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New insights into the effect of gypsum on hydration and …
The influence of gypsum on hydration and microstructure of fresh C 3 S paste during setting were studied with isothermal calorimetry, 1 H nuclear magnetic resonance (1 H …
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Effect of desulfurization gypsum on alternating-current …
It was demonstrated that the desulfurization gypsum slows down the hydration rate of BSAC mortar in the early stage, prolongs the hydration period, and improves the …
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Effect of Gypsum on Hydration and …
The effects of different dosages of gypsum on the hydration and hardening properties of AMCSA, such as setting time, hydration rate, compressive strength and hydration …
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Effect of gypsum on hydration properties, composition and …
In this study, a new low-carbon clinker, belite-ye'elimite-Q phase-ferrite (BYQF), was produced and hydrated with and without gypsum at 8 %, 15 % and 30 % mass concentrations. …
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Dehydration Pathways of Gypsum and …
The dehydration products of gypsum under different temperature and water vapor pressure were investigated by thermodynamic theory. Additionally, the rehydration …
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Steering the early strength of clinker-free cementitious …
A series of characterization techniques revealed that the early strength agents expedited the formation rate of hydration products (ettringite and calcium aluminium silicate …
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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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Moisture in Gypsum Panel Products
The number of inquiries to the Gypsum Association about water-damaged gypsum panels always increases during the winter, early spring, after hurricane season or after any …
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The role of sulfate ions in tricalcium aluminate hydration: New
The morphology of hydration products of C 3 A-5% Gypsum (by mass) (a) 1 h of hydration, right before adding Ba(NO 3) 2, marked as P1, (b) 6 min after adding Ba(NO 3) 2, …
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Effect of ground granulated blast-furnace slag slurries by …
A microcalorimeter (TAM AIR, C80) was employed to evaluate the exothermic hydration process of gypsum and quantitatively assess the rate and total amount of …
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Thermal and hydration properties of 3D gypsum …
The exothermic rate and hydration rate of gypsum hydration were accelerated with the accelerators added. The maximum exothermic peak appeared in the order of LS (6.78 …
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Effect of Gypsum on Hydration and Hardening Properties of …
The effects of different dosages of gypsum on the hydration and hardening properties of AMCSA, such as setting time, hydration rate, compressive strength and hydration …
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Properties and hydration mechanism of slow-setting and …
In the early stage of cement hydration, the main minerals C 3 S and C 3 A react rapidly to form C-S-H gel, CH, and AFt. The hydration rate of C 2 S is slower, while the …
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(1) 2, 3
Set Gypsum Plaster VARIATIONS within normal range of temperature ... tures the rate of hydration does drop considerably•. Results similar to those shown in Fig. 1 were obtained
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Evaluation of properties of gypsum plaster-superplasticizer …
However, the results show some differences in the hydration rate of gypsum plaster due to the incorporation of superplasticizer which are indicated by an increase in the intensity …
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The Influence of Gypsum Content on the …
tent of gypsum (up to 30 wt.%) enhanced the hydration rate of ye'elimite and promoted the formation of higher amounts of ettringite, resulting in high early-age strengths [ 13 ].
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Gypsum in Cement
Thus, the hydration of C3S is slowed down when that of C3A is not adequately delayed by gypsum. The lower hydration rate of C3S is attributed to the large consumption of …
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Ultrasonic results indicate gypsum hydration reaction consists of two stages: the dissolution of hemihydrate in the first st age and the nucleation and precipitation
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(PDF) The effect of gypsum on the hydration of …
gypsum mainly promotes the hydration rate of alite at early. age, which is in good agreement with Ref. [5, 6, 9]. The. XRD results also confirm that the hydration rate of alite is.
