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Microstructural Evolution of Kaolinite Clay under a Thermal Cycle
This study aims to evaluate the impact of a full thermal cycle, freezing–thawing–heating–cooling, on the microstructure of kaolinite clay. The macro-scale behavior of clays under various temperature changes has been investigated extensively, but currently, there is a lack of understanding of the micro-scale response of soils to these thermal loads. In this study, a thermo–hydro–mechanical triaxial cell manufactured by GDS capable of changing the temperature of soil specimens between –20°C and 70°C is utilized. Five different triaxial specimens are mounted on the triaxial setup. Once the saturation is achieved, one specimen is subjected to mechanical consolidation only at 20°C. Each of the four other samples is subjected to temperature changes in a sequence to create a full freezing–thawing–heating–cooling cycle. Once each specimen completes its corresponding thermo-mechanical path, the specimens are swiftly extracted out of the triaxial setup, and samples are taken from the bottom of the triaxial specimen for further microstructural analysis by mercury intrusion porosimetry. The analysis of pore size distribution shows an increase in the modal pore diameter due to freezing, while thawing and heating decrease the dominant pore size. Although there is a slight expansion during the cooling stage, the modal pore size diameter of the specimen decreases at the end of a full cycle.
Microstructural Evolution of Kaolinite Clay under a Thermal Cycle
This study aims to evaluate the impact of a full thermal cycle, freezing–thawing–heating–cooling, on the microstructure of kaolinite clay. The macro-scale behavior of clays under various temperature changes has been investigated extensively, but currently, there is a lack of understanding of the micro-scale response of soils to these thermal loads. In this study, a thermo–hydro–mechanical triaxial cell manufactured by GDS capable of changing the temperature of soil specimens between –20°C and 70°C is utilized. Five different triaxial specimens are mounted on the triaxial setup. Once the saturation is achieved, one specimen is subjected to mechanical consolidation only at 20°C. Each of the four other samples is subjected to temperature changes in a sequence to create a full freezing–thawing–heating–cooling cycle. Once each specimen completes its corresponding thermo-mechanical path, the specimens are swiftly extracted out of the triaxial setup, and samples are taken from the bottom of the triaxial specimen for further microstructural analysis by mercury intrusion porosimetry. The analysis of pore size distribution shows an increase in the modal pore diameter due to freezing, while thawing and heating decrease the dominant pore size. Although there is a slight expansion during the cooling stage, the modal pore size diameter of the specimen decreases at the end of a full cycle.
Microstructural Evolution of Kaolinite Clay under a Thermal Cycle
Zeinali, Seyed Morteza (Autor:in) / Abdelaziz, Sherif L. (Autor:in)
Geo-Congress 2022 ; 2022 ; Charlotte, North Carolina
Geo-Congress 2022 ; 442-452
17.03.2022
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
Microstructural Evolution of Kaolinite Clay under a Thermal Cycle
| British Library Conference Proceedings | 2022
| British Library Conference Proceedings | 1995
Microstructural evolution of expansive clay during drying–wetting cycle
| Springer Verlag | 2020