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Fissuration des mortiers en couches minces - Effet de l'hydratation, du séchage et de la carbonatation

Abstract : The main objective of this thesis is to identify physical and chemical phenomena related to shrinkage at local scale in order to assess the risk of cracking of a thin layer of mortar. At macroscopic scale, the ring test is able to reproduce the thermo-hydro-mechanical conditions underwent by the mortar during his service life. Then, the different couplings could be identified. An experimental campaign on two industrial mortars allowed us to adapt and to validate the ring test for thin layers. Furthermore, a simple computational tool is proposed in order to assess the non-linear strains induced during the test (creep, micro-cracking). Moreover, the influence of mix design parameters, carbonation and time of demoulding on cracking was studied. A strong coupling between hydration and drying was identified. The last part of this work deals with the development of a finite element multi-scale model that predicts the evolution of hydraulic, physical and mechanical properties of the material. Through this model, a new representation of pore size distribution of mortar is proposed. It is based on a sum of three sub-distributions of porosity including that of inner and outer products and also capillaries. A hydroactivation law is also used to take into account the interaction between hydration and drying. The model is implemented in a finite element code called Castem2001.
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Submitted on : Monday, February 18, 2008 - 2:12:37 PM
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  • HAL Id : tel-00256911, version 1

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Joachim Monge. Fissuration des mortiers en couches minces - Effet de l'hydratation, du séchage et de la carbonatation. Sciences de l'ingénieur [physics]. École normale supérieure de Cachan - ENS Cachan, 2007. Français. ⟨tel-00256911⟩

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