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Rhéologie des bétons fluides

Abstract : This research is devoted to the study of the rheology of fresh concrete. We relate the development of a new prototype rheometer for concrete: BT RHEOM. The principle, the adjustments of the apparatus, and the procedures for different tests are described. Some studies for estimating the objectivity of the measures are also presented. Later, we try to realise some experimental works with the BT RHEOM. The behaviours of the fresh concrete, with or without vibration, are studied. In the range of strain rate investigated, it is found that they follow generally the Bingham model, with some conditions about the consistency and the homogeneity of the concrete. The phenomena of thixotropy and dilatancy are discussed. We investigate also the influence of the parameters of the composition of concrete. A model is then established for estimating the plastic viscosity of high-performance concretes, which could give an aid to concrete mix-design. Finally, with the intrinsic characteristics of a concrete measured with the BT RHEOM, we try to simulate a practical problem: the pumping of fresh concrete. We show also another application of this rheometer: the mix-design of a high-performance concrete.
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https://pastel.archives-ouvertes.fr/tel-00523283
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1995TH_HU_C_NS18476.pdf
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  • HAL Id : tel-00523283, version 1

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Chong Hu. Rhéologie des bétons fluides. Mécanique [physics.med-ph]. Ecole Nationale des Ponts et Chaussées, 1995. Français. ⟨tel-00523283⟩

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