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- W2013110046 abstract "Highly compacted bentonite-based materials are often considered as buffer or sealing materials for deep high-level radioactive waste repositories. In situ, the initial state of bentonite-based materials is only partially saturated, which has a very high suction that will promote water absorption from the host rock. In addition, a gradient of water saturation will be formed between the external part and the central part of the compacted bentonite blocks. In this paper, water retention tests, under both constant-volume and free-swelling conditions, were performed to investigate the suction behavior of a compacted bentonite/sand mixture. In order to investigate the sealing ability of the partially saturated bentonite/sand mixture, gas permeability tests were also carried out under the in situ confining stress. It was found that the confining conditions have a limited effect on the water retention capacity of the compacted bentonite/sand mixture at lower levels of relative humidity (RH), while this influence is significant at higher RH levels. The results of gas permeability tests show that gas permeability is very sensitive to the water content and the confining pressure. When the sample (stable at RH=98%) was subjected to a in situ confining pressure (7–8 MPa), the gas permeability was very low (1.83×10–14 m/s) which indicates that gas tightness can be obtained even though the sample is not fully saturated." @default.
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- W2013110046 date "2014-10-01" @default.
- W2013110046 modified "2023-09-28" @default.
- W2013110046 title "Experimental research on water retention and gas permeability of compacted bentonite/sand mixtures" @default.
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- W2013110046 doi "https://doi.org/10.1016/j.sandf.2014.09.011" @default.
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