Effect of Thermal Volume Change on the Permeability of Kaolin Clay during a Heating-Cooling Cycle
Publication: Geo-Congress 2023
ABSTRACT
Thermal loading changes the hydraulic conductivity of the soil medium. This research aims to study the effect of a heating-cooling cycle on the permeability of Kaolin clay. A temperature-controlled triaxial permeameter cell is used in this study to explore the variations of soil permeability at 20°C, 50°C, and 80°C. The hydraulic conductivity at each temperature is measured after 48 h at each temperature during the heating-cooling cycle to make sure the volume change due to thermal loading is stabilized. Evaluation of void ratio change during heating and cooling has been observed to predict the thermal behavior of Kaolin clay. It is observed that the intrinsic permeability during the cooling cycle is 9%–12% lower than the permeability observed during the heating cycle. The obtained results suggest that Kaolin clay’s microstructure can change subject to a heating-cooling process, which creates irrecoverable deformation in the clay and regulates the macro behavior such as permeability of Kaolin clay.
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Geo-Congress 2023
Pages: 341 - 350
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Published online: Mar 23, 2023
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