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Kreft, A.; Sikora, Z.; Wijeyesekera, D.Chitral (2009)
Languages: English
Types: Unknown
Subjects:

Classified by OpenAIRE into

mesheuropmc: inorganic chemicals, complex mixtures
Bentonite clay liners are used as a barrier material for water, chemicals and gas in civil engineering structures such as engineered landfills and in structural water proofing. Bentonic clays absorb water and expand greater than any other ordinary plastic clay. The expansiveness of the clay is characterised by the absorbed cation in the clay and the geochemical environment. This paper critically investigates factors that contribute to the swelling characteristics of bentonite clay and its products. It takes particular view on different types of bentonite used in clay liners and their interaction with saline ground water conditions. The swelling pressure of sodium bentonite in deionised water is demonstrated to be very high. However when it is in a saline environment the magnitude of swelling pressure can be less than halved. A parallel observation is noted under conditions of free swell. These are explained as being a consequence of reduction in the double layer thickness which is further reflected in the reduction of cationexchange capacity when the bentonite is in a saline environment. Variations in cation exchange capacity, consistency limit and free swell of the bentonite products in different saline environment are observed and its significance discussed.
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