Abstract
The growth rate of calcium-silicate-hydrate (C-S-H) was analyzed by following the evolution of calcium and silicon concentrations in supersaturated solutions. In these experiments, the supersaturated solution was produced by mixing a saturated calcium hydroxide solution and a solution obtained from the hydration of tricalcium silicate. A continuous decrease of the silicon concentration over time was observed during the experiments and the C-S-H formation rate was calculated from the amount of silicon that was precipitated between two consecutive analyses. The data obtained in this study demonstrate that the interfacial growth rate of C-S-H depends mainly on the supersaturation with respect to this phase, the availability of calcite as a substrate for heterogeneous nucleation and the calcium concentration in solution. A mean value of approximately 10 nmol of C-S-H per m2 per second was obtained for the interfacial growth rate of C-S-H in conditions that are relevant for the hydration of tricalcium silicate.
Original language | English (US) |
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Pages (from-to) | 236-244 |
Number of pages | 9 |
Journal | Cement and Concrete Research |
Volume | 103 |
DOIs | |
State | Published - Feb 21 2018 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Building and Construction
- General Materials Science
Keywords
- C-S-H
- Growth rate
- Kinetics