ABSTRACT
ABSTRACT: The paper deals with the evolving behaviour of asphalt mixture on steel plate. Due to the softness of such a support and the mechanical loads involved, the asphalt pavement is subjected to considerable strain that may generate top-down cracks. The five-point bending fatigue test is the standard device in France for asphalt concrete used on steel orthotropic deck bridges to perform the best asphalt mixture having a strong resistance to cracking. Displacement sensors detect the initiation of cracks where they are most likely to appear. Significant strain increases and decreases are observed when cracks are created. Moreover, a non-destructive measurement technique based on ultrasonic measurements has been developed. From velocities and amplitudes of waves and under the assumption of linear viscoelasticity, complex modulus M* and the time dependent evolution of damage are followed up. Results from displacement sensors and wave propagation are compared and provide good perspectives. Numerical simulations will also be presented.
