile strength,
5.1.3 Ultimate tensile strain,
5.1.4 Tensile chord modulus of elasticity, and
5.1.5 Stress-strain curve.
SCOPE
1.1 This test method determines the quasi-static longitudinal tensile strength and elongation properties of fiber reinforced polymer matrix (FRP) composite bars commonly used as tensile elements in reinforced, prestressed, or post-tensioned concrete.
Note 1: Additional procedures for determining tensile properties of polymer matrix composites may be found in Test Methods D3039/D3039M and D3916.
1.2 Linear elements used for reinforcing Portland cement concrete are referred to as bars, rebar, rods, or tendons, depending on the specific application. This test method is applicable to all such reinforcements within the limitations noted in the method. The test articles are referred to as bars in this test method. In general, bars have solid cross-sections and a regular pattern of surface undulations or a coating of bonded particles, or both, that promote mechanical interlock between the bar and concrete. The test method is also appropriate for use with linear segments cut from a grid. Specific details for preparing and testing of bars and grids are provided. In some cases, anchors may be necessary to prevent grip-induced damage to the ends of the bar or grid. Suggestions for a grouted type of anchor are provided in Appendix X1.
1.3 The strength values provided by this method are short-term static strengths that do not account for sustained static or fatigue loading. Additional material characterization may be required, especially for bars that are to be used under high levels of sustained or repeated loading.
1.4 Units—The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.
1.4.1 Within the text, the inch-pound units are shown in brackets.
1.5 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.6 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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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.
Designation: D7205/D7205M − 21
Standard Test Method for
Tensile Properties of Fiber Reinforced Polymer Matrix
1
Composite Bars
This standard is issued under the fixed designation D7205/D7205M; 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 1.4.1 Within the text, the inch-pound units are shown in
brackets.
1.1 Thistestmethoddeterminesthequasi-staticlongitudinal
1.5 This standard does not purport to address all of the
tensile strength and elongation properties of fiber reinforced
safety concerns, if any, associated with its use. It is the
polymer matrix (FRP) composite bars commonly used as
responsibility of the user of this standard to establish appro-
tensile elements in reinforced, prestressed, or post-tensioned
priate safety, health, and environmental practices and deter-
concrete.
mine the applicability of regulatory limitations prior to use.
NOTE 1—Additional procedures for determining tensile properties of
1.6 This international standard was developed in accor-
polymer matrix composites may be found in Test Methods D3039/
dance with internationally recognized principles on standard-
D3039M and D3916.
ization established in the Decision on Principles for the
1.2 Linear elements used for reinforcing Portland cement
Development of International Standards, Guides and Recom-
concrete are referred to as bars, rebar, rods, or tendons,
mendations issued by the World Trade Organization Technical
depending on the specific application. This test method is
Barriers to Trade (TBT) Committee.
applicable to all such reinforcements within the limitations
noted in the method. The test articles are referred to as bars in
2. Referenced Documents
this test method. In general, bars have solid cross-sections and
2
2.1 ASTM Standards:
a regular pattern of surface undulations or a coating of bonded
D792 Test Methods for Density and Specific Gravity (Rela-
particles, or both, that promote mechanical interlock between
tive Density) of Plastics by Displacement
the bar and concrete. The test method is also appropriate for
D883 Terminology Relating to Plastics
use with linear segments cut from a grid. Specific details for
D3039/D3039M Test Method for Tensile Properties of Poly-
preparing and testing of bars and grids are provided. In some
mer Matrix Composite Materials
cases, anchors may be necessary to prevent grip-induced
D3878 Terminology for Composite Materials
damagetotheendsofthebarorgrid.Suggestionsforagrouted
D3916 Test Method for Tensile Properties of Pultruded
type of anchor are provided in Appendix X1.
Glass-Fiber-Reinforced Plastic Rod
1.3 The strength values provided by this method are short-
D5229/D5229M TestMethodforMoistureAbsorptionProp-
term static strengths that do not account for sustained static or
erties and Equilibrium Conditioning of Polymer Matrix
fatigue loading. Additional material characterization may be
Composite Materials
required, especially for bars that are to be used under high
D7957/D7957M Specification for Solid Round Glass Fiber
levels of sustained or repeated loading.
