Mechanical Properties and Mechanism of Desulphurized Gypsum-Waste Cement Carbonized Recycled Block

Abstract

Abstract: In this paper, the recycling of waste cement is the research goal, a desulphurized gypsum-waste cement system was constructed, and the effect of carbonization on the mechanical properties and apparent density of the desulphurized gypsum-waste cement system was evaluated. The composition, chemical structure and morphology changes of the recycled blocks were revealed by XRD, FTIR and SEM. The results show that the carbonization of waste cement can proceed smoothly in the presence of gypsum. The carbonization process can effectively improve the compressive strength of desulphurized gypsum-waste cement samples. When the water-cement ratio is 0.4 and the waste cement content is 60% (mass fraction), the compressive strength of carbonized sample increases by 108.3% compared with that of the uncarbonized sample. When the water-cement ratio is 0.8 and the waste cement content is 65% (mass fraction), the compressive strength of carbonized sample increases by 270.0% compared with that of the uncarbonized sample. The chemical structure and microstructure of carbonized products can be controlled by adjusting water-cement ratio and waste cement content. The carbonization process can promote the hydration of waste cement, enhance the mechanical properties of the system, and reduce the apparent density of the block. The research results will provide a new idea and a reliable recycling scheme for the comprehensive utilization of waste cement and desulphurized gypsum.

Key words: waste cement, desulphurized gypsum, carbonization, recycled block, calcium carbonate

CLC Number:

TU522.1⁺9

LIU Mingdi, QIN Ji, DONG Chen, ZHU Ying. Mechanical Properties and Mechanism of Desulphurized Gypsum-Waste Cement Carbonized Recycled Block[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(11): 4035-4041.

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