Thermochemical changes on swelling pressure of compacted bentonite

Kim, Minseop; Lee, Seung-Rae; Cheon, Enok; Kim, Minjun; Yoon, Seok

doi:10.1016/j.anucene.2020.107882

Cited by 12 publications

(3 citation statements)

References 39 publications

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“…A similar phenomenon also indicated by some related studies [5,54]. Nevertheless, other tests also showed the swelling pressure decreased with the increasing temperature [55][56][57][58]. In contrast, some studies have shown opposite effects of temperature on differ bentonite types, such as heating leading to an increase in the swelling pressure of In contrast, some studies have shown opposite effects of temperature on different bentonite types, such as heating leading to an increase in the swelling pressure of Na-based bentonite and a decrease in the swelling pressure of Ca-based bentonite [59].…”

Section: Effect Of Temperature On the Swelling Pressuresupporting

confidence: 86%

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Research Progress on the Influence of Thermo-Chemical Effects on the Swelling Pressure of Bentonite

Liu

Yao

et al. 2023

Applied Sciences

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The swelling pressure of bentonite changes dramatically due to diffused nuclear radiation heat and underground osmosis, causing the failure of the buffer isolation layer in deep geological repositories for the disposal of high-level radioactive waste. A detailed overview of the relevant research results on the swelling pressure variation of bentonite under thermo-chemical effects is presented in this paper. The results showed that the values of the swelling pressure obtained by different test methods are dissimilar. The swelling pressure of bentonite decreased with the increasing pore solution concentration; nevertheless, the effect of temperature on the swelling pressure is still controversial. At the micro-level, crystal layer swelling and double- layer swelling are generally considered to be the main factors affecting the swelling pressure; the pore structure and water distribution of bentonite will change owing to thermo-chemical effects. At the macro-level, involving intergranular stress, a mechanical parameter was proposed to explain the mechanism of the changes in the swelling pressure of bentonite. Finally, future research directions for the study of the evolution of bentonite swelling properties under thermo-chemical effects are proposed, based on the current research results.

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Section: Effect Of Temperature On the Swelling Pressuresupporting

confidence: 86%

“…A similar phenomenon was also indicated by some related studies [5,54]. Nevertheless, other tests also showed that the swelling pressure decreased with the increasing temperature [55][56][57][58].…”

Section: Effect Of Temperature On the Swelling Pressuresupporting

confidence: 85%

Research Progress on the Influence of Thermo-Chemical Effects on the Swelling Pressure of Bentonite

Liu

Yao

et al. 2023

Applied Sciences

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“…벤토 나이트는 스멕타이트 그룹의 몬모릴로나이트가 주요 구 성 광물인 화산쇄설성 퇴적암으로 물과 접촉하게 되면 팽윤되어 부피가 팽창한다(Fig. 2) (Kim et al, 2021). 벤 토나이트의 팽윤능은 몬모릴로나이트의 종류 및 함량에 따라 달라진다.…”

Section: 서 론unclassified

A Literature Review on Studies of Bentonite Alteration by Cement-bentonite Interactions

Goo

Kim

Kwon

et al. 2022

Econ. Environ. Geol.

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Bentonite is being considered as a candidate for buffer material in geological disposal systems for high-level radioactive wastes. In this study, the effect of cement-bentonite interactions on bentonite alteration was investigated by reviewing the literature on studies of cement-bentonite interactions. The major bentonite alteration by hyperalkaline fluids produced by the interaction of cementitious materials with groundwater includes cation exchange, montmorillonite dissolution, secondary mineral precipitation, and illitization. When the hyperalkaline leachate from the reaction of the cementitious material with the groundwater comes into contact with bentonite, montmorillonite, the main component of bentonite, is dissolved and a small amount of secondary minerals such as zeolite, calcium silicate hydrate, and calcite is produced. When montmorillonite is continuously dissolved, the physicochemical properties of bentonite may change, which may ultimately causes changes in bentonite performance as a buffer material such as adsorption capacity, swelling capacity, and hydraulic conductivity. In addition, the bentonite alteration is affected by various factors such as temperature, reaction period, pressure, composition of pore water, bentonite constituent minerals, chemical composition of montmorillonite, and types of interlayer cations. This study can be used as basic information for the long-term stability verification study of the buffer material in the geological disposal system for high-level radioactive wastes.

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Wetting and swelling behaviors of unsaturated compacted Korean Ca-bentonite in contact with a cement-equilibrated fluid

Lee,

Kwon,

2023

Bull Eng Geol Environ

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Thermochemical changes on swelling pressure of compacted bentonite

Cited by 12 publications

References 39 publications

Research Progress on the Influence of Thermo-Chemical Effects on the Swelling Pressure of Bentonite

Research Progress on the Influence of Thermo-Chemical Effects on the Swelling Pressure of Bentonite

A Literature Review on Studies of Bentonite Alteration by Cement-bentonite Interactions

Wetting and swelling behaviors of unsaturated compacted Korean Ca-bentonite in contact with a cement-equilibrated fluid

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