Geosynthetic Clay Liners

Geosynthetic Clay Liners (GCL’s) are a composite material composed of a low-permeability sodium bentonite clay layer sandwiched between two layers of geotextile. When the bentonite layer becomes hydrated it swells to form a low permeability clay liner, restricting any further passage of liquids. GCL’s can provide approximately the same hydraulic protection as one metre of compacted clay.

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