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Bibliometric study of the application of gypsum residues and by-products in Portland cement and mortar

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Summary: Supersulfated cement (SSC), a low pH value cement, is a potential alternative to Portland cement for solidifying nuclear waste. Phosphogypsum (PG), an industrial waste, was pretreated by calcination and lime neutralization before being used to prepare SSC. The corrosion of aluminium rods by PG-based SSC is lower than that of Portland cement, especially for calcined PG-based SSC. The immobilization mechanism of SSCs on nuclear waste involves the dissolution of a protective alumina layer, the formation of hydrogen and Al(OH)3, and the slowing of corrosion reaction by ettringite and Al(OH)3 formation.

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Effect of Ball Milling Time on the Performance of Phosphorous Building Gypsum

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Summary: In this study, phosphogypsum was ball-milled to obtain phosphorus building gypsum (PBG) that meets the Chinese standards for first-class building gypsum. The ball milling process significantly reduced the water requirement and improved the setting time and strength of phosphogypsum. Compared to other treatment methods, ball milling has the advantages of simplicity, environmental protection, and low cost, making it practically significant in production.

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Khalil Naciri et al.

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The impact of carbonation at different CO2 concentrations on the microstructure of phosphogypsum-based supersulfated cement paste

Yifan Xie et al.

Summary: This study investigates the effects of carbonation on the microstructure of phosphogypsum-based supersulfated cement paste at different CO2 concentrations. The results show that carbonation significantly increases the porosity and pore size of the paste, leading to changes in the main hydration products and formation of carbonation products.

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Mechanical strength, water resistance and drying shrinkage of lightweight hemihydrate phosphogypsum-cement composite with ground granulated blast furnace slag and recycled waste glass

Longjian Zhang et al.

Summary: This study developed a composite material for building applications using phosphogypsum and recycled waste glass, which showed higher compressive strength and good water resistance.

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Summary: This study examines the influence mechanism of phosphorus impurities in phosphogypsum on the structure and properties of gypsum. The soluble phosphorus impurities have a significant retarding effect on hydroxypropyl methyl cellulose ether (HPMC)-modified gypsum, decreasing the heat of hydration in the early stage and reducing water retention and mechanical strengths. The insoluble phosphorus impurity, Ca3(PO4)2, has no effect on the modified gypsum. The presence of soluble phosphorus in the solution leads to the formation of insoluble calcium phosphate, which delays the hydration reaction of gypsum and decreases the heat release. Additionally, the amount of soluble phosphorus decreases the polarity of the HPMC molecule and weakens the hydrogen bond, resulting in decreased water retention.

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New insights into the effect of gypsum on hydration and elasticity development of C3S paste during setting

Tingjie Huang et al.

Summary: The addition of gypsum accelerates the development of elasticity in the early stage of cement setting, but delays further improvement of elasticity in the later stage.

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Performance of green binder developed from flue gas desulfurization gypsum incorporating Portland cement and large-volume fly ash

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Junying Zhao et al.

Summary: The aluminate hydration products of Portland cement, such as ettringite and AFm phases, play a crucial role in the chloride chemical binding and microstructure development of cement pastes. Among them, the Mc phase exhibits the highest volume stability and elastic modulus. Furthermore, the electronic properties indicate that charge transfer between CO32- and Ca2+ strengthens their bonding states.

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Effects of C$H2 and CH on Strength and Hydration of Calcium Sulphoaluminate Cement Prepared from Phosphogypsum

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Summary: This study investigates the use of mineral admixtures to adjust the performance of calcium sulphoaluminate cement prepared from phosphogypsum. The results show that adjusting the blending levels can improve the compressive strength and hydration properties of the cement. Adding gypsum dihydrate promotes the hydration of the cement, while adding calcium hydroxide reduces the compressive strength.

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Reuse of phosphogypsum as hemihydrate gypsum: The negative effect and content control of H3PO4

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Summary: This study verified the efficiency of using bromocresol purple (BCP) dye as an acid-base indicator to determine the dry state of gypsum plaster. The addition of the indicator did not affect the workability time of the paste. Different dosages of the indicator resulted in variations in compressive strength, hardness, and tensile adhesion strength of the gypsum plaster.

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Chengwen Xu et al.

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Jose S. Andrade Neto et al.

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