Dehydration Pathways of Gypsum and the Rehydration ... - ACS …
2019年4月26日 · In the high-temperature and low water vapor pressure region, gypsum dehydrates to form γ-CaSO 4 in a single-step process (CaSO 4 ·2H 2 O → γ-CaSO 4); with …
Gypsum - Wikipedia
When gypsum is heated in air it loses water and converts first to calcium sulfate hemihydrate (bassanite, often simply called "plaster") and, if heated further, to anhydrous calcium sulfate …
Understanding gypsum in 3 diagrams - Global Gypsum
2023年5月15日 · The first describes the process of water leaving the structure of gypsum to form hemihydrate or anhydrite. The second depicts the temperature-dependent solubility of the …
1. Ultrasonic results indicate gypsum hydration reaction consists of two stages: the dissolution of hemihydrate in the first stage and the nucleation and precipitation of dihydrate in the second …
Hydration of C3A–gypsum systems - ScienceDirect
2012年7月1日 · Even though it is typically less than 10% of the total composition, its uncontrolled reaction with water can lead to rapid setting, called flash set. Gypsum is added to regulate this …
Mixed transport/reaction control of gypsum dissolution kinetics …
1997年6月15日 · Experiments with gypsum in aqueous solutions at 25°C, low ionic strengths, and a range of saturation states indicate a mixed surface reaction and diffusional transport control …
Gypsum hydration: A theoretical and experimental study
2009年1月1日 · Hardening of mineral binders (cement, gypsum, lime, clay) is accompanied by the dissolution of minerals from the binder surface, their chemical interaction with water (the …
Gypsum board reaction kinetics at elevated temperatures
2012年2月10日 · The chemical kinetics of three main reactions that take place when a gypsum board is exposed at elevated temperatures: evaporation of free moisture content, dehydration …
(PDF) Gypsum solubility in water at 25°C - ResearchGate
2017年2月1日 · According to experimental data (25°C), the solubility of gypsum particles in water is inversely proportional to their size at r < 1 μm and is r-invariant for larger grains. The …
Dissolution and conversions of gypsum and anhydrite
2000年4月1日 · The effect of water in gypsum-based materials promotes cracking and loss of the finishing plaster material (C3), which allowed the inner layer (thermal plaster) becoming visible.