Linear viscoelastic characterization of bituminous mixtures from dynamic tests back analysis

Abstract : Characterizing the behaviour of bituminous materials is essential for the design of pavement structures and to predict their service life more accurately. Indeed, these materials are subjected to complex phenomenon, mechanical, thermal, physical and chemical that are often coupled. Due to the complexity of the phenomenon observed and with the emergence of new materials and new production techniques, advances laboratories studies and rheological modelling are necessary. With the existing methods, it is possible to characterize the materials in laboratories using expensive hydraulic presses. Moreover, most of these tests cannot be used directly on pavement structures. In this thesis, a dynamic test based on wave propagation was developed to characterize bituminous mixtures in the linear viscoelastic domain. It is a nondestructive test, far less expensive than the existing tests and that could be adapted for in situ measurements. Complex methods of inverse analysis of wave propagation in a viscoelastic medium were developed to obtain the thermomechanical properties of bituminous mixtures from the signals measured experimentally. The linear viscoelastic properties of different mixtures obtained from the developed dynamic test were compared to the results of more conventional cyclic tension-compression tests.
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Submitted on : Tuesday, September 24, 2019 - 12:34:29 PM
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Jean-Claude Carret. Linear viscoelastic characterization of bituminous mixtures from dynamic tests back analysis. Mechanics of materials [physics.class-ph]. Université de Lyon, 2018. English. ⟨NNT : 2018LYSET012⟩. ⟨tel-02170515v2⟩

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