Evaluation of the mechanical response of bituminous pavement surface layer with and without tack coat
Résumé
Pavement surface layers are submitted to severe loading conditions, as they are directly in contact with tire loads, and present different types of damage: top down cracking, rutting, surface polishing. The purpose of this paper is to analyse the strain distribution at the interface between two asphalt layers and to quantify the influence of its viscoelasticity on the stresses and strains in the asphalt layers, in order to understand their damage mechanisms. The pavement response is evaluated by a full-scale pavement test, and modelled using the Viscoroute software. Three models are compared : (1) linear elastic (2) viscoelastic with bonded interface and (3) viscoelastic with a viscoelastic interface. The measurements and the modelling results indicate that the interface bonding condition has a strong influence on the mechanical behavior of the surface layer and on its damage mechanisms.
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