Geosynthetic clay liners (GCLs) are widely used as hydraulic barrier to isolate waste disposal facilities thanks to their low permeability to water. In the field, the efficiency of GCLs can be altered by cation exchange and highly concentrated solutions during contact with aggressive liquids and by desiccation caused by temperature changes. As a consequence, wet and dry cycles lead to loss of swelling ability and cracking of the bentonite with possible loss of hydraulic efficiency and contamination of the surrounding ground. Swell pressure tests were performed to inspect the effect of wet and dry cycles with seawater on the swelling ability of untreated bentonite and a polymer modified bentonite, HYPER clay Experimental results of untreated bentonite were back analyzed with a theoretical model to estimate the equilibrium concentration. Test results showed that HYPER clay presented improved behaviour in terms of swelling ability through the cycles.

Impact of wet-dry cycles on the swell pressure of a polymer modified bentonite and theoretical interpretation of experimental results / De Camillis, M.; Di Emidio, G.; Bezuijen, A.; Verástegui-Flores, R. D.; Dominijanni, A.; Manassero, M.. - ELETTRONICO. - (2017), pp. 3115-3118. (Intervento presentato al convegno 19th International Conference on Soil Mechanics and Geotechnical Engineering tenutosi a Seoul, Korea nel 17-22 September 2017).

Impact of wet-dry cycles on the swell pressure of a polymer modified bentonite and theoretical interpretation of experimental results

Dominijanni A.;Manassero M.
2017

Abstract

Geosynthetic clay liners (GCLs) are widely used as hydraulic barrier to isolate waste disposal facilities thanks to their low permeability to water. In the field, the efficiency of GCLs can be altered by cation exchange and highly concentrated solutions during contact with aggressive liquids and by desiccation caused by temperature changes. As a consequence, wet and dry cycles lead to loss of swelling ability and cracking of the bentonite with possible loss of hydraulic efficiency and contamination of the surrounding ground. Swell pressure tests were performed to inspect the effect of wet and dry cycles with seawater on the swelling ability of untreated bentonite and a polymer modified bentonite, HYPER clay Experimental results of untreated bentonite were back analyzed with a theoretical model to estimate the equilibrium concentration. Test results showed that HYPER clay presented improved behaviour in terms of swelling ability through the cycles.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2693804
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