Modification of the microstructure of a compacted expansive clay upon wetting

Abstract : This study is focused on the hydromechanical behaviour of a compacted swelling clay upon wetting. More precisely, a multi-scale investigation of the swelling behaviour of a purified bentonite under constrained conditions was carried out by a monitoring of the swelling pressure and the porosity evolution at various scales (inter-aggregate, inter-particle, interlayer). A specific oedo-tomometer, has been designed to monitor both the swelling pressure and the inter-aggregate porosity evolution deduced from microfocus X-ray computed tomography measurements (size higher than 5 µm). The results showed the influence of hydration on specimens with an increase of the swelling pressure and a decrease of the inter-aggregate pore size during hydration. Therefore, a coupling between swelling pressure and textural reorganisation at inter-aggregate pore scale was highlighted. This coupling was also based on hydration process at interlayer scale.
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Contributor : Olivier Cuisinier <>
Submitted on : Tuesday, April 17, 2018 - 11:35:19 AM
Last modification on : Monday, March 11, 2019 - 12:24:03 PM

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  • HAL Id : hal-01754085, version 1

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Olivier Cuisinier, Luc Massat, Farimah Masrouri, Stéphane Gaboreau, Francis Claret, et al.. Modification of the microstructure of a compacted expansive clay upon wetting. 19th International Conference on Soil Mechanics and Geotechnical Engineering, Sep 2017, Séoul, South Korea. pp.1015-1018. ⟨hal-01754085⟩

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