Значение и использование

GCLs must be properly manufactured in a manner consistent with a minimum level of quality control as determined by in-house testing of the final product. This practice suggests the types of tests, the methods of the testing and the minimum testing frequencies.

It should be clearly recognized that manufacturers may perform additional tests or at greater frequency than required in this practice, or both. In this case, the manufacturer's quality control plan will then take precedence over this practice. The quoted tests and test methods in Table 1 must appear in the QC plan and the QC report.

It should also be recognized that purchasers and installers of GCLs may require additional tests or at a great frequency than called for in this practice, or both. The organization(s) producing such project specific specification or quality assurance plan should recognize that such requirements are beyond the current state of the practice. If such a request is made by purchasers or installers, they should clearly communicate the requirements to the manufacturer or supplier during the contract decisions in order that disputes do not arise at a subsequent time.

TABLE 1 Minimum Types of Tests and Their Frequencies for the QC of GCLs

Test DesignationTest MethodFrequency of TestingReport Value Clay:^AB Free swellD 5890One per truck or railcar but min, every 50 tonnesMinimum average Fluid lossD 5891One per truck or railcar but min, every 50 tonnesMinimum average Geosynthetic Materials:^B Geotextiles: Mass per unit areaD 526120 000 m² (200 000 ft²)Typical and MARV Grab tensile strength (MD and CD)D 463220 000 m² (200 000 ft²)MARV Geomembrane Mass per unit areaD 526120 000 m² (100 000 ft²)Typical and MARV ThicknessD 519920 000 m² (200 000 ft²)MARV Tensile strength at break and yield (MD and CD)D 63820 000 m² (200 000 ft²)MARV Finished GCL:^C Clay mass per unit area (dried)^DD 59934000 m² (40 000 ft²)MARV Clay moisture contentD 46434000 m² (40 000 ft²)Average value^E Grab tensile strength (MD and CD)^FD 463220 000 m² (200 000 ft²)MARV Index flux^BD 5887Once weekly with the last 20 values reported^GMaximum value

^A The tests on the bentonite are to be performed on the as-received material before fabrication into the GCL product.

^B Cert letter from component manufacturer or QA from GCL manufacturer, or both. Cert letters must arrive and be checked before the components are used for the GCL production.

^C Components from finished GCL product should not be separated and tested, because the production process may alter the properties of the components.

^D Dried bentonite should be defined as 0 % moisture content.

^E Only for information.

^F This test may not be applicable for geomembrane-backed GCLs.

^G The last 20 values to be reported should end at the production date of the supplied GCL. If the manufacturer has more production facilities or production lines, or both, the tests must be performed and reported for each line.

Область применения

1.1 This practice covers the manufacturing quality control of geosynthetic clay liners (GCLs), describing types of tests, the proper test methods, and the minimum testing frequencies.

1.2 This practice is intended to aid manufacturers, suppliers, purchasers and users of GCLs in establishing a minimum level of effort for manufacturing quality control.

1.3 This practice does not address manufacturing quality assurance, product acceptance testing, or conformance testing. These are independent activities taken by organizations other than the GCL manufacturer.

1.4 The values stated in SI units are to be regarded as the standard. The inch-pound units given in parentheses are for information only.

1.5 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.