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Effect of Gypsum on the Hydration and Strength of C3S …
More specifically, gypsum mainly promotes the hydration rate of alite at early age, which is in good agreement with Ref. [5, 6,9]. The XRD results also confirm that the hydration …
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Early C3A hydration in the presence of different kinds of …
Hydration reactions of C 3 A with various amounts of calcium sulfate hemihydrate, gypsum or a mixture of the two, were investigated by isothermal microcalorimetry, and a …
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Effect of Gypsum on the Early Hydration of Cubic and Na …
To consolidate the understanding of the effects that gypsum has on the hydration of cub- and orth-C 3 A, this paper presents an integrated in situ assessment of the chemistry of the (cub- …
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Performance regulation of desulfurized gypsum on solid …
These gypsum particles dissolve rapidly into sulfate compounds upon contact with water, enhancing sulfate erosion of the matrix and reducing its corrosion resistance. ... By comparing …
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Calcium sulphate hemihydrate hydration leading to gypsum
Once gypsum is present, the rate of the hydration can be slowed down but the process cannot be stopped. The only way that PANa can prevent hemihydrate hydration is by …
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A quantitative study of the C3A hydration
The reaction of C 3 A in the presence of gypsum can be divided into three stages, as depicted in Fig. 1 by the rate of heat evolution as function of hydration time. Stage 1 …
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Hydration and mechanical properties of FGD gypsum
In Fig. 10 (b), compared with the sample M 1, the hydration rate ternary system was larger than the gypsum-cement and gypsum-mineral powder binary systems. This …
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Hydration reaction and microstructural characteristics of hemihydrate
What's more, gypsum-based materials can be recycled endless, because the hydration product of gypsum plaster is also its raw material [13]. Therefore, gypsum-based …
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Cementation characteristics and hydration mechanism of …
This indicates that the addition of gypsum greatly reduced the early hydration reaction rate and that and the strength of PG-containing backfill reduced more. From Fig. 5 …
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Effect of Water–Solid Mixing Sequence and Crystallization …
3.1. Effect of Mixing on the Hydration of C 3 A-Gypsum Systems. Figure 1 shows the rate of heat release and cumulative heat measured by isothermal calorimetry for the fine …
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Experimental Study on Physical and Mechanical Properties of Gypsum …
In order to study the physical and mechanical properties of gypsum rock samples in three states (natural, high-temperature dehydration and hydration time), natural gypsum rock …
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The effect of gypsum on the hydration of alite–belite–ferrite phase
XRD analysis results show that the gypsum mainly promotes the hydration rate of alite at early age and the hydration rate of alite is faster than ferrite phase. 4. Among the 4 …
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Hydration of quaternary phase-gypsum system
In conclusion, the chemical composition of hydration products depends on the gypsum contents. The hydration of Q phase-gypsum system is controlled by formation of AFt …
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Nondestructive Evaluation for Hydration and Setting Time of …
The 5% addition of gypsum in CSA cement paste enhanced the hydration evolution, such as ettringite, and it can induce the faster setting time up to 6 h and strength …
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Shrinkage, hydration, and strength development of limestone calcined
It is known that gypsum retards the hydration of the aluminate (C 3 A) phase in the clinker [46, 47], attributed to the adsorption of sulfate ions on the C 3 A surface [9]. When …
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New insights into the effect of gypsum on hydration and …
The addition of gypsum decelerates the hydration rate of C 3 S throughout the whole setting period and prolongs the induction period. This behavior lies in the fact that the …
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The effect of gypsum on the hydration of alite–belite–ferrite …
XRD analysis results show that the gypsum mainly promotes the hydration rate of alite at early age and the hydration rate of alite is faster than ferrite phase. Moreover, no …
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(PDF) Comparative Analysis of Hydration Expansion …
In this paper, by analysing the gypsum crystal morphology, particle size distribution, hydration heat, dimensional change rate, and morphology change of hydration products in the …
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Effect of gypsum on hydration properties, composition and …
C 4 AF: The effect of gypsum on the dissolution rate and hydration degree of C 4 AF is comparable to that of C 2 S, with excess gypsum reducing the dissolution rate. The ferrite …
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Hydration Characteristics of Tricalcium …
The hydration rate can be further reduced with increasing nano-SiO 2 content, but the significance is not obvious. ... Hou et al. explored the influence of nano-SiO 2 on the hydration process of C 3 A-gypsum and C 3 A-C 3 S-gypsum systems, …
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The effect of gypsum on the hydration of alite–belite
XRD analysis results show that the gypsum mainly promotes the hydration rate of alite at early age and the hydration rate of alite is faster than ferrite phase. Moreover, no observable …
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