Geosynthetic Clay Liner
Geosynthetic Clay Liners allow the placement of a thin layer of high quality bentonite as a replacement for thick compacted clay liners.
Geosynthetic Clay Liners (GCL's) are composites that combine geotextile outer layers with a core of low-permeability sodium bentonite clay. Bentonite is a natural sealant, which actuates (hydrates) on contact with water. Geosynthetic Clay Liners are used as a replacement for compacted clay liners. Upon hydration, the bentonite in the GCL swells to form a low permeability clay liner with a hydraulic conductiivity of less than 5 x 10-9 cm/sec. As a result, GCL's can provide approximately the same hydraulic protection as one metre of compacted clay.
A Geosynthetic Clay Liner is a good choice as one of the components of a composite liner system in landfills or other critical containment systems. Geosynthetic Clay Liners are also good for seepage control in water containment, or in lightly contaminated water containment applications. GCL’s must be backfilled to provide confinement pressure in order to develop their full potential for impermeability.
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