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Etude de la fissuration au jeune âge des structures massives en béton : influence de la vitesse de refroidissement, des reprises de bétonnage et des armatures

Abstract : At early-age, massive concrete structures (ex. nuclear power plant) are submitted to strains due to the hydration reaction. If they are restrained, crossing cracks can occurs. This cracking may increase significantly the concrete wall permeability. The objectives of this work was to characterize the early age concrete behavior (thermal and endogenous shrinkage, basic and thermal transient creep, mechanical characteristic evolution) as well as develop a new device to study the early age cracking of a concrete structure submitted to restrained shrinkage.The experimental campaign achieved with this new device (called thermal active ring test) and the numerical analysis of the test thanks to finite element simulations allows us to evaluate the coupling betwwen creep and damage, to identify the tensile strength decrease due to construction joints and to quantify the effect of reinforcement on the concrete behaviour. Moreover, with this device, permeability measurements have been performed on a cracked specimen. Finally, numerical simulations of massive structures highlight the influence of boundary conditions for restrained shrinkage and the influence of the coupling between creep and damage on the damage pattern.
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Submitted on : Wednesday, June 8, 2011 - 4:33:13 PM
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  • HAL Id : tel-00597072, version 2

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Matthieu Briffaut. Etude de la fissuration au jeune âge des structures massives en béton : influence de la vitesse de refroidissement, des reprises de bétonnage et des armatures. Autre. École normale supérieure de Cachan - ENS Cachan, 2010. Français. ⟨NNT : 2010DENS0030⟩. ⟨tel-00597072v2⟩

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