Synergistic effect of red mud, desulfurized gypsum and fly ash in cementitious materials: Mechanical performances and microstructure

Wang, Yaguang; Liu, Xiaoming; Zhu, Xiang; Zhu, Wenxi; Yue, Jianwei

doi:10.1016/j.conbuildmat.2023.133302

Cited by 22 publications

(2 citation statements)

References 36 publications

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“…Ettringite is a kind of hydrated calcium-aluminium sulphate generated by elements such as calcium, aluminium and sulphur in cementitious systems and can provide compressive strength for cementitious systems at the initial stage of the hydration reaction. It is beneficial to the development of the mechanical properties of cementitious systems [29]. The gradual weakening of the Ca(OH) 2 diffraction peaks in the cementitious systems indicates that the CCR in the cementitious systems is gradually consumed with the prolongation of the age of curing, promoting the pozzolanic reaction and the hydration of the GBFS in the cementitious systems, as well as the formation of hydration products.…”

Section: Hydration Products and Chemical Structure Of Cementitious Sy...mentioning

confidence: 99%

Study on the Properties and Hydration Mechanism of Calcium Carbide Residue-Based Low-Carbon Cementitious Materials

Wang,

et al. 2024

Buildings

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Alkali-activated cementitious materials, as an environmentally friendly cementitious material, can effectively reduce carbon emissions and improve the utilisation of solid wastes. However, traditional strong alkali activators have limitations such as high carbon emissions and poor safety. In order to overcome the defects of traditional strong alkaline activators and realise the high value-added use of calcium carbide residue (CCR), this paper adopts CCR as an alkaline activator to activate granulated blast furnace slag (GBFS)-steel slag (SS) cementitious systems for the preparation of alkaline-activated cementitious materials. The effects of CCR content and SS content on the compressive strength and working performance of CCR-GBFS-SS cementitious systems are analysed, along with the hydration process of CCR-GBFS-SS cementitious systems and the mechanism of action through the hydration products, their chemical structure and their microscopic morphology. The research results show that CCR-GBFS-SS cementitious systems have a 28-day compressive strength of 41.5 MPa and they can be controlled by the setting time; however, the flow performance is poor. The SS content can be increased to improve the flow performance; however, this will reduce the compressive strength. In CCR-GBFS-SS cementitious systems, CCR is the main driving force of hydration reactions, GBFS mainly provides active silica and aluminium and the amorphous C-(A)-S-H gel and ettringite formed by the synergistic action of multiple solid wastes are the main sources of compressive strength. With the extension of the curing time, the amount of hydration products in the cementitious systems gradually increases and the matrix of the cementitious systems gradually becomes denser. This study will provide a reference for the consumption of low-value solid waste such as CCR and the preparation of low-carbon cementitious materials from multi-component solid wastes.

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Section: Hydration Products and Chemical Structure Of Cementitious Sy...mentioning

confidence: 99%

Study on the Properties and Hydration Mechanism of Calcium Carbide Residue-Based Low-Carbon Cementitious Materials

Wang,

et al. 2024

Buildings

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“…DG, as a raw material for building material production, produces no discharge of waste residue or waste water during recycling and utilization [17], and has been widely used in cementitious materials [52]. DG, a sulfate solid waste, reacts rapidly with alkaline solid waste in combination with reactive silica-alumina solid waste [40]. Cementitious materials were prepared using red mud, fly ash, and DG.…”

Section: Cementitious Materialsmentioning

confidence: 99%

Application of the Industrial Byproduct Gypsum in Building Materials: A Review

Xie,

Liu,

Zhang

et al. 2024

Materials

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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 have been partially utilized in cementitious materials, cement retarders, etc., while the prospects for the utilization of other byproduct gypsums remain worrying. This paper mainly focuses on the sources and physicochemical properties of various types of gypsum byproducts and summarizes the application scenarios of various gypsums in construction materials. Finally, some suggestions are proposed to solve the problem of the industrial byproduct gypsum. This review is informative for solving the environmental problems caused by gypsum accumulation.

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Preparation of steel slag-based cementitious materials compounded with GBFS and phosphogypsum: mix design, hydration, and microstructure characteristic

Sun,

Hou,

Guo

et al. 2024

J Therm Anal Calorim

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Synergistic effect of red mud, desulfurized gypsum and fly ash in cementitious materials: Mechanical performances and microstructure

Cited by 22 publications

References 36 publications

Study on the Properties and Hydration Mechanism of Calcium Carbide Residue-Based Low-Carbon Cementitious Materials

Study on the Properties and Hydration Mechanism of Calcium Carbide Residue-Based Low-Carbon Cementitious Materials

Application of the Industrial Byproduct Gypsum in Building Materials: A Review

Preparation of steel slag-based cementitious materials compounded with GBFS and phosphogypsum: mix design, hydration, and microstructure characteristic

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