Selected factors affecting measurement of the hydraulic conductivity of geosynthethic clay liners
Geosynthetic clay liners (GCLs) are thin (~7 to 10 mm), factory manufactured hydraulic barriers typically comprising a layer of sodium bentonite sandwiched between two geotextiles. Upon hydration and permeation with water at low effective stress (σ´) (e.g., typically ≤ ~30 kPa [4 psi]), the bentonite in GCLs, which typically is initially in an air-dried condition, swells to form a low hydraulic conductivity (k) layer (i.e., k of ~2-3×10-11 m/s) that is suitable for use as a barrier in hydraulic and chemical containment applications. However, adverse physico-chemical interactions between the ...
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