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Magnetic resonance in situ study of tricalcium aluminate hydration in the presence of gypsum
The hydration of tricalcium aluminate, in the presence of gypsum, is investigated using in situ 'real-time' 1.H NMR spin-spin relaxation, X-ray diffraction, and scanning electron microscope experiments. Aside from rapid ettringite formation within the first 45 min, it is shown that a re-distribution of water within the first 2 h contributes significantly to the retardation of the rate of hydration. From the 1.H NMR component with T2 of approximately 20 microseconds, the continual disappearance of ettringite and the production of the layered monosulfate structure is monitored. In addition, the technique makes possible the monitoring of the change in the quantity of interlayer water in monosulfate, as well as the time scale associated with the decrease in the effective interlayer spacing, resulting from the ionic substitution of SO4(2-) for OH(-). The ionic substitution within monosulfate starts after approximately 9 h. Although it has been believed that the time scale for this reaction is fast, we have shown that it can take days to reach completion.
Magnetic resonance in situ study of tricalcium aluminate hydration in the presence of gypsum
The hydration of tricalcium aluminate, in the presence of gypsum, is investigated using in situ 'real-time' 1.H NMR spin-spin relaxation, X-ray diffraction, and scanning electron microscope experiments. Aside from rapid ettringite formation within the first 45 min, it is shown that a re-distribution of water within the first 2 h contributes significantly to the retardation of the rate of hydration. From the 1.H NMR component with T2 of approximately 20 microseconds, the continual disappearance of ettringite and the production of the layered monosulfate structure is monitored. In addition, the technique makes possible the monitoring of the change in the quantity of interlayer water in monosulfate, as well as the time scale associated with the decrease in the effective interlayer spacing, resulting from the ionic substitution of SO4(2-) for OH(-). The ionic substitution within monosulfate starts after approximately 9 h. Although it has been believed that the time scale for this reaction is fast, we have shown that it can take days to reach completion.
Magnetic resonance in situ study of tricalcium aluminate hydration in the presence of gypsum
In-situ-Magnetresonanzuntersuchung der Tricalciumaluminathydratisierung in Gegenwart von Gips
Holly, R. (author) / Peemoeller, H. (author) / Zhang, M. (author) / Reardon, E. (author) / Hansson, C.M. (author)
Journal of the American Ceramic Society ; 89 ; 1022-1027
2006
6 Seiten, 3 Bilder, 2 Tabellen, 26 Quellen
Article (Journal)
English
Impact of welan gum on tricalcium aluminate-gypsum hydration
| Tema Archive | 2012
Hydration of tricalcium aluminate
| Engineering Index Backfile | 1932
Hydration of tricalcium aluminate
| Engineering Index Backfile | 1933
Hydration of tricalcium aluminate
| Engineering Index Backfile | 1933