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Déformations instantanées et différées des bétons à hautes performances

Abstract : This thesis proposes two types of modelling, together with a long series of experimental data, for the instantaneous and time-dependent strains of high performance concrete. The first model deals with instantaneous, autogenous shrinkage and basic creep deformations of high performance concrete with respect to mix-design parameters. To this end, a homogenization approach based on Hashin's spheres model for the modulus, is adopted and modified to take into account the effective maximum packing density of the aggregates. This leads to a three-sphere model. After justification, the Poisson's ratio of each phase is set at a constant value of 0,2. This model is consequently applied to calculate the long-term amplitude of autogenous shrinkage and basic creep. The creep results obtained are compared with visco-elastic calculation, which allows the adopted approach to be confirm. The main mix-design parameters are taken into account (water/cement ratio, silica fume/cement ratio, aggregate concentration, maximum packing density of the agrégate, cement strength). The second research part deals with a simplified model for design code purposes. It allows the calculation of high performance concrete strains as a function of time, and a limited number of parameters. In particular It accounts for the self-dessication, the maturity and the strength of the concrete at the loading time. This model was validated against extensive experimental data, covering the marurity range from sixteen hours to two years. The model was established within the framework of the French Structures and Materials Research Association (AFREM), and is proposed in addition to the French Prestressed Concrete French Code (BPEL), for concrete covering the strength range from 40 to 80 Mega-Pascals.
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  • HAL Id : tel-00529739, version 1

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Robert Le Roy. Déformations instantanées et différées des bétons à hautes performances. Mécanique [physics.med-ph]. Ecole Nationale des Ponts et Chaussées, 1995. Français. ⟨tel-00529739⟩

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