Vapour multicycle sorption of a cement–bentonite cutoff wall material: Hysteresis Effects

Sarah Al-Baiaty, Abdelmalek Bouazza

Research output: Contribution to journalArticleResearchpeer-review


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

Original languageEnglish
Article number2469
Number of pages10
JournalWater (Switzerland)
Issue number13
Publication statusPublished - 5 Jul 2023


  • adsorption–desorption cycles
  • cement–bentonite
  • cut-off wall
  • hysteresis
  • unsaturated

Cite this