Dehydration Pathways of Gypsum and the Rehydration Mechanism of Soluble Anhydrite γ-CaSO₄.

ABSTRACT: The dehydration products of gypsum under different temperature and water vapor pressure were investigated by thermodynamic theory. Additionally, the rehydration mechanism of soluble anhydrite was also studied by Monte Carlo (MC) simulations. The thermodynamic calculation results reveal that the dehydration mechanism of gypsum significantly depended on ambient temperature and water vapor pressure. In the high-temperature and low water vapor pressure region, gypsum dehydrates to form γ-CaSO₄ in a single-step process (CaSO₄·2H₂O → γ-CaSO₄); with increasing water vapor pressure, gypsum undergoes the CaSO₄·2H₂O → γ-CaSO₄ → β-CaSO₄·0.5H₂O reaction path and as water vapor pressure increases further,

SUBMITTER: Tang Y 

PROVIDER: S-EPMC6649257 | biostudies-literature | 2019 Apr

REPOSITORIES: biostudies-literature