ASTM D6768/D6768M-18
(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 The 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 − 18
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 The 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, n—a product manufactured wholly or in
used to verify the tensile strength of GCLs. Results from this
part from polymeric material used with soil, rock, earth, or
test method should not be considered as an indication of actual
other geotechnical engineering-related material as an integral
or long-term performance of the geosynthetic(s) in field
part of a project, structure, or system. D4439
applications.
3.2 geosynthetic clay liner, n—a manufactured hydraulic
1.2 The values stated in either SI units or inch-pound units
barrier consisting of clay bonded to a layer or layers of
are to be regarded separately as standard. The values stated in
geosynthetic material(s). D4439
each system may not be exact equivalents; therefore, each
3.3 For terminology of other terms used in this test method,
system shall be used independently of the other. Combining
refer to Terminologies D123 and D4439.
values from the two systems may result in nonconformance
with the standard.
4. Summary of Test Method
1.3 This standard does not purport to address all of the
4.1 A 100-mm [4-in.] wide specimen is gripped across its
safety concerns, if any, associated with its use. It is the
entirewidthintheclampsofaconstantrateofextension(CRE)
responsibility of the user of this standard to establish appro-
type tensile testing machine operated at a prescribed rate of
priate safety, health, and environmental practices and deter-
extension, applying a longitudinal force to the specimen until
mine the applicability of regulatory limitations prior to use.
the specimen ruptures.
1.4 This international standard was developed in accor-
dance with internationally recognized principles on standard-
5. Significance and Use
ization established in the Decision on Principles for the
5.1 This test method may be used for the acceptance testing
Development of International Standards, Guides and Recom-
ofcommercialshipmentsofGCLs,butcautionisadvisedsince
mendations issued by the World Trade Organization Technical
information about between-laboratory precision is incomplete.
Barriers to Trade (TBT) Committee.
Comparative tests as directed in 5.1.1 may be advisable.
2. Referenced Documents 5.1.1 In cases of a dispute arising from differences in
2 reportedtestresultswhenusingthistestmethodforacceptance
2.1 ASTM Standards:
of shipments, the purchaser and the supplier should conduct
D76/D76MSpecification for Tensile Testing Machines for
comparative tests to determine if there is a statistical bias. The
Textiles
two parties should take a group of test samples that are as
D123Terminology Relating to Textiles
homogeneous as possible and which are from the lot of
D4439Terminology for Geosynthetics
material in question.
D5889/D5889MPractice for Quality Control of Geosyn-
thetic Clay Liners 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
1
This test method is under the jurisdiction of ASTM Committee D35 on
discretion of the individual laboratory, provided a representa-
Geosynthetics and is the direct responsibility of Subcommittee D35.04 on Geosyn-
thetic Clay Liners.
tive tensile strength is obtained. In any event, the procedure
Current edition approved June 1, 2018. Published June 2018. Originally
describedinSection10ofthistestmethodforobtainingtensile
approved in 2002. Last previous edition approved in 2015 as D6768/D6768M–04
ɛ2
strength must be maintained.
(2015) . DOI: 10.1520/D6768_D6768M-18.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5.3 This test method is applicable for testing GCLs as
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
received. It is used with a constant rate of extension type
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. tension apparatus.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D6768/D6768M
...
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.
´2
Designation: D6768/D6768M − 04 (Reapproved 2015) D6768/D6768M − 18
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
ε NOTE—Units information was corrected editorially in February 2015.
2
ε NOTE—Footnote 1 was corrected editorially in July 2015.
1. Scope
1.1 The test method establishes the procedures for the measurement of tensile strength of Geosynthetic Clay Liner 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 non-conformancenonconformance with the standard.
1.3 This standard may involve hazardous materials, operations, and equipment. 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.
1.4 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
3
D2905 Practice for Statements on Number of Specimens for Textiles (Withdrawn 2008)
D4439 Terminology for Geosynthetics
D5889D5889/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 engineering-related material as an integral part of a project, structure, or system. D4439
3.2 geosynthetic clay liner, n—a manufactured hydraulic barrier consisting of clay bonded to a layer or layers of geosynthetic
material(s). D4439
3.3 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 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.
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 Jan. 15, 2015June 1, 2018. Published February 2015June 2018. Originally approved in 2002. Last previous edition approved in 20092015 as
ɛ2
D6768D6768/D6768M – 04 (2015) –04 (2009). . DOI: 10.1520/D6768_D6768M-04R15E02.10.1520/D6768_D6768M-18.
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 − 18
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.
5.1.1 In cases of a dispute arising from differences in reported test results when using this t
...
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