Mechanical, expansion and rheological properties of circulating fluidized bed fly ash based ecological cement: A critical review

Wei Zhang; Xiaoming Liu; Zengqi Zhang

doi:10.1007/s12613-021-2403-2

Volume 29 Issue 9

Sep. 2022

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2022 > 29(9): 1670-1682

Wei Zhang, Xiaoming Liu, and Zengqi Zhang, Mechanical, expansion and rheological properties of circulating fluidized bed fly ash based ecological cement: A critical review, Int. J. Miner. Metall. Mater., 29(2022), No. 9, pp. 1670-1682. https://doi.org/10.1007/s12613-021-2403-2

Cite this article as:

Wei Zhang, Xiaoming Liu, and Zengqi Zhang, Mechanical, expansion and rheological properties of circulating fluidized bed fly ash based ecological cement: A critical review, Int. J. Miner. Metall. Mater., 29(2022), No. 9, pp. 1670-1682. https://doi.org/10.1007/s12613-021-2403-2

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Invited Review

Mechanical, expansion and rheological properties of circulating fluidized bed fly ash based ecological cement: A critical review

+ Author Affiliations

Corresponding authors:
Xiaoming Liu E-mail: liuxm@ustb.edu.cn

Zengqi Zhang E-mail: zhangzq@ustb.edu.cn
Received: 23 August 2021; Revised: 6 November 2021; Accepted: 22 December 2021; Available online: 25 December 2021

Abstract

Abstract

Circulating fluidized bed fly ash (CFBFA) is a solid waste product from circulating fluidized bed (CFB) boilers in power plants, and the storage of CFBFA is increasingly become an environmental problem. Previous scholars have made contributions to improve the resource utilization of CFBFA. Especially, ecological cement is prepared by CFBFA, which is more conducive to its large-scale utilization. In recent years, a lot of effort has been paid to improve the properties of ecological cement containing CFBFA. In this work, the physicochemical properties of CFBFA are introduced, and recent research progress on the mechanical, expansion, and rheological properties of CFBFA based ecological cement (CEC) is extensively reviewed. The problem of over- expansion of f-CaO is summarized, which limits the scale application of CFBFA in ecological cement. Hence, the challenge for f-CaO in CFBFA to compensate for cement volume shrinkage is proposed, which is beneficial to the utilization of CFBFA in ecological cement, and the reduction of CO₂ emissions from the cement industry. In addition, the environmental performance, durability, and economy of CEC should be valued in future research, especially the environmental performance, because the CFBFA contains heavy metals, such as Cr, As, which may pollute groundwater.
- circulating fluidized bed fly ash;
- ecological cement;
- expansion;
- durability;
- compensation shrinkage

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