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Investigation of swelling pressure of bentonite/claystone mixture in the full range of bentonite fraction
Abstract MX80 bentonite/Callovo-Oxfordian (COx) claystone mixture has been proposed as a sealing/backfilling material in a deep geological repository of radioactive waste in France. A good understanding of the swelling behaviour of this mixture is essential when evaluating the long-term performance of the repository. In this work, the swelling pressure of MX80 bentonite/COx claystone mixture was investigated by the constant-volume method for a full range of bentonite fraction. Results show that the swelling of claystone in the mixture can be inhibited by bentonite and its contribution to the global swelling pressure depends on the bentonite fraction. For the mixture with >70% bentonite, claystone behaves as an inert material, and its contribution to the global swelling pressure can be ignored. However, for the mixture with less bentonite, the swelling of claystone will significantly contribute to the global swelling pressure. A method was proposed allowing the swelling pressure of bentonite/claystone mixture to be predicted in the full range of bentonite fraction.
Highlights Claystone's contribution to swelling pressure depends on the bentonite fraction. The effect of bentonite on claystone's swelling can be described by an inhibition factor. A method is proposed to predict the swelling pressure of bentonite/claystone mixture.
Investigation of swelling pressure of bentonite/claystone mixture in the full range of bentonite fraction
Abstract MX80 bentonite/Callovo-Oxfordian (COx) claystone mixture has been proposed as a sealing/backfilling material in a deep geological repository of radioactive waste in France. A good understanding of the swelling behaviour of this mixture is essential when evaluating the long-term performance of the repository. In this work, the swelling pressure of MX80 bentonite/COx claystone mixture was investigated by the constant-volume method for a full range of bentonite fraction. Results show that the swelling of claystone in the mixture can be inhibited by bentonite and its contribution to the global swelling pressure depends on the bentonite fraction. For the mixture with >70% bentonite, claystone behaves as an inert material, and its contribution to the global swelling pressure can be ignored. However, for the mixture with less bentonite, the swelling of claystone will significantly contribute to the global swelling pressure. A method was proposed allowing the swelling pressure of bentonite/claystone mixture to be predicted in the full range of bentonite fraction.
Highlights Claystone's contribution to swelling pressure depends on the bentonite fraction. The effect of bentonite on claystone's swelling can be described by an inhibition factor. A method is proposed to predict the swelling pressure of bentonite/claystone mixture.
Investigation of swelling pressure of bentonite/claystone mixture in the full range of bentonite fraction
Zeng, Zhixiong (author) / Cui, Yu-Jun (author) / Zhang, Feng (author) / Conil, Nathalie (author) / Talandier, Jean (author)
Applied Clay Science ; 178
2019-05-16
Article (Journal)
Electronic Resource
English
Experimental study on the swelling behaviour of bentonite/claystone mixture
| British Library Online Contents | 2012
Experimental study on the swelling behaviour of bentonite/claystone mixture
| Online Contents | 2012