Geosynthetic clay liners (GCLs) are often used as barriers for landfill liners and cover systems due to the high swelling ability of the bentonite in water that results in low hydraulic conductivity. However, contact with electrolyte solutions and leachate can impede the osmotic swelling of the bentonite and cause an increase in both liquid and contaminant flux through the GCL.
In this framework, different modified bentonites (e.g. multiswellable bentonite, dense pre-hydrated GCL, HYPER clay) have been developed to improve their chemical resistance in aggressive environments.
The purpose of this paper is to provide an overview of the hydraulic performance of the recently developed chemically modified bentonites subjected to wet and dry cycles.
Hydraulic conductivity results of modified bentonites are promising. However, the enhanced performance may still be impaired with aggressive solutions after wet and dry cycles.
Bentonite Hydraulic conductivity Modified bentonites Wet and dry cycles
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