A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Kinetics of calcium sulfoaluminate formation from tricalcium aluminate, calcium sulfate and calcium oxide
https://orcid.org/0000-0001-8570-8566
Abstract The formation kinetics of tricalcium aluminate (C3A) and calcium sulfate yielding calcium sulfoaluminate (C4A3$) and the decomposition kinetics of calcium sulfoaluminate were investigated by sintering a mixture of synthetic C3A and gypsum. The quantitative analysis of the phase composition was performed by X-ray powder diffraction analysis using the Rietveld method. The results showed that the formation reaction 3Ca3Al2O6 +CaSO4 →Ca4Al6O12(SO4)+6CaO was the primary reaction <1350°C with and activation energy of 231±42kJ/mol; while the decomposition reaction 2Ca4Al6O12(SO4)+10CaO→6Ca3Al2O6 +2SO2 ↑+O2 ↑ primarily occurred beyond 1350°C with an activation energy of 792±64kJ/mol. The optimal formation region for C4A3$ was from 1150°C to 1350°C and from 6h to 1h, 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 SO4 2− were the diffusive species in both the formation and decomposition reactions.
Highlights Formation and decomposition of calcium sulphoaluminate were studied. Decomposition of calcium sulphoaluminate combined CaO and yielded C3A. Activation energy for formation was 231±42kJ/mol. Activation energy for decomposition was 792±64kJ/mol. Both the formation and decomposition were controlled by diffusion.
Kinetics of calcium sulfoaluminate formation from tricalcium aluminate, calcium sulfate and calcium oxide
https://orcid.org/0000-0001-8570-8566
Abstract The formation kinetics of tricalcium aluminate (C3A) and calcium sulfate yielding calcium sulfoaluminate (C4A3$) and the decomposition kinetics of calcium sulfoaluminate were investigated by sintering a mixture of synthetic C3A and gypsum. The quantitative analysis of the phase composition was performed by X-ray powder diffraction analysis using the Rietveld method. The results showed that the formation reaction 3Ca3Al2O6 +CaSO4 →Ca4Al6O12(SO4)+6CaO was the primary reaction <1350°C with and activation energy of 231±42kJ/mol; while the decomposition reaction 2Ca4Al6O12(SO4)+10CaO→6Ca3Al2O6 +2SO2 ↑+O2 ↑ primarily occurred beyond 1350°C with an activation energy of 792±64kJ/mol. The optimal formation region for C4A3$ was from 1150°C to 1350°C and from 6h to 1h, 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 SO4 2− were the diffusive species in both the formation and decomposition reactions.
Highlights Formation and decomposition of calcium sulphoaluminate were studied. Decomposition of calcium sulphoaluminate combined CaO and yielded C3A. Activation energy for formation was 231±42kJ/mol. Activation energy for decomposition was 792±64kJ/mol. Both the formation and decomposition were controlled by diffusion.
Kinetics of calcium sulfoaluminate formation from tricalcium aluminate, calcium sulfate and calcium oxide
https://orcid.org/0000-0001-8570-8566
Abstract The formation kinetics of tricalcium aluminate (C3A) and calcium sulfate yielding calcium sulfoaluminate (C4A3$) and the decomposition kinetics of calcium sulfoaluminate were investigated by sintering a mixture of synthetic C3A and gypsum. The quantitative analysis of the phase composition was performed by X-ray powder diffraction analysis using the Rietveld method. The results showed that the formation reaction 3Ca3Al2O6 +CaSO4 →Ca4Al6O12(SO4)+6CaO was the primary reaction <1350°C with and activation energy of 231±42kJ/mol; while the decomposition reaction 2Ca4Al6O12(SO4)+10CaO→6Ca3Al2O6 +2SO2 ↑+O2 ↑ primarily occurred beyond 1350°C with an activation energy of 792±64kJ/mol. The optimal formation region for C4A3$ was from 1150°C to 1350°C and from 6h to 1h, 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 SO4 2− were the diffusive species in both the formation and decomposition reactions.
Highlights Formation and decomposition of calcium sulphoaluminate were studied. Decomposition of calcium sulphoaluminate combined CaO and yielded C3A. Activation energy for formation was 231±42kJ/mol. Activation energy for decomposition was 792±64kJ/mol. Both the formation and decomposition were controlled by diffusion.
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
2013-10-04
9 pages
Article (Journal)
Electronic Resource
English
| British Library Online Contents | 2014