Review on Characteristics of Fluidized Bed Combustion Ashes and Key Issues in Their Application as Cement Admixtures

Abstract

Abstract: Fluidized bed combustion (FBC) ash is an effective technology for burning the fuels containing sulphur with low SO₂ emissions. It is an important issue that how to utilize the FBC ashes in an efficient and clean way. In this paper, the major characteristics of FBC ashes in terms of chemical and mineral compositions, microstructures, properties were reviewed. Compared with fly ashes and other by-products from coal burning, FBC ashes with porous structure contain free CaO, CaSO₄ and amorphous aluminosilicate, which leads to the obvious pozzolanic activity, self-hardening and hydration expansion. At the same time, several key issues in the application of FBC ashes as cement admixtures base on their composition, microstructure and properties were discussed. The results show that suitable activators should be used to enhance the activity of ashes. The stability needs to be improved by adjusting the curing process, water-cement ratio and other conditions. Adding water reducing agents controls the water requirement and increases cement strength. This provides some guidances for effective utilization of the building materials with FBC ashes.

Key words: fluidized bed combustion ash, composition, microstructure, hydration activity, cement admixture

CLC Number:

TU528

LIU Hulin, WANG Zhao, WU Yuanting, REN Siqian, WANG Wei, HAN Guiying. Review on Characteristics of Fluidized Bed Combustion Ashes and Key Issues in Their Application as Cement Admixtures[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(6): 2052-2061.

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