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Journal Articles Engineering Geology Year : 2012

Experimental study on the swelling behaviour of bentonite/claystone mixture

Qiong Wang
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Anh Minh A.M. Tang
Yu-Jun Cui
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Pierre Delage

Abstract

A mixture of the MX80 bentonite and the Callovo-Oxfordian (COx) claystone were investigated by carrying out a series of experiments including determination of the swelling pressure of compacted samples by constant-volume method, pre-swell method, zero-swell method and swell-consolidation method. Distilled water, synthetic water and humidity controlled vapour were employed for hydration. Results show that upon wetting the swelling pressure increases with decreasing suction; however, there are no obvious effects of synthetic water chemistry and hydration procedure on the swelling behaviour in both short and long terms. For the same initial dry density, the swelling pressure decreases with increasing pre-swell strain; whereas there is a well defined logarithmic relation between the swelling pressure and final dry density of the sample regardless of the initial dry densities and the experimental methods. It was also found that swelling pressure depends on the loading-wetting conditions as a consequence of the different microstructure changes occurred in different conditions. Furthermore, it was attempted to elaborate a general relationship between the swelling pressure and the final dry density for various reference bentonites.
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hal-00655761 , version 1 (02-01-2012)

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Qiong Wang, Anh Minh A.M. Tang, Yu-Jun Cui, Pierre Delage, Behrouz Gatmiri. Experimental study on the swelling behaviour of bentonite/claystone mixture. Engineering Geology, 2012, 124, pp.59-66. ⟨10.1016/j.engeo.2011.10.003⟩. ⟨hal-00655761⟩
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