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Rhéologie de suspensions concentrées de carbonate de calcium en présence de fluidifiant

Abstract : This study deals with the industrial context where the superplasticizers are used to manufacture the high performance cements. To better understand the action mode of plasticizing molecules, we used a model system which consists of calcium carbonate particles suspensions: in one hand, commercial microparticles suspension, and in the other hand, self synthesized nanoparticles suspensions. The study focuses on the use of five organic plasticizers: four types of polymethacrylates grafted polyoxyethylene (PCP) with different lengths of grafts, and a diphosphonate polyoxyethylene (OPTIMA100).Characterization of the plasticizers relevant parameters such as their complextation with the ions, their ionization degree, their size, their affinity with the solvent and their adsorption ability on the particles surfaces was performed. Significant differences in the effectiveness of these thinners regarding to the rheology and sedimentation of the two types of suspension were identified. These discrepancies in the behavior were interpreted by means of; the characterization performed on the thinners, and modeling of interparticle forces.
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Romain Morini. Rhéologie de suspensions concentrées de carbonate de calcium en présence de fluidifiant. Autre [cond-mat.other]. Université Nice Sophia Antipolis, 2013. Français. ⟨NNT : 2013NICE4111⟩. ⟨tel-00950039⟩

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