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Valorisation de l'argilite du Callovo-Oxfordien sous forme de liant alcalinement activé dans le but de développer un coulis injectable

Abstract : In the context of Cigéo project (geological industrial disposal for radioactive wastes), this work focuses on the valorization of Callovo-Oxfordian argillite by the formulation of an alkali-activated grout. This application required a high setting time (close to 24 hours) and a moderate pH value (10-11). Thus, the argillite thermal treatment has been adapted to alter clays minerals without decomposing carbonate species (to avoid the presence of reactive calcium). A potassium-based silicate solution, with moderated reactivity (Si/K = 0.70), has been used for the alkali-activation step. Concerning the grout formulation, it has been necessary to enhance the argillite reactivity by the insertion of metakaolin and to add boron-based compounds. The resulting grout was in accordance with the specification. Finally, a study of the binder in an environment close to the using conditions (injection between geological layer and a radioactive waste lining) has been investigated. In this aim, the binder has been casted in contact with the geological argillite at 90 °C. It was evidenced a network reorganization at 90 °C (boron integration in the network and possible formation of zeolite). Potassium diffusion from the binder to the argillite has also been observed.
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https://tel.archives-ouvertes.fr/tel-02418688
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Submitted on : Thursday, December 19, 2019 - 10:50:31 AM
Last modification on : Tuesday, March 17, 2020 - 3:12:32 AM

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  • HAL Id : tel-02418688, version 2

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Colin Dupuy. Valorisation de l'argilite du Callovo-Oxfordien sous forme de liant alcalinement activé dans le but de développer un coulis injectable. Matériaux. Université de Limoges, 2019. Français. ⟨NNT : 2019LIMO0075⟩. ⟨tel-02418688v2⟩

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