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Water retention behaviour of compacted bentonites: experimental observations and constitutive model
Dieudonné, Anne-Catherine; Gatabin, Claude; Talandier, Jean et al.
2016In Delage, Pierre; Cui, Yu-Jun; Ghabezloo et al. (Eds.) 3rd European Conference on Unsaturated Soils – “E-UNSAT 2016”
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Abstract :
[en] Bentonite-based materials are studied as potential barriers for the geological disposal of radioactive waste. In this context, the hydro-mechanical behaviour of the engineered barrier is first characterized by free swelling conditions followed by constant volume conditions. This paper presents an experimental study conducted in order to characterize the water retention behaviour of a compacted MX-80 bentonite/sand mixture. Then, based on observations of the material double structure and the water retention mechanisms in compacted bentonites, a new water retention model is proposed. The model considers adsorbed water in the microstructure and capillary water in the aggregate-porosity. The model is calibrated and validated against the experimental data. It is used for better understanding competing effects between volume change and water uptake observed during hydration under free swelling conditions.
Disciplines :
Civil engineering
Materials science & engineering
Geological, petroleum & mining engineering
Author, co-author :
Dieudonné, Anne-Catherine  ;  Université de Liège > Département ArGEnCo > Géomécanique et géologie de l'ingénieur
Gatabin, Claude
Talandier, Jean
Collin, Frédéric  ;  Université de Liège > Département ArGEnCo > Géotechnique
Charlier, Robert ;  Université de Liège > Département ArGEnCo > Géomécanique et géologie de l'ingénieur
Language :
English
Title :
Water retention behaviour of compacted bentonites: experimental observations and constitutive model
Publication date :
2016
Event name :
3rd European Conference on Unsaturated Soils – “E-UNSAT 2016”
Event date :
du 12 septembre 2016 au 14 septembre 2016
Audience :
International
Main work title :
3rd European Conference on Unsaturated Soils – “E-UNSAT 2016”
Author, co-author :
Delage, Pierre
Cui, Yu-Jun
Ghabezloo
Pereira, Jean-Michel
Tang, Anh-Minh
Peer reviewed :
Peer reviewed
Available on ORBi :
since 15 September 2016

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