Synthesis and Formation Process of a Typical Doped Solid-Solution Ye’elimite (Ca3.8Na0.2Al5.6Fe0.2Si0.2SO16): Experiments and Kinetic Analysis

Ye’elimite is a dominant phase in calcium sulfoaluminate cement, which promising alternative type of cementitious binder. Ca3.8Na0.2Al5.6Fe0.2Si0.2SO16 (abbreviated as ss-C4A3$) kind typical doped solid-solution ye’elimite. In this study, the formation process ss-C4A3$ was investigated. Clinkers were sintered at various temperatures for different holding times. X-ray diffraction tests and Rietveld quantitative analysis conducted to determine compositions clinkers. Meanwhile, analyzed by kinetic theory. The results show that solid reactions between intermediate phases (calcium aluminate phases) anhydrite mainly resulted ss-C4A3$. conditions 1150–1250 °C, tended be formed stable until 4 h. However, when sintering temperature 1300 decreased generate after 2 Compared other models, three-dimensional diffusion model mostly conformed with ss-C4A3$, fitting obtained Jander exhibited highest correlation coefficients. activation energy equaled 285.6 kJ/mol, smaller than stoichiometric