The industrial byproduct gypsum is a general term for byproducts discharged from industrial production with calcium sulfate as the main ingredient. Due to the high number of impurities and production volume, the industrial byproduct gypsum is underutilized, leading to serious environmental problems. At present, only desulfurization gypsum and phosphogypsum …

Gypsum prevents Flash Setting of cement during manufacturing. It retards the setting time of cement. Allows a longer working time for mixing, transporting and placing.

The hydration process of solid-waste belite sulphoaluminate cement regulated by desulfurization gypsum was studied. ... The role of desulfurization gypsum in BSAC hydration remains to be further studied. (1) ... Future research should further investigate the effects of desulfurized gypsum on the different properties of BSAC, such as tensile ...

The results show that adding desulfurized gypsum, which accounts for 6% to 8% of the total mass of the cementitious material, has no adverse effect on the workability and can …

2. When desulfurization gypsum is used as a cement retarder to prepare cement, the cement has a larger specific surface area than the natural gypsum during the same grinding time. The grindability of desulfurized gypsum is better than natural gypsum, and the desulfurized gypsum itself is a fine powdery material.

An innovative approach suggests using titanium slag and flue gas desulfurized gypsum as substitutes for Portland cement for soil solidification. This study systematically evaluates the effects of titanium slag-flue gas desulfurized gypsum-Portland cement composite (TS-FGD-OPC composite) solidifier on the performance of solidified soils.

Role of gypsum in cement. Cement is a binding material used in the construction of concrete structures. Cement plays a vital role in terms of economy and the durability of the structure. So, cement should maintain quality enough while mixing the ingredient of concrete i.e sand, aggregate, and admixture. ...

Concrete/cement and asphalt production. Natural gypsum can be used in concrete production as a replacement for calcium aluminate cement (CAC), opening the possibility of replacing the natural gypsum with FGDG in this application with success, even though some studies have reported a reduction of compressive strength and water solubility when ...

In this paper, coal gangue, carbide slag and desulfurized gypsum (DG) were used as raw materials to calcine the all-solid-waste-based belite sulphoaluminate cement (BSAC), and the hydration and hardening process of BSAC with different DG content was studied.

It also reviews the various applications of FGD gypsum, such as in cement and concrete production, agriculture, and gypsum board manufacturing. In the construction industry, FGD gypsum is widely used as a raw material for producing gypsum products, such as plasterboard and cement, due to its high purity and low cost.

Flue gas desulfurized gypsum (FGD gypsum), mainly originates from thermal power plants, smelters, and large-scale enterprise boilers. This article reviews the production in China and the latest ...

Tens of millions of tons of desulfurized gypsum can be produced in China every year. Desulfurization gypsum is used as an admixture to replace part of cement in concrete. And the smaller the particle size of desulfurized gypsum, the better the mechanical properties of cement mortar. The compressive and flexural tests show that the cement mortar with 3% and 4% …

ROLE OF GYPSUM IN CEMENT In the absence of gypsum, the reaction of C 3 A in ground clinker (cement) with water is very rapid. The C 3 ... Common forms of sulphates present in cement Gypsum Hemihydrate Soluble Anhydrite* (Plasters) Anhydrite heat CaSO4.2H2O CaSO 4.½ H2O CaSO4 CaSO 4 120-176 OC 220 - 260 OC > 648 OC

The obtained semi-aqueous desulfurized gypsum was the original desulfurized gypsum, which was placed in an oven at 180 °C and dehydrated for 2 h under synchronous heating with the box. The microscopic morphology of desulfurization gypsum from SEM and XRD analysis is shown in Fig. 1. The original desulfurization gypsum featured rhombic blocks ...

In order to explore the influence of the types of waste gypsum on the properties of alkali slag cement, fluorogypsum (FG) and flue-gas desulfurization (FGD) gypsum were comparatively investigated. Moreover, the action mechanisms of FG and FGD gypsum on the properties of alkali slag cement were analyzed. The results show that both the FG and FGD …

From the experiment, it was found that the highest compressive strength of concrete brick specimens was 45.18 MPa, which was produced from 5.5% gypsum without CDW and OPT, while 26.84 MPa was the ...

Lv et al. investigated the influence of desulfurized gypsum (DG) on the rheological properties and expansion rate of ordinary Portland cement (OPC). The study revealed that the impact of DG …

3.1.1. Desulfurized Gypsum. The performance parameters of the BPG-based cementitious materials involved in the third part are shown in Table 3. Lv et al. [73] investigated the influence of desulfurized gypsum (DG) on the rheological properties and expansion rate of …

FEATURE Gypsum The role of gypsum in cement Shreesh Khadilkar reviews the present situation of gypsum, and takes us through a variety of gypsum products, its merits and demerits. G ypsum (CaSO4.2H2O) is used widely in various industries either as gypsum, i.e., the gypsum di-hydrate crystalline variety or as the gypsum hemi hydrates, also known ...

Thus, utilizing gypsum-based self-leveling mortar (GSLM) stands out as a promising and effective approach to address the issue. β-hemihydrate gypsum, cement, …

The influences of desulfurization gypsum on the properties of both Magnesium oxychloride cement (MOC) pastes and MOC abrasive tools were investigated in this study.

This work aims to investigate the effect of additional flue gas desulfurization gypsum (FGDG) on the properties of calcium sulfoaluminate cement (CSAC) blended with ground granulated blast furnace slag (GGBFS). The hydration rate, setting time, mechanical strength, pore structure and hydration products of the CSAC-GGBFS mixture containing FGDG were …

The mixture then sent to final grinding process. For ordinary Portland cement it remains between 3 to 4% and in case of Quick setting cement it can be reduced up to 2.5%. Role of Gypsum in Cement 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 weighed fly ash, desulfurized gypsum, cement and silt are poured into the mixer for dry mixing for about 1 min. Next, pour half of the weighed water and stir for 30 s, followed by adding the remaining water and mixing for about 3 min to create a desulfurization gypsum–fly ash fluidized lightweight soil slurry. Pour the slurry into a test ...

Gypsum plays an essential role in the manufacturing of cement. It contributes to the strengthening, workability, setting time, and durability of the cement. The careful use of gypsum in cement production leads to enhanced performance, improved longevity, and advanced construction practices, making it an essential component in the construction ...

This article aims to explore the effect of cellulose ether on the hydration heat of desulfurized gypsum and its role in. ... It is commonly used in construction as a binder in cement and concrete production. However, the hydration process of desulfurized gypsum can generate a significant amount of heat, which can lead to cracking and other ...

The utilization of desulfurized building gypsum as raw material for gypsum-based self-leveling mortar (GSL) is limited by its low strength and poor water resistance.

Thermal treatment and utilization of flue gas desulphurization gypsum as an admixture in cement and concrete. Construct. Build. Mater., 22 ... Preparation, characterization and application of red mud, fly ash and desulfurized gypsum based eco-friendly road base materials. Clean. ... Role of slag in microstructural development and hardening of ...

In this blog, we will explore the role of gypsum in cement and its effects on the final product. Understanding Gypsum. Gypsum, chemically known as calcium sulfate dihydrate (CaSO4 · 2H2O), is a naturally occurring mineral widely available worldwide. It consists of hydrated calcium sulfate crystals and contains water molecules within its structure.

The above research shows that the application of desulfurized gypsum in concrete systems will help improve the overall performance of concrete, realize the industrial utilization of desulfurized gypsum, and turn desulfurized gypsum into treasure, which is in line with the green and low-carbon development concept. However, adding FGD gypsum