Paper Title:

Nucleation of Portlandite Clusters in Cement Paste at Very Early Stage of Hydration

Periodical Materials Science Forum (Volumes 636 - 637)
Main Theme Advanced Materials Forum V
Edited by Luís Guerra ROSA and Fernanda MARGARIDO
Pages 1234-1238
DOI 10.4028/www.scientific.net/MSF.636-637.1234
Citation Pavel Demo et al., 2010, Materials Science Forum, 636-637, 1234
Online since January, 2010
Authors Pavel Demo, Alexej Sveshnikov, Šárka Hošková, Petra Tichá, Zdeněk Kožíšek
Keywords Critical Size of Cluster of Portlandite, Hydrating Cement Paste, Nucleation
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Abstract

A very early stage of cement paste hydration is studied at microscopic level of description. Within context of nucleation theory the critical (and, thus, growable) size of clusters of calcium hydroxide (so-called portlandite) is estimated for chosen water to cement ratios at given temperature. Furthermore, also the barrier of portlandite nulceation is determined. It is shown that these static characteristics of process are practically unchanged contrary to number density of portlandite critical clusters formed in unit volume of mixture per unit time.