INDEX

Dehydration Pathways of Gypsum and the

2019.4.26  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 increasing water vapor pressure, gypsum undergoes the

Dehydration Pathways of Gypsum and the Rehydration

2023.10.27  In the high-temperature and low water vapor pressure region, gypsum dehydrates to form γ-CaSO4 in a single-step process (CaSO42H2O γ -CaSO4); with

The thermal dehydration of natural gypsum and pure calcium sulphate ...

1996.7.10  From X-ray diffraction analysis, it appears, that the decomposition reaction of both the natural gypsum and pure calcium sulphate dihydrate proceeds via the hemihydrate

(PDF) Dehydration Pathways of Gypsum and the

2019.4.30  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 increasing water vapor pressure,...

The dehydration process of gypsum under high pressure

2017.8.29  gypsum-anhydrite dehydration reaction sequences at simultaneous high-pressure and temperature conditions. Mirwald (2008) performed a study of CaSO 4 H 2O

Gypsum hydration: a theoretical and experimental study

2024.5.25  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

The dehydration process of gypsum under high pressure

2011.9.30  Mirwald (2008) performed a study of CaSO 4 H 2 O system by differential pressure analysis (DPA), following the dehydration process up to 623 K and 3.5 GPa and

Dehydration Pathways of Gypsum and the Rehydration Mechanism

2019.4.26  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

DEHYDRATION OF GYPSUM - TRID - Transport Research

DEHYDRATION OF GYPSUM. Studies of the dehydration of gypsum in dry air atmospheres have shown that the hemihydrate of calcium sulfate is not a stable phase in the temperature range

Structural evolution of gypsum (CaSO42H2O) during

Two–step process in the dehydration of gypsum Supplementary Figure S1 (Fig. S1–S4 are available on-line from doi/10.2465/jmps.220811) shows the TG and DTA curves of

Formation of α-Hemihydrate Inside of a Gypsum

2022.12.8  This work firstly shows that the observed crystallization inside of gypsum during dehydration is the formation of alpha-hemihydrate. Gypsum crystal at (a) 135 • C, and (b) 142 • C. Crystals ...

Structural evolution during the dehydration of

2009.6.1  The dehydration of pure and waste gypsums has been examined using in situ synchrotron angle-dispersive X-ray diffraction. Pure gypsum was studied under a number of defined environments; various ...

Kinetics of Gypsum Dehydration - Springer

2017.8.25  port some problems concerning non-isothermal kinetic of the dehydration. Thermal analysis curves corresponding to dehydration of a 81 mg sample in a platinum

Gypsum Properties, Formation, Uses and Deposits

2023.9.9  Complete Dehydration: If gypsum is heated to higher temperatures and for an extended period, it loses all its water content, transforming into anhydrous calcium sulfate

From atom level to macroscopic scale: Structural mechanism of gypsum ...

2022.4.1  Gypsum plaster is an inorganic binder that is prepared in a two-step process. The first step is dehydration: heated to 100–200 °C, gypsum (CaSO 4 2H 2 O) releases water as

The thermal dehydration of synthetic gypsum - ScienceDirect

1995.12.20  Mass losses vary between 13.7 and 16.5% and heat of dehydration values between 377 and 420 J g −1 for the dehydration of ground and mixed inhomogeneous gypsum

The dehydration process of gypsum under high pressure

2011.9.30  The effects of pressure on the dehydration of gypsum materials were investigated up to 633 K and 25 GPa by using Raman spectroscopy and synchrotron X-ray

Formation of alpha;-Hemihydrate Inside of a Gypsum

2022.12.8  Gypsum (calcium sulfate dihydrate) is one of the most used inorganic binding materials in the world. During calcination, calcium sulfate subhydrates are formed and, for

Experimental Study on the Properties and Hydration Mechanism of Gypsum ...

2024.1.23  In order to achieve the resourceful, large-scale and high-value utilization of bulk industrial solid wastes such as flue gas desulfurization gypsum (FGDG), fly ash (FA) and

Dehydration Pathways of Gypsum and the Rehydration

2023.10.27  Dehydration Pathways of Gypsum and the Rehydration Mechanism of Soluble Anhydrite γ‑CaSO 4 Yongbo Tang, † Jianming Gao,* ,†,‡ Chuanbei Liu, † Xuemei Chen, †

Dehydration‐induced damage and deformation in gypsum

2012.3.10  [56] We performed drained dehydration tests on Volterra gypsum in hydrostatic and creep conditions, while monitoring AEs and elastic wave velocities. The dehydration

cheCimentl equation dehydration of gypsum - itjablonska

(PDF) Dissolution and conversions of gypsum

2000.4.1  The plot of the solubility product values against pressure and temperature according to Eqs. 2 to 4, for both gypsum and anhydrite, is shown in Fig. 5.

The dehydration kinetics of gypsum at high pressure and

2023.9.24  An in situ dehydration kinetics study of gypsum under water-saturated condition was performed in the temperature and pressure ranges of 383–423 K and 343–1085 MPa by

Dehydration behavior of FGD gypsum by simultaneous TG ...

2010.10.26  The dehydration of gypsum proceeded through one step, i.e., CaSO 4 2H 2 O → γ-CaSO 4 (γ-anhydrite) ... with two ‘model-free’ kinetic methods and those of isothermal

Fast in-situ X-ray scattering reveals stress sensitivity of gypsum ...

2021.5.24  The dehydration of gypsum to hemihydrate has been studied for decades because it is an important model reaction for understanding fluid-triggered earthquakes, and

Insights Into the Micromechanics of Dehydration‐Induced Gypsum

2024.1.3  The dehydration path gypsum–bassanite–anhydrite III was shown to have strong parallels to a physical drying process, which depends on many parameters beyond the burning

Dehydration reactions of gypsum: A neutron and X-ray

1990.3.1  The kinetics of the dehydration of gypsum was investigated by powder diffraction methods. Using the incoherent scattering effect of H with the neutron beam, the background

Dehydration of Gypsum Under Dry CO2 Injection

2013.1.1  There is a strong effect of the CO2 that facilitates anhydrous gypsum dehydration which then occurs at room temperature, lower than the transition temperature of gypsum

Novel approach to thermal degradation kinetics of gypsum: application ...

2019.10.14  Gypsum of chemical formula CaSO 4 2H 2 O, also called calcium sulfate dihydrate, is a versatile material used in several sectors of activity such as cement industry,