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Aspects physico-chimiques de l'interaction des éthers de cellulose avec la matrice cimentaire

Abstract : Cellulose ethers are of universal use in factory-made mortars, though their influences on mortar properties at a molecular scale are poorly understood. Especially, a main issue deals with the control of secondary effects generated by these admixtures such as cement hydration retardation. In this frame, a study of the impact of cellulose ethers molecule parameters on cement hydration was carried out. Low influence of molecular weight was observed. On the contrary, our results emphasize that the substitution degree appears as the key parameter of the hydration delay mechanism. Moreover, cellulose ethers are very stable in alkaline media.We also show that the ability of cellulose ethers to complex calcium ions is negligible. Degradation of cellulose ethers and its impact on the cement hydration kinetics does not seem to be significant. Finally, a minor impact of cellulose ethers on the dissolution of anhydrous phases was observed. On the contrary, adsorption and conductometric experiments show a great influence of these admixtures on the nucleation-growth processes of calcium-aluminate hydrate, C-S-H and portlandite.
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Submitted on : Friday, January 5, 2007 - 5:45:26 PM
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  • HAL Id : tel-00122935, version 1


Jérémie Pourchez. Aspects physico-chimiques de l'interaction des éthers de cellulose avec la matrice cimentaire. Génie des procédés. Ecole Nationale Supérieure des Mines de Saint-Etienne, 2006. Français. ⟨tel-00122935⟩



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