ABSTRACT
This paper focuses on hydro-mechanical behavior (i.e., suction characteristic and swelling pressure) of thermal treated bentonite. Calcium type bentonite (Calcigel) was used in the experimental study. The specimens were heated to temperatures of 100, 200, 300, 400, and 500°C. Change in mineral-logy of specimen was quantified using X-ray diffraction analysis. Chilled-mirror hygrometer technique was used to determine total suction of the pre-heated specimen at room temperature. Swelling pressure was measured applying constant volume swelling pressure method. The results show that the ability of pre-heated specimen to retain water decreases after heating to temperature higher than 100°C due to dehydration and dehydroxylation processes. Pre-heated process does not only influence the value of swelling pressure but also the rate of swelling pressure up built during the test.
