EFFECTIVENESS OF EARLY REHABILITATION OF PAVEMENT AND PROPOSAL ON MANAGEMENT METHODS FOR THE BEARING CAPACITY OF ASPHALT CONCRETE LAYERS

Abstract

 In Japan, expressway pavement repairs have shown a deepening of damaged layers and shortening of repair cycles due to aging and the application of porous asphalt to the surface layer. Therefore, the concept of preventive maintenance—repairing before damage worsens—is important. In this paper, analyses were conducted using repair history and pavement condition data from the Pavement Management System (PMS) to examine preventive maintenance strategies. First, we analyzed the effectiveness of early repairs by investigating the relationship between the timing of the first repair and the service life of repair layers in a section of an expressway. Next, to evaluate the bearing capacity of the asphalt concrete layer, we improved an FWD prediction model based on machine learning to supplement deflection measurements from FWD testing. Furthermore, we analyzed temporal changes in bearing capacity using the prediction model and proposed a management method for the bearing capacity of the asphalt concrete layer based on a case study of sections with repeated repairs.