Active Standard ASTM D6768 | Developed by Subcommittee: D35.04
Book of Standards Volume: 04.13
Historical (view previous versions of standard)
Significance and Use
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.
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.
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 providing 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.
This test method is applicable for testing GCLs as received. It is used with a constant rate of extension type tension apparatus.
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.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D76 Specification for Tensile Testing Machines for Textiles
D123 Terminology Relating to Textiles
D2905 Practice for Statements on Number of Specimens for Textiles
D4439 Terminology for Geosynthetics
D5889 Practice for Quality Control of Geosynthetic Clay Liners
D6072 Practice for Obtaining Samples of Geosynthetic Clay Liners
ICS Number Code 59.080.70 (Geotextiles)