Abstract
29Si magic angle spinning nuclear magnetic resonance spectroscopy has been used to investigate the effect of finely divided silica on the hydration of tricalcium silicate (C3S). In order to reduce the time needed to obtain quantitative results, low levels of paramagnetic iron oxide were added to materials to increase the nuclear relaxation rate. The reactions of the C3S and the finely divided silica could then be monitored separately and without chemical modification. The results were correlated with data from microcalorimetry, thermogravimetric analysis and electron microscopy. Under the conditions used here the presence of the silica accelerates greatly the hydration process, and results in a markedly increased degree of polymerization in the resulting gel, without significantly affecting the induction period of the reaction. The significance of these results for understanding the hydration process of C3S in the presence of silica is outlined.
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Dobson, C.M., Goberdhan, D.G.C., Ramsay, J.D.F. et al. 29Si MAS NMR study of the hydration of tricalcium silicate in the presence of finely divided silica. J Mater Sci 23, 4108–4114 (1988). https://doi.org/10.1007/BF01106844
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DOI: https://doi.org/10.1007/BF01106844