@article{YANG2022, 
author = {Qingchun YANG and Jiaming WU and Changqing HU and Teng NIU and Xiangyu HAN and Xueyan FENG and Zhengmao YE},
title = {Evolution and Formation Kinetics of Gehlenite Phase in Ordinary Sulfoaluminate Cement Clinker with Low Al2O3/SiO2 Ratio},
year = {2022},
journal = {Journal of the Chinese Ceramic Society},
volume = {50},
number = {7},
pages = {1972-1977},
keywords = {sulfoaluminate cement clinker, low alumina to silica ratio, gehlenite, formation kinetics},
url = {https://www.sciopen.com/article/10.14062/j.issn.0454-5648.20211015},
doi = {10.14062/j.issn.0454-5648.20211015},
abstract = {To reveal the mechanism of the inert gehlenite (C2AS) phase in sulfoaluminate cement clinker at a low Al2O3/SiO2 ratio, a series of clinkers were prepared at different calcination temperatures and holding time as well as a fixed Al2O3/SiO2 ratio of 2. The evolution of C2AS was investigated by X-ray diffraction combined with the Rietveld method and thermogravimetry-differential scanning calorimetry. The results show that C2AS is produced by the reaction of CaO, SiO2 and Al2O3 at 950-1200 ℃ . C2AS is mainly produced by the reaction of CA and CaO decomposed from C4A3＄ with the residual SiO2 when the temperature exceeds 1200 ℃ . It is indicated that the kinetics of the C2AS formation above 1200 ℃ is mainly controlled by the diffusion of Ca2+, and the activation energy of the reaction is (305±20) kJ/mol. This study provides a a guidance for the use of low-grade bauxite in the calcination of sulfoaluminate cement clinker.}
}