ASTM D6768/D6768M-19
(Test Method)Standard Test Method for Tensile Strength of Geosynthetic Clay Liners
Standard Test Method for Tensile Strength of Geosynthetic Clay Liners
SIGNIFICANCE AND USE
5.1 This test method may be used for the acceptance testing of commercial shipments of GCLs, but caution is advised since information about between-laboratory precision is incomplete. Comparative tests as directed in 5.1.1 may be advisable.
5.1.1 In cases of a dispute arising from differences in reported test results when using this test method for acceptance of shipments, the purchaser and the supplier should conduct comparative tests to determine if there is a statistical bias. The two parties should take a group of test samples that are as homogeneous as possible and which are from the lot of material in question.
5.2 Some modification of clamping techniques may be necessary for a given GCL, depending upon its structure. Specimen clamping may be modified as required at the discretion of the individual laboratory, provided a representative tensile strength is obtained. In any event, the procedure described in Section 10 of this test method for obtaining tensile strength must be maintained.
5.3 This test method is applicable for testing GCLs as received. It is used with a constant rate of extension type tension apparatus.
SCOPE
1.1 This test method establishes the procedures for the measurement of tensile strength of a geosynthetic clay liner (GCL). This test method is strictly an index test method to be used to verify the tensile strength of GCLs. Results from this test method should not be considered as an indication of actual or long-term performance of the geosynthetic(s) in field applications.
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. 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 nonconformance with the standard.
1.3 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.
1.4 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: D6768/D6768M − 19
Standard Test Method for
1
Tensile Strength of Geosynthetic Clay Liners
This standard is issued under the fixed designation D6768/D6768M; 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 D6072/D6072MPractice for Obtaining Samples of Geosyn-
thetic Clay Liners
1.1 This test method establishes the procedures for the
measurement of tensile strength of a geosynthetic clay liner
3. Terminology
(GCL). This test method is strictly an index test method to be
3.1 geosynthetic clay liner, n—a manufactured hydraulic
used to verify the tensile strength of GCLs. Results from this
barrier consisting of clay bonded to a layer or layers of
test method should not be considered as an indication of actual
geosynthetic material(s). D4439
or long-term performance of the geosynthetic(s) in field
applications. 3.2 For terminology of other terms used in this test method,
refer to Terminologies D123 and D4439.
1.2 The values stated in either SI units or inch-pound units
are to be regarded separately as standard. The values stated in
4. Summary of Test Method
each system may not be exact equivalents; therefore, each
4.1 A 100-mm [4-in.] wide specimen is gripped across its
system shall be used independently of the other. Combining
entirewidthintheclampsofaconstantrateofextension(CRE)
values from the two systems may result in nonconformance
type tensile testing machine operated at a prescribed rate of
with the standard.
extension, applying a longitudinal force to the specimen until
1.3 This standard does not purport to address all of the
the specimen ruptures.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
5. Significance and Use
priate safety, health, and environmental practices and deter-
5.1 This test method may be used for the acceptance testing
mine the applicability of regulatory limitations prior to use.
ofcommercialshipmentsofGCLs,butcautionisadvisedsince
1.4 This international standard was developed in accor-
information about between-laboratory precision is incomplete.
dance with internationally recognized principles on standard-
Comparative tests as directed in 5.1.1 may be advisable.
ization established in the Decision on Principles for the
5.1.1 In cases of a dispute arising from differences in
Development of International Standards, Guides and Recom-
reportedtestresultswhenusingthistestmethodforacceptance
mendations issued by the World Trade Organization Technical
of shipments, the purchaser and the supplier should conduct
Barriers to Trade (TBT) Committee.
comparative tests to determine if there is a statistical bias. The
two parties should take a group of test samples that are as
2. Referenced Documents
homogeneous as possible and which are from the lot of
2
2.1 ASTM Standards:
material in question.
D76/D76MSpecification for Tensile Testing Machines for
5.2 Some modification of clamping techniques may be
Textiles
necessary for a given GCL, depending upon its structure.
