AN EMPIRICAL STUDY OF THE ROAD SURFACE MANAGEMENT CRITERIA FOR POROUS ASPHALT PAVEMENT OF EXPRESSWAY

摘要

In recent years, expressway companies have adopted porous asphalt pavement in the surfacelayer of the pavement. As a result, with the conventional management criteria made for dense graded asphaltpavement, it is impossible to fully grasp the states of the pavement surface. In this study, the authors examinethe validity of the current road surface management criteria and optimal road surface management criteria interms of evaluation length and evaluation index. Firstly, the authors describe the deviation problem of resultsof the road surface condition survey and judgment of necessity for repair in practice. At that time, referringto the difference in the deterioration process between porous asphalt pavement and dense graded asphaltpavement, the authors point out the problems of the current road surface management criteria. In addition,the authors carry out empirical analysis that is based on the road surface condition survey data acquired fromthe expressway during service and study the optimal road surface management criteria. The analysisindicates that evaluation length should be shortened and the main evaluation index should be shifted toInternational Roughness Index from crack rate.