Physical and Chemical Aspects of the Nucleation of Cement-Based Materials
A theoretical model of the nucleation of portlandite is proposed, and the critical size of a portlandite cluster and the energy barrier of nucleation are determined. The steady state nucleation rate and the time lag of the nucleation of portlandite are estimated for a pure solution of Ca(OH)<sub&...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
CTU Central Library
2012-01-01
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| Series: | Acta Polytechnica |
| Subjects: | |
| Online Access: | https://ojs.cvut.cz/ojs/index.php/ap/article/view/1668 |
| Summary: | A theoretical model of the nucleation of portlandite is proposed, and the critical size of a portlandite cluster and the energy barrier of nucleation are determined. The steady state nucleation rate and the time lag of the nucleation of portlandite are estimated for a pure solution of Ca(OH)<sub>2</sub> in water. Possible connections with the corresponding properties for cement paste are discussed. A new method is developed for experimentally determining the concentration of Ca<sup>2+</sup> ions during the initial stage of hydration of a cement paste. The time dependence of Ca<sup>2+</sup> ions is measured for various water-to-cement ratio values. The results are discussed from the point of view of existing models of the induction period. |
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| ISSN: | 1210-2709 1805-2363 |