Reinforced Polymer Bars for Concrete Reinforcement
E4 Practices for Force Verification of Testing Machines
1.4 Units—The values stated in either SI units or inch-
E6 Terminology Relating to Methods of Mechanical Testing
pound units are to be regarded separately as standard. The
E83 Practice for Verification and Classification of Exten-
values stated in each system are not necessarily exact equiva-
someter Systems
lents; therefore, to ensure conformance with the standard, each
E122 Practice for Calculating Sample Size to Estimate,With
system shall be used independently of the other, and values
Specified Precision, the Average for a Characteristic of a
from the two systems shall not be combined.
Lot or Process
E456 Terminology Relating to Quality and Statistics
1
This test method is under the jurisidiction of ASTM Committee D30 on
Composite Materials and is the direct responsibility of Subcommittee D30.10 on
2
Composites for Civil Structures. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved May 15, 2021. Published June 2021. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 2006. Last previous edition approved in 2016 as D7205/ Standards volume information, refer to the standard’s Document Summary page on
D7205M – 06(2016). DOI: 10.1520/D7205_D7205M-21. the ASTM website.
Co
...
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: D7205/D7205M − 06 (Reapproved 2016) D7205/D7205M − 21
Standard Test Method for
Tensile Properties of Fiber Reinforced Polymer Matrix
1
Composite Bars
This standard is issued under the fixed designation D7205/D7205M; 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 This test method determines the quasi-static longitudinal tensile strength and elongation properties of fiber reinforced polymer
matrix (FRP) composite bars commonly used as tensile elements in reinforced, prestressed, or post-tensioned concrete.
NOTE 1—Additional procedures for determining tensile properties of polymer matrix composites may be found in test methodsTest Methods
D3039/D3039M and D3916.
1.2 Linear elements used for reinforcing Portland cement concrete are referred to as bars, rebar, rods, or tendons, depending on
the specific application. This test method is applicable to all such reinforcements within the limitations noted in the method. The
test articles are referred to as bars in this test method. In general, bars have solid cross-sections and a regular pattern of surface
undulations and/oror a coating of bonded particles particles, or both, that promote mechanical interlock between the bar and
concrete. The test method is also appropriate for use with linear segments cut from a grid. Specific details for preparing and testing
of bars and grids are provided. In some cases, anchors may be necessary to prevent grip-induced damage to the ends of the bar
or grid. Recommended details for the anchors Suggestions for a grouted type of anchor are provided in Annex A1Appendix X1.
1.3 The strength values provided by this method are short-term static strengths that do not account for sustained static or fatigue
loading. Additional material characterization may be required, especially for bars that are to be used under high levels of sustained
or repeated loading.
1.4 Units—The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in
each system mayare not benecessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be
used independently of the other. Combiningother, and values from the two systems may result in non-conformance with the
standard.shall not be combined.
1.4.1 Within the text, the inch-pound units are shown in brackets.
1.5 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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.6 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.
1
This test method is under the jurisidiction of ASTM Committee D30 on Composite Materials and is the direct responsibility of Subcommittee D30.10 on Composites
for Civil Structures.
Current edition approved Nov. 1, 2016May 15, 2021. Published November 2016June 2021. Originally approved in 2006. Last previous edition approved in 20112016 as
D7205/D7205M–06(2011).D7205/D7205M – 06(2016). DOI: 10.1520/D7205_D7205M-06R16.10.1520/D7205_D7205M-21.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D7205/D7205M − 21
2. Referenced Documents
2
2.1 ASTM Standards:
A615/A615M Specification for Deformed and Plain Carbon-Steel Bars for Concrete Reinforcement
D792 Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacement
D883 Terminology Relating to Plastics
D3039/D3039M Test Method for Tensile Properties of Polymer Matrix Composite Materials
D3171 Test Methods for Constituent Content of Composite Materials
D3878 Terminology for Composite Materials
D3916 Test Method for Tensile Properties of Pultruded Glass-Fiber-Reinforced Plastic Rod
D5229/D5229M Test Method for Moisture Absorption Properties and Equilibrium Conditioning of Polymer Matrix
...
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