ASTM D6768-03

Standard Test Method for Tensile Strength of Geosynthetic Clay Liners

SCOPE
1.1 The test method establishes the procedures for the measurement of tensile strength of 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 in SI units are to be regarded as the standard. Values in pound units are in parentheses for information.
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 and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 09-Feb-2003
• ICS: 59.080.70 - Geotextiles
• Technical Committee: D35 - Geosynthetics
• Drafting Committee: D35.04 - Geosynthetic Clay Liners

Relations

• Replaces: ASTM D6768-02 - Standard Test Method for Tensile Strength of Geosynthetic Clay Liners
• Effective Date: 10-Feb-2003
• Replaced By: ASTM D6768-04 - Standard Test Method for Tensile Strength of Geosynthetic Clay Liners
• Effective Date: 01-Jun-2004

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D 6768 – 03
Standard Test Method for
1
Tensile Strength of Geosynthetic Clay Liners
This standard is issued under the fixed designation D 6768; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3.2 geosynthetic clay liner, n—a manufactured hydraulic
barrier consisting of clay bonded to a layer or layers of
1.1 The test method establishes the procedures for the
geosynthetic material(s).
measurement of tensile strength of Geosynthetic Clay Liner
3.3 For terminology of other terms used in this test method,
(GCL). This test method is strictly an index test method to be
refer to Terminologies D 123 and D 4439.
used to verify the tensile strength of GCLs. Results from this
test method should not be considered as an indication of actual
4. Summary of Test Method
or long-term performance of the geosynthetic(s) in field
4.1 A 100 mm (4-in). wide specimen is gripped across its
applications.
entire width in the clamps of a constant rate of extension (CRE)
1.2 The values in SI units are to be regarded as the standard.
type tensile testing machine operated at a prescribed rate of
Values in pound units are in parentheses for information.
extension, applying a longitudinal force to the specimen until
1.3 This standard may involve hazardous materials, opera-
the specimen ruptures.
tions, and equipment. This standard does not purport to
address all of the safety concerns, if any, associated with its
5. Significance and Use
use. It is the responsibility of the user of this standard to
5.1 This test method may be used for the acceptance testing
establish appropriate safety and health practices and deter-
of commercial shipments of GCLs but caution is advised since
mine the applicability of regulatory limitations prior to use.
information about between-laboratory precision is incomplete.
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
2.1 ASTM Standards:
reported test results when using this test method for acceptance
D 76 Specification for Tensile Testing Machines for Tex-
2
of shipments, the purchaser and the supplier should conduct
tiles
2 comparative tests to determine if there is a statistical bias. The
D 123 Terminology Relating to Textiles
two parties should take a group of test samples that are as
D 2905 Practice for Statements on Number of Specimens
2 homogeneous as possible and which are from the lot of
for Textiles
3 material in question.
D 4439 Terminology for Geosynthetics
5.2 Some modification of clamping techniques may be
D 5889 Practice for Quality Control of Geosynthetic Clay
3 necessary for a given GCL depending upon its structure.
Liners
Specimen clamping may be modified as required at the
D 6072 Guide for Obtaining Samples of Geosynthetic Clay
3 discretion of the individual laboratory providing a representa-
Liners
tive tensile strength is obtained. In any event, the procedure
3. Terminology described in Section 10 of this test method for obtaining tensile
strength must be maintained.
3.1 geosynthetic, n—a product manufactured wholly or in
5.3 This test method is applicable for testing GCLs as
part from polymeric material used with soil, rock, earth, or
received. It is used with a constant rate of extension type
other geotechnical engineering related material as an integral
tension apparatus.
part of a project, structure, or system. D 4439
6. Apparatus
1
This test method is under the jurisdiction of ASTM Committee D35 on 6.1 Tensile Testing Machine, a constant rate of extension
Geosynthetics and is the direct responsibility of Subcommittee D35.04 on Geosyn-
(CRE) type of testing machine described in Specification D 76
thetic Clay Liners.
shall be used with a minimum precision measuring capability
Current edition approved Feb. 10, 2003. Published April 2003. Originally
-4
of 0.1 N/m (5.71 3 10 lbf/in.).
approved in 2002. Last previous edition approved in 2002 as D 6768–02.
2
Annual Book of ASTM Standards, Vol 07.01.
3
Annual Book of ASTM Standards, Vol 04.13.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
D6768–03
6.2 Clamps, the clamps shall be a minimum 25 by 100 mm 9.4.2 If a specimen slips in the jaws, or if for any reason
(1 by 4 in.) and with appropriate clamping power to prevent attributable to faulty operation the results fall significantly
slipping or crushing (damage). below the average for the set of specimens, discard the results
6.3 Die or Template, 100 by 20
...