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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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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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Limestone particle sizes and sulfate impact on the early hydration …

An analysis of the equations above reveals that to determine the hydration rates for each stage, it is imperative to acquire both the degree of hydration (α) and the rate of …

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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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(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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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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Thermal and hydration properties of 3D printing 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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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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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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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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Dissolution and conversions of gypsum and …

Rates of gypsum dissolution are very high in the region far from saturation, but they decrease abruptly when the solution approaches high saturation levels. Because of transport-controlled...

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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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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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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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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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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 …