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Analyse des interactions entre diverses argiles et des polymères spécifiques, en milieu cimentaire, en présence de superplastifiant

Abstract : Clay minerals which can be found in granular materials strongly influence the rheological properties of fresh concrete. Due to the recent technical evolution of concrete, the understanding of the effect of clays in such systems takes on a significant industrial interest. This study was divided into two part, the first one dealing with the adsorption mechanisms of two polymers onto clay surfaces: a superplasticizer (PCP) and a polycation (F25). IR and SAXS-WAXS analysis together with adsorption measurment revealed that superplasticizer are adsorbed by clays and that the used of polycation inhibites clays-PCP interactions. The adsorption process of F25 onto clays by cationic exchange explains the preferential adsorption of cationic compounds rather than PCP and the restructuration of clay particles at the nano and micronic scale during the adsorption. In a second part, the rheological study of granular suspensions revealed a strong effect of clay particles on the flow behaviors of such systems. The rheological study of pure clay suspensions allowed the modelisation of the effect of clays on granular suspensions using excluded volume. In this case, the anistropic features of clays particles characterized by various technics (TEM, SAXS-WAXS) explains water retention properties of such nanometric minerals
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Submitted on : Friday, May 21, 2021 - 3:23:41 PM
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  • HAL Id : tel-01754526, version 1


Christian Blachier. Analyse des interactions entre diverses argiles et des polymères spécifiques, en milieu cimentaire, en présence de superplastifiant. Sciences de la Terre. Institut National Polytechnique de Lorraine, 2009. Français. ⟨NNT : 2009INPL034N⟩. ⟨tel-01754526⟩



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