000200355 001__ 200355
000200355 005__ 20181203023540.0
000200355 02470 $$2ISI$$a000344640100004
000200355 0247_ $$2doi$$a10.1680/geot.14.P.017
000200355 037__ $$aARTICLE
000200355 245__ $$aWater retention behaviour and microstructural evolution of MX-80 granular bentonite during wetting and drying cycles
000200355 269__ $$a2014
000200355 260__ $$c2014
000200355 336__ $$aJournal Articles
000200355 520__ $$aMX-80 bentonite used in engineered barrier systems would be subjected to wetting and drying cycles. To assess the response of the material under such circumstances, a comprehensive experimental characterisation of the water retention behaviour of compacted MX-80 granular bentonite was performed in this paper. A new methodology is proposed to investigate this behaviour under constant volume conditions for specimens prepared at different dry densities. The material was subjected to different hydraulic paths, including cyclic variations of the water content. As a result, an irreversible modification of the retention behaviour was observed when the material approached a fully saturated state during the first main wetting, and a new hydraulic domain was consequently created. The water retention capacity of the material increased as a result of such modification. Microstructural observations were performed at different stages of the hydraulic paths to relate the permanent change in the retention behaviour to the evolution of the fabric during the wetting and drying cycles. A clear transition from a double-structured to a single-structured fabric, followed by a permanent change of the microfabric, was found following the first wetting. Available data on the hydration of smectite particles were used to relate the microstructural evolution to the change in the water retention properties. This correlation shows the evolution of the active porosity at the particle level within the microstructure, which consequently affects the macroscopic response of the bentonite in terms of its water retention behaviour.
000200355 6531_ $$aclays
000200355 6531_ $$aexpansive soils
000200355 6531_ $$afabric/structure of soils
000200355 6531_ $$apartial saturation
000200355 6531_ $$aparticle-scale behaviour
000200355 6531_ $$aradioactive waste disposal
000200355 700__ $$0242689$$aSeiphoori, Ali$$g201460
000200355 700__ $$0242683$$aFerrari, Alessio$$g178175
000200355 700__ $$0240226$$aLaloui, Lyesse$$g105611
000200355 773__ $$j64$$k9$$q721-734$$tGeotechnique
000200355 8564_ $$s1654305$$uhttps://infoscience.epfl.ch/record/200355/files/2014_Seiphoori_et_al_Water_retention_Mx80_Geotechnique.pdf$$yn/a$$zn/a
000200355 909C0 $$0252080$$pLMS$$xU10264
000200355 909CO $$ooai:infoscience.tind.io:200355$$particle$$pENAC$$qGLOBAL_SET
000200355 917Z8 $$x178175
000200355 917Z8 $$x201460
000200355 917Z8 $$x178175
000200355 917Z8 $$x178175
000200355 917Z8 $$x148230
000200355 937__ $$aEPFL-ARTICLE-200355
000200355 973__ $$aEPFL$$rREVIEWED$$sPUBLISHED
000200355 980__ $$aARTICLE