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Modélisation du comportement thermo-viscoplastique des enrobés bitumineux

Abstract : The thesis has been realized within the framework of a partnership between the Cerema (Center for Studies and Expertise on Risks, Environment, Mobility, and Urban and Country Planning) and the ENTPE (National School for Public State Works). This work deals with the study and the simulation of the behavior of bituminous mixtures, in the domains of small and large amplitudes of solicitations. These domains correspond to the viscoelastic and viscoplastic behavior.First a bibliographical review on mechanical properties of the bituminous mixtures under small and large amplitudes of solicitations and a review of the several models describing the viscoelastic and viscoplastic behavior of bituminous mixtures is presented. This thesis is then composed of 5 main chapters.The two first deals with the development of the DBN model and mainly with the introduction of its new version EPPI (Elastic Perfectly Plastic and Isotropic). This formulation aims at describing the viscoelastic and viscoplastic behaviors together in a unique formalism, but simple enough to be implemented in a finite elements calculation program. This version of the DBN model is then implemented in a homogeneous computation code so as to be able to simulate classical experimental test.The two following chapter are devoted to the experimental campaign made during this research work. First a global description of the experimental procedures and test conditions is presented. Two kinds of tests are performed: complex modulus tests so as to characterize the viscoelastic behavior and simple traction tests for viscoplastic behavior. Finally results and observations issued from this campaign are detailed and some conclusions can be drawn.Finally the last chapter deals with the simulations performed thanks to the DBNEPPI model. These results aim at verifying the validity of the model introduced. Then a study about the transient effects during complex modulus tests on bituminous mixtures is detailed.
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Submitted on : Monday, May 20, 2019 - 12:48:32 PM
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Pierre Gayte. Modélisation du comportement thermo-viscoplastique des enrobés bitumineux. Génie civil. Université de Lyon, 2016. Français. ⟨NNT : 2016LYSET008⟩. ⟨tel-02134154⟩

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