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Analyse sur structures modèles des effets mécaniques de la réaction sulfatique interne du béton

Abstract : Delayed Ettringite Formation (DEF) is a reaction that can affect concretes exposed to temperatures higher than 65°C. The corresponding formation of ettringite in the hardened material leads to swellings, cracking and decrease of the mechanical properties. Thus it gives serious concern in terms of structural integrity and serviceability. DEF is often coupled with Alkali-Aggregate Reaction (AAR) in the field. For a structure manager, it is necessary to be able to diagnose the reaction, to assess the serviceability of the structure, to predict its evolution and to repair it. To reach these objectives, it is necessary to understand DEF effects both at the microscopic scale and the structure scale. In the literature, a lot of theoretical and experimental researches have been reported and deal mainly with the chemo-physical mechanisms. These results emphasize the complexity of the microscopic features of DEF and thus can hardly be used to model its structural effects. Thus, macroscopic approaches seem to be more adapted. To develop such approaches, it is necessary to understand the effect of the deleterious process at the scale of the material and of the structure. In this context, this research proposes to quantify the couplings between DEF-induced swellings and moisture, temperature and mechanical loadings thanks to material tests on concrete cylinders. The couplings between DEF and AAR are as well investigated. Moreover the monitoring of dimensions and water content of concrete beams is also performed while being exposed to various controlled water supply conditions. The corresponding results provide a database useful to analyse quantitatively the mechanical effects of DEF (for the material and for the structures) and to validate the numerical models by comparing their predictions to the experimental behaviour
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Renaud-Pierre Martin. Analyse sur structures modèles des effets mécaniques de la réaction sulfatique interne du béton. Autre. Université Paris-Est, 2010. Français. ⟨NNT : 2010PEST1076⟩. ⟨tel-00558200v2⟩

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