ASTM D6768/D6768M-20
(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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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: D6768/D6768M − 20
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 Definitions:
used to verify the tensile strength of GCLs. Results from this
3.1.1 geosynthetic clay liner, n—a manufactured hydraulic
test method should not be considered as an indication of actual
barrier consisting of clay bonded to a layer or layers of
or long-term performance of the geosynthetic(s) in field
geosynthetic material(s). D4439
applications.
3.2 For terminology of other terms used in this test method,
1.2 The values stated in either SI units or inch-pound units
refer to Terminologies D123 and D4439.
are to be regarded separately as standard. The values stated in
each system may not be exact equivalents; therefore, each
4. Summary of Test Method
system shall be used independently of the other. Combining
4.1 A 100-mm [4-in.] wide specimen is gripped across its
values from the two systems may result in nonconformance
entirewidthintheclampsofaconstantrateofextension(CRE)
with the standard.
type tensile testing machine operated at a prescribed rate of
1.3 This standard does not purport to address all of the
extension, applying a longitudinal force to the specimen until
safety concerns, if any, associated with its use. It is the
the specimen ruptures.
responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter-
5. Significance and Use
mine the applicability of regulatory limitations prior to use.
5.1 This test method may be used for the acceptance testing
1.4 This international standard was developed in accor-
ofcommercialshipmentsofGCLs,butcautionisadvisedsince
dance with internationally recognized principles on standard-
information about between-laboratory precision is incomplete.
ization established in the Decision on Principles for the
Comparative tests as directed in 5.1.1 may be advisable.
Development of International Standards, Guides and Recom-
5.1.1 In cases of a dispute arising from differences in
mendations issued by the World Trade Organization Technical
reportedtestresultswhenusingthistestmethodforacceptance
Barriers to Trade (TBT) Committee.
of shipments, the purchaser and the supplier should conduct
comparative tests to determine if there is a statistical bias. The
2. Referenced Documents
two parties should take a group of test samples that are as
2
2.1 ASTM Standards:
homogeneous as possible and which are from the lot of
D76/D76MSpecification for Tensile Testing Machines for
material in question.
Textiles
5.2 Some modification of clamping techniques may be
D123Terminology Relating to Textiles
necessary for a given GCL, depending upon its structure.
D4439Terminology for Geosynthetics
Specimen clamping may be modified as required at the
D5889/D5889MPractice for Quality Control of Geosyn-
discretion of the individual laboratory, provided a representa-
thetic Clay Liners
tive tensile strength is obtained. In any event, the procedure
describedinSection10ofthistestmethodforobtainingtensile
1
This test method is under the jurisdiction of ASTM Committee D35 on
strength must be maintained.
Geosynthetics and is the direct responsibility of Subcommittee D35.04 on Geosyn-
thetic Clay Liners.
5.3 This test method is applicable for testing GCLs as
Current edition approved May 1, 2020. Published May 2020. Originally
received. It is used with a constant rate of extension type
approved in 2002. Last previous edition approved in 2019 as D6768/D6768M–19.
DOI: 10.1520/D6768_D6768M-20. tension apparatus.
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
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D6768/D6768M − 20
6. Atmospheric Conditions 10.3 Insertion of Specimen in Cl
...
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 − 19 D6768/D6768M − 20
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 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.
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 clay liner, n—a manufactured hydraulic barrier consisting of clay bonded to a layer or layers of geosynthetic
material(s). D4439
3.1 Definitions:
3.1.1 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 May 1, 2019May 1, 2020. Published May 2019May 2020. Originally approved in 2002. Last previous edition approved in 20182019 as
D6768/D6768M – 18.D6768/D6768M – 19. DOI: 10.1520/D6768_D6768M-19.10.1520/D6768_D6768M-20.
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 − 20
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 labo
...
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