Abstract
A study to understand and quantify the growth mode of C-S-H during the hydration of tricalcium silicate grains is presented here based upon number of complementary approaches: study of C-S-H nucleation during the hydration of tricalcium silicate compared with experimental studies of homogeneous nucleation; experimental kinetics studies of C-S-H formation during tricalcium silicate hydration in dilute suspensions; direct observations of C-S-H growth by Atomic Force Microscopy; Simulation of curves obtained from experiments in dilute suspensions from a model based on AFM observations. With AFM the formation of CSH is observed by the agglomeration of identical elements 60×30×5 nm3 in size on alite surface. This agglomeration takes place perpendicularly and parallel to the surface. Numerical simulation of the experimental curves of the degree of hydration versus time enabled us to quantify the variation of the growth rates parallel and perpendicular to the surface with lime concentration. It is shown that the growth rate of C-S-H only depends on the lime concentration in solution.
Résumé
Une étude pour comprendre et mesurer le mode de croissance de C-S-H pendant l'hydration des grains de silicate tricalcique est présentée ici, basée sur un certain nombre d'approches complémentaires: l'étude de la nucléation de C-S-H pendant l'hydration du silicate tricalcique comparée aux études expérimentales de nucléation homogène; études expérimentales de cinétique de formation de C-S-H pendant l'hydration du silicate tricalcique dans les suspensions diluées; observations directes de croissance de C-S-H par microscopie de Force Atomique; simulation des courbes obtenues à partir des expériences dans les suspensions diluées à partir d'un modèle basé sur des observations AFM. L'AFM permet d'observer la formation de CSH par l'agglomération d'éléments de tailles identiques de 60×30×5 nm3 sur la surface d'alite. Cette agglomération a lieu perpendiculairement et parallèlement à la surface. La simulation numérique des courbes expérimentales du degré d'hydration en fonction du temps nous a permis de mesurer la variation des taux de croissance parallèle et perpendiculaire à la surface avec la concentration en chaux. On montre que le taux de croissance le taux de C-S-H dépend seulement de la concentration en chaux en solution.
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Editorial Note Dr. André Nonat is a RILEM Senior Member.
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Garrault, S., Finot, E., Lesniewska, E. et al. Study of C-S-H growth on C3S surface during its early hydration. Mat. Struct. 38, 435–442 (2005). https://doi.org/10.1007/BF02482139
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DOI: https://doi.org/10.1007/BF02482139