Physical and Chemical Aspects of the Nucleation of Cement-Based Materials

Authors

  • Pavel Demo
  • Alexey Sveshnikov
  • Šárka Hošková
  • David Ladman
  • Petra Tichá

DOI:

https://doi.org/10.14311/1668

Keywords:

cement paste, induction period, calcium concentration, nucleation rate, time lag

Abstract

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)2 in water. Possible connections with the corresponding properties for cement paste are discussed. A new method is developed for experimentally determining the concentration of Ca2+ ions during the initial stage of hydration of a cement paste. The time dependence of Ca2+ 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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Published

2012-01-06

Issue

Vol. 52 No. 6 (2012)

Section

Articles

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How to Cite

Demo, P., Sveshnikov, A., Hošková, Šárka, Ladman, D., & Tichá, P. (2012). Physical and Chemical Aspects of the Nucleation of Cement-Based Materials. Acta Polytechnica, 52(6). https://doi.org/10.14311/1668