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Kinetics of calcium sulfoaluminate formation from tricalcium aluminate, calcium sulfate and calcium oxide
The formation kinetics of tricalcium aluminate (C3A) and calcium sulfate yielding calcium sulfoaluminate (C4A3) and the decomposition kinetics of calcium sulfoaluminate were investigated by sintering a mixture of synthetic C3A and gypsum. The quantitative analysis of the phase composition was performed by X-ray powder diffraction analysis using the Rietveld method. The results showed that the formation reaction 3Ca3Al2O6 + CaSO4 → Ca4Al6O12(SO4) + 6CaO was the primary reaction < 1350 °C with and activation energy of 231 ± 42 kJ/mol; while the decomposition reaction 2Ca4Al6O12(SO4) + 10CaO → 6Ca3Al2O6 + 2SO2 ↑ + O2 ↑ primarily occurred beyond 1350 °C with an activation energy of 792 ± 64 kJ/mol. The optimal formation region for C4A3 was from 1150 °C to 1350 °C and from 6 h to 1 h, which could provide useful information on the formation of C4A3 containing clinkers. The Jander diffusion model was feasible for the formation and decomposition of calcium sulfoaluminate. Ca2 + and SO42 − were the diffusive species in both the formation and decomposition reactions.
Kinetics of calcium sulfoaluminate formation from tricalcium aluminate, calcium sulfate and calcium oxide
The formation kinetics of tricalcium aluminate (C3A) and calcium sulfate yielding calcium sulfoaluminate (C4A3) and the decomposition kinetics of calcium sulfoaluminate were investigated by sintering a mixture of synthetic C3A and gypsum. The quantitative analysis of the phase composition was performed by X-ray powder diffraction analysis using the Rietveld method. The results showed that the formation reaction 3Ca3Al2O6 + CaSO4 → Ca4Al6O12(SO4) + 6CaO was the primary reaction < 1350 °C with and activation energy of 231 ± 42 kJ/mol; while the decomposition reaction 2Ca4Al6O12(SO4) + 10CaO → 6Ca3Al2O6 + 2SO2 ↑ + O2 ↑ primarily occurred beyond 1350 °C with an activation energy of 792 ± 64 kJ/mol. The optimal formation region for C4A3 was from 1150 °C to 1350 °C and from 6 h to 1 h, which could provide useful information on the formation of C4A3 containing clinkers. The Jander diffusion model was feasible for the formation and decomposition of calcium sulfoaluminate. Ca2 + and SO42 − were the diffusive species in both the formation and decomposition reactions.
Kinetics of calcium sulfoaluminate formation from tricalcium aluminate, calcium sulfate and calcium oxide
Li, Xuerun (author) / Zhang, Yu (author) / Shen, Xiaodong (author) / Wang, Qianqian (author) / Pan, Zhigang (author)
Cement and Concrete Research ; 55 ; 79-87
2014
9 Seiten, 57 Quellen
Article (Journal)
English
| British Library Online Contents | 2014
Expansion mechanisms in calcium aluminate and sulfoaluminate systems with calcium sulfate
| Online Contents | 2014