Synthesis and Formation Process of a Typical Doped Solid-Solution Ye’elimite (Ca3.8Na0.2Al5.6Fe0.2Si0.2SO16): Experiments and Kinetic Analysis
| Autor: | Chunyi Cui, Jiuye Zhao, Chunyang Yu, Jiazhi Huang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Technology
Materials science QH301-705.5 Aluminate QC1-999 Sintering Activation energy chemistry.chemical_compound Phase (matter) General Materials Science Biology (General) Instrumentation QD1-999 Fluid Flow and Transfer Processes Cement Ye'elimite Process Chemistry and Technology Physics General Engineering Engineering (General). Civil engineering (General) ye’elimite Rietveld method Computer Science Applications Chemistry formation process Chemical engineering chemistry kinetic analysis TA1-2040 calcium sulfoaluminate cement Stoichiometry Solid solution |
| Zdroj: | Applied Sciences, Vol 11, Iss 8015, p 8015 (2021) Applied Sciences Volume 11 Issue 17 |
| ISSN: | 2076-3417 |
| Popis: | Ye’elimite is a dominant phase in calcium sulfoaluminate cement, which is a promising alternative type of cementitious binder. Ca3.8Na0.2Al5.6Fe0.2Si0.2SO16 (abbreviated as ss-C4A3$) is a kind of typical doped solid-solution ye’elimite. In this study, the formation process of ss-C4A3$ was investigated. Clinkers of ss-C4A3$ were sintered at various temperatures for different holding times. X-ray diffraction tests and Rietveld quantitative phase analysis were conducted to determine the phase compositions of the clinkers. Meanwhile, the formation process of ss-C4A3$ was analyzed by kinetic theory. The results show that solid reactions between intermediate phases (calcium aluminate phases) and anhydrite mainly resulted in the formation of ss-C4A3$. In the conditions of 1150–1250 °C, ss-C4A3$ tended to be formed and stable until 4 h. However, when the sintering temperature was 1300 °C, the ss-C4A3$ decreased to generate calcium aluminate phases after 2 h. Compared to other kinetic models, the three-dimensional diffusion model mostly conformed with the formation process of ss-C4A3$, and the fitting results obtained by the Jander model exhibited the highest correlation coefficients. The activation energy of ss-C4A3$ formation equaled 285.6 kJ/mol, which was smaller than that of stoichiometric ye’elimite. |
| Databáze: | OpenAIRE |
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