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Couplage dégradation chimique - comportement en compression du béton

Abstract : This work is in the context of the long term behavior of concrete employed in radioactive waste disposal. The objective is to study the coupled chemo-mechanical modelling of concrete. In the first part of this contribution, experimental investigations are described
where the effects of the calcium leaching process of concrete on its mechanical properties are highlighted. An accelerated method has been chosen to perform this leaching process by using an ammonium nitrate solution. In the second part, we present a coupled phenomenological chemo-mechanical model that represents the degradation of concrete materials. On one hand, the chemical behavior is described by the simplified calcium leaching approach of cement paste and mortar. Then a homogenization approach using
the asymptotic development is presented to take into account the influence of the presence of aggregates in concrete. And on the other hand, the mechanical part of the modelling is given. Here continuum damage mechanics is used to describe the mechanical
degradation of concrete. The growth of inelastic strains observed during the mechanical tests is describes by means of a plastic-like model. The model is established on the basis of the thermodynamics of irreversible processes framework. The coupled nonlinear problem at hand is addressed within the context of the finite element method. Finally, numerical simulations are compared with the experimental results for validation.
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Submitted on : Friday, December 2, 2005 - 10:03:48 PM
Last modification on : Friday, October 23, 2020 - 4:52:01 PM
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  • HAL Id : tel-00011140, version 1



Viet-Hung Nguyen. Couplage dégradation chimique - comportement en compression du béton. Matériaux. Ecole des Ponts ParisTech, 2005. Français. ⟨tel-00011140⟩



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