Geosynthetic clay liners (GCL) are manufactured hydraulic barriers consisting of a layer of bentonite or other very low-permeability material supported by geotextiles and/or geomembranes, most products are mechanically held together by needle-punching, with a few products stitched together and a few using chemical adhesives.
Geosynthetic clay liners (GCL) offer advantages for containment applications and Compacted Clay Liners (CCL). GCL liners have numerous advantages compared to Compacted Clay liners (CCL) in terms of low hydraulic conductivity. GCL liners are less expensive, and require less skilled labor for installation than CCL liners. GCL liners also occupy less depth in the soil base compared to CCL (i.e. less shipping costs and less excavation of the native soil). During freeze/thaw cycles, GCL liners have good resistance hence it can be easily rectified.
Geosynthetic clay liners (GCLs) are an established sealing product in the geoenvironmental industry. They are used in landfill caps and base liner applications under roads, railways, secondary containment for above ground tank farms, as well as within various other containment structures such as dams, canals, ponds, rivers and lakes. They are also used for waterproofing of buildings and other similar structures.