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- Title
Review on Characteristics of Fluidized Bed Combustion Ashes and Key Issues in Their Application as Cement Admixtures.
- Authors
LIU Hulin; WANG Zhao; WU Yuanting; REN Siqian; WANG Wei; HAN Guiying
- 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.
- Publication
Bulletin of the Chinese Ceramic Society, 2021, Vol 40, Issue 6, p2052
- ISSN
1001-1625
- Publication type
Article