D123Terminology Relating to Textiles
Specimen clamping may be modified as required at the
D4439Terminology for Geosynthetics
discretion of the individual laboratory, provided a representa-
D5889/D5889MPractice for Quality Control of Geosyn-
tive tensile strength is obtained. In any event, the procedure
thetic Clay Liners
describedinSection10ofthistestmethodforobtainingtensile
strength must be maintained.
1
This test method is under the jurisdiction of ASTM Committee D35 on
Geosynthetics and is the direct responsibility of Subcommittee D35.04 on Geosyn-
5.3 This test method is applicable for testing GCLs as
thetic Clay Liners.
received. It is used with a constant rate of extension type
Current edition approved May 1, 2019. Published May 2019. Originally
tension apparatus.
approved in 2002. Last previous edition approved in 2018 as D6768/D6768M–18.
DOI: 10.1520/D6768_D6768M-19.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 6. Apparatus
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
6.1 Tensile Testing Machine—A constant rate of extension
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. (CRE) type of testing machine described in Specification
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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D6768/D6768M − 19
In these cases, the user should indicate the criteria at which elongation is
D76/D76Mshallbeusedwithaminimu
...
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: D6768/D6768M − 18 D6768/D6768M − 19
Standard Test Method for
1
Tensile Strength of Geosynthetic Clay Liners
This standard is issued under the fixed designation D6768/D6768M; 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 TheThis test method establishes the procedures for the measurement of tensile strength of a geosynthetic clay liner (GCL).
This test method is strictly an index test method to be used to verify the tensile strength of GCLs. Results from this test method
should not be considered as an indication of actual or long-term performance of the geosynthetic(s) in field applications.
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. 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 nonconformance with the standard.
1.3 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.
1.4 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.
2. Referenced Documents
2
2.1 ASTM Standards:
D76/D76M Specification for Tensile Testing Machines for Textiles
D123 Terminology Relating to Textiles
D4439 Terminology for Geosynthetics
D5889/D5889M Practice for Quality Control of Geosynthetic Clay Liners
D6072/D6072M Practice for Obtaining Samples of Geosynthetic Clay Liners
3. Terminology
3.1 geosynthetic, n—a product manufactured wholly or in part from polymeric material used with soil, rock, earth, or other
geotechnical engineering-related material as an integral part of a project, structure, or system. D4439
3.1 geosynthetic clay liner, n—a manufactured hydraulic barrier consisting of clay bonded to a layer or layers of geosynthetic
material(s). D4439
3.2 For terminology of other terms used in this test method, refer to Terminologies D123 and D4439.
4. Summary of Test Method
4.1 A 100-mm [4-in.] wide specimen is gripped across its entire width in the clamps of a constant rate of extension (CRE) type
tensile testing machine operated at a prescribed rate of extension, applying a longitudinal force to the specimen until the specimen
ruptures.
5. Significance and Use
5.1 This test method may be used for the acceptance testing of commercial shipments of GCLs, but caution is advised since
information about between-laboratory precision is incomplete. Comparative tests as directed in 5.1.1 may be advisable.
1
This test method is under the jurisdiction of ASTM Committee D35 on Geosynthetics and is the direct responsibility of Subcommittee D35.04 on Geosynthetic Clay
Liners.
Current edition approved June 1, 2018May 1, 2019. Published June 2018May 2019. Originally approved in 2002. Last previous edition approved in 20152018 as
ɛ2
D6768/D6768M – 04 (2015)D6768/D6768M – 18. . DOI: 10.1520/D6768_D6768M-18.10.1520/D6768_D6768M-19.
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 ----------------------
D6768/D6768M − 19
5.1.1 In cases of a dispute arising from differences in reported test results when using this test method for acceptance of
shipments, the purchaser and the supplier should conduct comparative tests to determine if there is a statistical bias. The two parties
should take a group of test samples that are as homogeneous as possible and which are from the lot of material in question.
5.2 Some modification of clamping techniques may be necessary for a given GCL, depending upon its structure. Specim
...
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