Deterioration of the bentonite sand mixture material due to thermal hydro chemical activity

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4. Deterioration of the bentonite sand mixture material due to thermal hydro chemical activity

This testing program has prepared a constant volume swelling system that can correspond to both distilled water and salinity water. The stainless-steel mold is highly resistant to chemical corrosion and holds specimens of compacted bentonite sand mixtures. Some salinity water have concentration variations of 1.2 %, 3.5 %, 6.0 %, and 8.0 %. The bentonite sand mixture sample in the steal mold is immersed in the solution. This process produces a chemical reaction that focuses on montmorillonite as one of many minerals in bentonite. Moreover, to expand the investigation of the chemical reaction, carbon dioxide pressure is applied to the unsaturated and saturated specimens. This study investigates the thermal and chemical processes including salinity effort and carbon dioxide . These two derived from population are serious problems in geotechnical environmental engineering.

       In this study, the unconfined compressive strength subjected to THC performances was measured. All data presented obvious soft alternation of the aforementioned effects. The measured unconfined compressive strength for unsaturated and saturated soils according to the process of these THC factors expresses shear resistance reduction. The soil subjected to salinity and heating effort further reduced the shear resistance through THC coupling. It can produce soft soils with regard to the assessment of chemical and thermal impacts. 

International Conference on Advances and Innovations in Soft Soil Engineering (ICAISSE2026)

Multiphysics Behaviour