| Titre : |
Sur l'origine de la cohésion du ciment |
| Type de document : |
texte imprimé |
| Auteurs : |
Roland J.-M. Pellenq, Auteur |
| Année de publication : |
2004 |
| Article en page(s) : |
p. 12-22 |
| Note générale : |
Bibliogr. |
| Langues : |
Français (fre) |
| Catégories : |
Hydrates
Matériaux cimentaires
Simulation par ordinateur
Surfaces (technologie)
|
| Index. décimale : |
620.13 Matériaux de construction : pierre, ciment, béton, liants de |
| Résumé : |
On the origin of cement cohesion In this work, we aim at giving some insights on cement hydrate cohesion. Within the frame of colloid thermodynamics, we show that so-called correlation forces, already known as being responsible for the mechanical properties of clay materials such as calcium montmorillonite, lead to an attractive behaviour between two equally charged planar surfaces taken as a nanometric model of cement hydrates at sufficient electrostatic coupling (high surface charge density and ion valency). However the limits of such an approach at small interlammellar separation and the comparison with experiment lead us to consider cement cohesion at an atomistic level of details assuming that cement hydrates have a structure similar to that of a natural calcio-silicate mineral called tobermorite. Such mesoscale and molecular simulation studies provide strong arguments for predicting that medium- and short-range surface forces mediated by partially or totally hydrated calcium ions are the essential components of cement strength. This provides a clue for understanding the nano- and meso-structure of cement-based materials and new levers for improving their properties. |
| En ligne : |
https://www.lactualitechimique.org/Sur-l-origine-de-la-cohesion-du-ciment |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4546 |
in L'ACTUALITE CHIMIQUE > N° 273 (03/2004) . - p. 12-22
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