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Influence des paramètres morphologiques des granulats sur le comportement rhéologique des bétons frais : étude sur systèmes modèles

Abstract : Natural alluvial aggregates compose up to 70 at 80% of the volume of today's concrete and now represent for a non-renewable resource whose accessibility is reduced. Actually, concrete mix designs tend to increase the share of aggregate crushed rock mass. These materials have a very different morphology because of their manufacturing process. The substitution of rolled aggregates by crushed aggregates affects the concrete workability. At first, we study specifically the influence of the morphology of the aggregates on the packing properties. We show that the aspect ratio strongly affects the dense and random loose packing. However, for particles of the same aspect ratio, the impact of the convexity of the measure of dense packing is low. In a second step, we go further in our study by measuring the rheological behavior of our systems composed of inverse emulsion and monodisperse sands. To that purpose, we construct flow curves at the local scale thanks to a magnetic resonance imager. We show that this method is, nowadays, the most accurate for viscosity measurements because it takes into account the migration and location of the material during flow. We also show that the aspect ratio control everything of a rheological point of view in the regime where there is no percolated network of contacts between particles
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Submitted on : Thursday, May 10, 2012 - 11:37:46 AM
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Hamid Hafid. Influence des paramètres morphologiques des granulats sur le comportement rhéologique des bétons frais : étude sur systèmes modèles. Autre. Université Paris-Est, 2012. Français. ⟨NNT : 2012PEST1026⟩. ⟨tel-00695922⟩

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