Characterization of bituminous layers interfaces: From the mechanical behaviour to the modelling

Even if, for composite materials, many experimental studies as well as behavior laws have been developed, evaluation of the behavior of interfaces between pavement layers is an actual scientific lock. The current French design method only takes into account interfaces, as conventional perfect bonding or slipping plane. In order to understand the behavior of the interface or interphase, the photomechanical tools are unavoidable. Global and local analysis, determined by two methods, includes tracking markers and Digital Images Correlation (DIC). The feasibility of this approach is presented for a direct tensile test on double-layered asphalt pavement specimen. The results (roughness, adhesion) will be input as parameters of a damage model interface.