A STUDY ON MECHANICAL EFFECTS OF INTERLAYER DEBONDING ON INTERNAL STRESS AND DEFLECTION OF ASPHALT PAVEMENT

Abstract

 In recent years, interlayer debonding in asphalt mixtures has been observed in asphalt pavements with early deterioration, and its countermeasures are required. However, it is not clear how interlayer debonding affects pavement deterioration. In this study, we have calculated the stresses inside the pavement by multi-layer elastic analysis in the case of interlayer debonding, and have shown that damage can occur that is not taken into account in conventional pavement design. We have also focused on the deflection of FWD, which is used in many pavement investigations as a non-destructive method to diagnose the pavement structure, and have shown the change in the amount of deflection and the error in the inverse analysis caused by the conventional method in the case of interlayer debonding. Furthermore, we have shown that this error can be corrected by taking into account the interlayer debonding, and have verified the validity with FWD data obtained on the actual road.