| Issue |
E3S Web of Conf.
Volume 382, 2023
8th International Conference on Unsaturated Soils (UNSAT 2023)
|
|
|---|---|---|
| Article Number | 19002 | |
| Number of page(s) | 5 | |
| Section | Hydro-Mechanical and Thermal Properties of Bentonites and Bentonite-Based Mixtures - Part II | |
| DOI | https://doi.org/10.1051/e3sconf/202338219002 | |
| Published online | 24 April 2023 | |
A parametric study on the hydromechanical properties of claystone/bentonite mixtures
1 EDAFOS Engineering Consultants S.A., 10558 Athens, Greece, formerly: Univ Lyon-INSA Lyon, Euro-Géomat Consulting
2 Univ Lyon, INSA Lyon, 69621 Villeurbanne, France
3 Euro-Géomat Consulting, 45100 Orléans, France
4 Andra, Meuse/Haute-Marne Underground Research Laboratory, 55290 Bure, France
* Corresponding author: dtyri@edafos.gr
Mixtures of crushed excavated COx claystone and bentonite are considered as a potential backfill solution for the French disposal concept of radioactive waste. In the present work, the hydro-mechanical behaviour of claystone/sodium bentonite mixtures was experimentally investigated for various bentonite contents (≤40% in total mass) and densities. Demineralized, site water and cementitious alkaline solution were used. Test on mixtures physicochemical properties showed that Plasticity Index (PI) and Free Swelling Index (FSI) values increase with bentonite content. Introducing bentonite in the mixture induces to lower density for the same compaction energy. No clear impact of the cementitious solution was observed compared to the site water. The expected swelling pressure increase upon bentonite increment was obtained. The effect was more important at higher densities. Mixtures primary wetting, resulted in lower swelling pressure.
© The Authors, published by EDP Sciences, 2023
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