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Interactions between Polymeric Dispersants and Calcium Silicate Hydrates
Author(s) -
Popova Alla,
Geoffroy Ghita,
RenouGonnord MarieFrance,
Faucon Pascal,
Gartner Ellis
Publication year - 2000
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2000.tb01590.x
Subject(s) - calcium silicate hydrate , dispersant , polymer , chemical engineering , silicate , materials science , calcium silicate , superplasticizer , mineralogy , cement , chemistry , dispersion (optics) , composite material , physics , optics , engineering
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 29 Si 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.