Effect and Mechanism Analysis of CaF2 Sludge on Ordinary Portland Cement

Abstract

Abstract: Solid waste utilization is one of the important ways to achieve the goal of “double carbon”. Taking solid waste CaF₂ sludge as cement admixture, the effect of CaF₂ sludge content on the properties of cement cementing material was investigated through compressive strength and slurry fluidity tests, and the mechanism was analyzed by XRD, SEM and TGA-DSC microscopic characterization tests. The results show that the addition of CaF₂ sludge can improve the early strength of cement cementing material. The compressive strength of cement cementing material with 8% (mass fraction) CaF₂ sludge is better. The addition of CaF₂ sludge leads to the decrease of slurry fluidity, but the addition of less than 10% (mass fraction) has no significant effect on slurry fluidity, compared with the cement without CaF₂ sludge, the slurry fluidity of the cement with 8% and 10% (mass fraction) CaF₂ sludge is reduced by 3.0%. CaF₂ sludge mainly plays a physical effect in cementing material, and CaF₂ sludge can form more crystallization sites to promote cement hydration. The dilution effect and agglomeration effect of CaF₂ sludge to cement increase significantly. The microscopic properties of cement with 8% (mass fraction) CaF₂ sludge are better.

Key words: CaF₂ sludge, cement, compressive strength, slurry fluidity, microscopic mechanism

CLC Number:

TQ172

HU Chuan, YANG Wenwei, ZHAO Huanhuan. Effect and Mechanism Analysis of CaF₂ Sludge on Ordinary Portland Cement[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(3): 1030-1038.

References

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Effect and Mechanism Analysis of CaF₂ Sludge on Ordinary Portland Cement

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