A new view on the kinetics of tricalcium silicate hydration
- Laboratoire Interdisciplinaire Carnot de Bourgogne UMR6303 CNRS, Université de Bourgogne, 9 avenue Alain Savary, BP 47870, 21078 Dijon Cedex (France)
C{sub 3}S hydration is an interesting example of chemical coupling between C{sub 3}S dissolution, C–S–H and portlandite precipitation. It occurs because Ca{sup 2+}, OH{sup −} and silicate ions are present in C{sub 3}S, in both hydration products and in the surrounding solution. Various experimental data sets reveal that the undersaturation with respect to C{sub 3}S always increases when C{sub 3}S hydration enters into the deceleratory phase, leading to the conclusion that C{sub 3}S dissolution is at the origin of this deceleration, not C–S–H growth. In addition, as soon as portlandite precipitates, the dissolution limits the hydration already in the acceleratory hydration step. The evolution of the undersaturation cannot account for the hydration peak. Rather, it results from an extension and subsequently a decrease of the C{sub 3}S reactive surface area. The formation and coalescence of dissolution etch-pits can provide a reasonable explanation for the C{sub 3}S hydration kinetics.
- OSTI ID:
- 22696566
- Journal Information:
- Cement and Concrete Research, Vol. 86; Other Information: Copyright (c) 2016 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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