Interactions between Polymeric Dispersants and Calcium Silicate Hydrates |
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Authors: | Alla Popova,Ghita Geoffroy,Marie-France Renou-Gonnord,Pascal Faucon,Ellis Gartner, |
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Affiliation: | Laboratoire des Mécanismes Réactionnels, CNRS-UMR 9176, Ecole Polytechnique, F-91128, Palaiseau Cedex, France;Commisariat ál'Energie Atomique, DSM/DRECAM/LSI, Ecole Polytechnique F-91128, Palaiseau Cedex, France;Commisariat ál' Energie Atomique, DSM/DRECAM/SCM, F-91191, Gif sur Yvette, France;Lafarge, Laboratoire Central de Recherche, B. P. 15-38291, St. Quentin Fallavier Cedex, France |
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Abstract: | To better understand the mechanism of interaction between hydrating silicate-based cements and polymeric dispersants of the type used as superplasticizers in modern construction concretes, two different types of polymeric dispersant were added (at concentrations of 1 and 10 g/L) during the synthesis of calcium silicate hydrate (C-S-H) via the pozzolanic reaction in dilute slurries of lime and reactive silica, at Ca/Si ratios in the range of 0.66–1.50. Although both polymers gave degrees of adsorption of >79% in all cases studied, no significant structural modifications of the resulting C-S-H products were observed via X-ray diffraction or 29Si magic angle spinning–nuclear magnetic resonance. These results differ from recent work in which it was shown that similar types of polymer could intercalate into the interlayers of C-S-H that was made using an alternative process. It is suggested that the process by which the C-S-H is formed may have a strong influence on whether C-S-H can intercalate polymers. This observation is relevant to understanding the fate of such polymers in concrete. |
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Keywords: | calcium silicate hydrate cements dispersants/dispersion |
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