Diffusion through sodium and polymer enhanced bentonites exposed to dilute and aggressive solutions

Chemical incompatibility between sodium bentonite (NaB) and aggressive waste solutions has led to the development of enhanced bentonites for geoenvironmental applications. Enhanced bentonites, such as bentonite-polyacrylic-acid composite (BPC), have been shown to maintain low enough values of hydraulic conductivity (e.g., Key words: bentonite-polymer composite, diffusion, enhanced bentonite, geosynthetic clay liner, leaching. L'incompatibilite chimique entre la bentonite de sodium (NaB) et les solutions de dechets agressives a conduit au developpement de bentonites ameliorees pour des applications geoenvironnementales. Il a ete demontre que les bentonites ameliorees, telles que le composite bentonite-acide polyacrylique (BPC), maintiennent des valeurs de conductivite hydraulique suffisamment basses (par exemple Mots-cles : composite bentonite-polymere, diffusion, bentonite amelioree, revetement d'argile geosynthetique, lixiviation.
Introduction Sodium bentonite (NaB) is an essential component in engineered barriers for many geoenvironmental containment applications (e.g., landfills, waste impoundments, radioactive waste disposal, vertical cutoff walls) (Gleason et al. 1997; [...]