Geosynthetic Clay Liner Testing (GCL)Geosynthetic clay liners consist of a layer of high swelling sodium bentonite, woven between two geotextile layers. The bentonite swells and extrudes through the geotextile fabric at the overlap, forming a seal by producing a dense and uniform clay barrier with the same hydraulic qualities in all parts of the clay liner. GCLs have low hydraulic conductivity (permeability) and have the ability to self-repair rips or tears, due to the swelling properties of the bentonite.
| Type of test / Properties measured / Range of measurement | Standard Specifications |
| Index flux using a flexible wall permeameter |
ASTM D 5887 |
| Calculation of hydraulic conductivity using index flux test data |
ASTM D 5887 |
| Swell index of clay mineral component |
ASTM D 5890 |
| Mass per unit area | ASTM D 5993 |
| Peel strength | Documented In-House Method No 7 : based on ASTM D 4632 |
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