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Evaluation du comportement mécanique sous sollicitations thermohydriques d'un mur multimatériaux (bois, terre crue, liants minéraux) lors de sa construction et de son utilisation

Abstract : Global climate problems push us to design energy-saving constructive systems. The use of walls made of eco-materials (wooden frame with a filling of brick of raw earth and assembled by mineral mortar) appears as an interesting alternative solution being in linewith the objectives in terms of sustainable development. In order to use a numerical simulation approach to this type of constructive system, a thermo-hydro-mechanical modeling tool was developed. On the one hand, it aims to predict the wall's ability to regulate the ambient hygrothermal conditions during day / night alternations according to the different ventilation assumptions and, on the other hand, to identify the various scenarios described in terms of temperature which can induce the appearance of cracks in the wall, both during construction and operating conditions. The originality of the work carried out on the properties of the raw earth make us able to develop a multidisciplinary experimental campaign to characterize the thermal, hydric and mechanical properties under different humidity conditions. These properties feed the numerical model with the necessary adaptations presented. The results present both the impact on hygrothermal comfort and to the effect of humidity changes on the mechanical durability of the wall.
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Lamyaa Laou. Evaluation du comportement mécanique sous sollicitations thermohydriques d'un mur multimatériaux (bois, terre crue, liants minéraux) lors de sa construction et de son utilisation. Matériaux composites et construction. Université de Limoges, 2017. Français. ⟨NNT : 2017LIMO0066⟩. ⟨tel-02459154⟩

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