Gypsum Hydration Process

Dehydration Pathways of Gypsum and the Rehydration …

Their experimental results reveal that gypsum dehydration proceeds through only a single CaSO 4 ·2H 2 O → γ-CaSO 4 step when the ambient water vapor pressure is less than 26664 Pa; …

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Study on retarding feature and retardation mechanism of …

To improve the retarding performance and understand the retardation mechanism of gypsum retarders, more and more investigations have focused on the effect of various …

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Effect of Low pH on Forming Process of Desulfurization Gypsum …

The hydration product of gypsum adheres tightly to glass fiber surface and produces a good cross-linking and binding effect with MF. The flexural strength, compressive …

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Study on early hydration of gypsum-based materials

The hydration process of pure gypsum paste revealed by a cumulation heat curve, b heat flow curve and c time evolution of storage modulus, respectively. The two dashed line …

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Gypsum hydration: a theoretical and experimental study

The present paper addresses the gypsum hydration study with the theoretical and experimental method. The microstructure of gypsum changes during the hydration reaction. The hydration …

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Influence of calcination temperature on hydration behavior, …

Detailed hydration and textural studies allowed the identification of the underlying mechanisms leading to differences in plaster performance related to (i) delayed hydration of …

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The effect of gypsum on the hydration of alite–belite–ferrite phase

The hydration degree at different ages is calculated to evaluate the influence of gypsum on hydration process. Materials and methods. The alite–belite–ferrite phase system …

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Effect of protein peptides with different molecular weights on …

The hydration process of gypsum hemihydrate refers to its reaction with water to form gypsum dihydrate. The characteristics of gypsum dihydrate as the hydration product were …

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Dissolution and conversions of gypsum and anhydrite

Calcium sulfate occurs in nature mainly in form of three different minerals distinguished by their degree of hydration: gypsum (CaSO 4 ), bassanite (CaSO 4 ⋅0.5H 2 O) …

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[PDF] Microstructure and mechanical properties of β …

DOI: 10.1016/J.CONBUILDMAT.2010.12.005 Corpus ID: 136787812; Microstructure and mechanical properties of β-hemihydrate produced gypsum: an insight from its hydration …

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Hydration and mechanical properties of FGD gypsum

After the beginning of hydration, gypsum dissolved quickly and a dihydrate gypsum formed. Fig. 11 (a) displays the main peak of the sample came from the dihydrate gypsum …

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Dissolution and conversions of gypsum and …

Gypsum dissolves by a simple two-phase dissociation. Anhydrite, when dissolved, forms a solution of calcium sulfate, which at common temperatures and pressures is in equilibrium with the...

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Hydration of C3A–gypsum systems

Hydration of C 3 A–gypsum systems with different gypsum additions was investigated in terms of the phase assemblage, kinetics and microstructural development. The …

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Dehydration Pathways of Gypsum and the …

In this work, the dehydration pathways of gypsum and the rehydration mechanism of soluble anhydrite were mainly investigated by …

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Uses of Gypsum in Cement

Hydration Process: Rate of hardening: During the final grinding process of the cement, gypsum is added. This should only be done once the clinker has cooled down during …

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Hydration characteristics and mechanism analysis of β …

Lanzon [13] studied the hydration process of gypsum building plasters with different concentrations of citric acid by attenuated total reflectance infrared spectroscopy, …

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Experimental Study on Physical and Mechanical Properties of Gypsum …

The hydration process of gypsum rock was accelerated due to the weak sedimentary surface and the swelling and cracking of filling minerals, but the macroscopic …

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Impact of nanosilica on tricalcium aluminate hydration and …

Findings suggest that NS inhibits the formation of ettringite during the C 3 A–gypsum hydration process, but does not exert a notable influence on the final hydration …

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Gypsum

Hydration [%] Optimization of the gypsum hydration process amino acid A 0.006 % amino acid A 0.012 % protein hydrolysate A 0.006 % protein hydrolysate A 0.012 % Retardan®-200L 0.006 …

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Hydration process: Kinetics and thermodynamics

The hydration process could be divided into five stages; the first four stages cover early age hydration development and extend over few days, and the fifth stage extends over …

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Formation of α-Hemihydrate Inside of a …

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 technical reasons, are mixed with water to …

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Microstructure and mechanical properties of β-hemihydrate …

This article addresses the microstructure and related mechanical properties of gypsum produced from β-hemihydrate using information of its hydration process, from fresh …

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Desulfurized gypsum regulates the hydration and hardening process …

Although desulfurization gypsum, gypsum and anhydrite are all mineral phases containing CaSO 4, their effects on the hydration process of sulphoaluminate cement are different due to their …

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Effect of graphene oxide on hydration and performance of …

Due to the rapid hydration of gypsum and exothermic relatively concentrated, the hydration temperature rise curve can be tested to analyze its hydration process [22]. First, …

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Comparative Analysis of Hydration Expansion Performance …

Gypsum has micro-expansion characteristic during the process of hydration and solidification, and there are certain differences in the hydration expansion characteristics of …

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Improving the early-age properties of eco-binder with high …

It is proposed in the previous studies that the weight loss peak between 120 °C and 160 °C primarily correlates with the dehydration of the gypsum phase (Tang et al., 2024; …

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Experimental Study on the Properties and …

According to the hydration products and micro-morphological analysis in Section 3.5 and Section 3.6, the hydration reaction process of gypsum-based composite cementitious materials was elucidated, as shown …

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Hydration analysis of phosphogypsum cementitious …

Some segments of the phosphorus building gypsum hydration process experience delay or cessation, while certain constituents of cement are densely packed, forming a …

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New insight into the phase changes of gypsum

Partial dehydration to anhydrite II (insoluble) takes place already at temperatures below 90 °C before the formation of soluble anhydrite III. Dehydration below 90 °C occurs in …

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Gypsum hydration: a theoretical and experimental study

Calcium sulphate dihydrate (CaSO4·2H2O or gypsum) is used widely as building material because of its excellent fire resistance, aesthetics, and low price. Hemihydrate occurs …

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Effects of several retarders on setting time and strength of …

The results showed that pH and temperature had a great influence on retardation. Huang Yuyan et al. [9] found that black tea alters the gypsum hydration process, decreases …

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Role of Gypsum in Cement and its Effects – …

The main purpose of adding gypsum in the cement is to slow down the hydration process of cement once it is mixed with water. The process involved in hydration of cement is that, when …

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The Influences of Soluble Phosphorus on Hydration Process …

For example, calcium phosphate from the hydration of soluble phosphorus can be absorbed on the surface of hemihydrate gypsum crystal which delays its hydration process …

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The effect of gypsum on the hydration of alite–belite

Thus, the investigation of gypsum on the hydration process of single-phase or multi-phase system is one of the key issues. The objective of the current research is to investigate the effect of …

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(PDF) Dehydration Pathways of Gypsum and the …

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 ...

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Understanding gypsum in 3 diagrams

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 …

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Effect of gypsum on hydration properties, composition and …

The calorimetry method can reflect the hydration process of the pastes by measuring the heat and heat generation rate. Based on the hydration heat curve, ... Fig. 11 …

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The Influences of Soluble Phosphorus on Hydration …

particle size of the dihydrate gypsum [12]. During the hydration process, SO4 2 can be replaced by HPO4 2 into gypsum crystals to form a solid solution, which further affects the gypsum ...

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