Vapour Multicycle Sorption of a Cement–Bentonite Cutoff Wall Material: Hysteresis Effects

This paper examines the effects of multicycles desorption/adsorption on water isotherms a typical cement–bentonite mixture. These were evaluated over relative humidity (RH) range 90% and 0.3%. study shows that, after first adsorption–desorption cycle, subsequent cycle shifted isotherm curves upward, particularly at RH < 70%, with high degree hysteresis. In contrast, > slightly downward low The overall hysteresis decreased cycles. It is postulated that multi-adsorption–desorption cycles led to microstructural changes in CB porous system as material’s retention ability was enhanced by increasing