The di- and tricalcium silicate dissolutions
- Institut Carnot de Bourgogne UMR5209 CNRS, 9 avenue Alain Savary, BP 47870, 21078 Dijon Cedex (France)
In this study, a specially designed reactor connected to an ICP spectrometer enabled the careful determination of the dissolution rates of C{sub 3}S, C{sub 2}S and CaO, respectively, over a broad range of concentration of calcium and silicates under conditions devoid of C–S–H. The kinetic laws, bridging the dissolution rates and the undersaturations, were obtained after extrapolation of rate zero allowing the estimation of the true experimental solubility products of C{sub 3}S (K{sub sp} = 9.6 · 10{sup −23}), C{sub 2}S (K{sub sp} = 4.3 · 10{sup −18}) and CaO (K{sub sp} = 9.17 · 10{sup −6}). The latter are then compared to the solubilities calculated from the enthalpies of formation. We propose that the observed deviations result from the protonation of the unsaturated oxygen atoms present at the surface of these minerals. Hydration rates measured in cement pastes or in C{sub 3}S pastes are in excellent agreement with the kinetic law found in this study for C{sub 3}S under conditions undersaturated with respect to C–S–H.
- OSTI ID:
- 22220795
- Journal Information:
- Cement and Concrete Research, Vol. 47; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0008-8846
- Country of Publication:
- United States
- Language:
- English
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