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In recent years, expressway companies have adopted porous asphalt pavement in the surface layer of the pavement. As a result, with the conventional management criteria made for dense graded asphalt pavement, it is impossible to fully grasp the state of the pavement surface. In this study, the authors examine the adequacy of the current road surface management criteria and optimal road surface management criteria in terms of evaluation length and evaluation index. Firstly, the authors describe the deviation problem of results of the road surface condition survey and judgment of necessity for repair in practice. At that time, referring to the difference in the deterioration process between porous asphalt pavement and dense graded asphalt pavement, 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 from the expressway during service and study the optimal road surface management criteria. The analysis indicates that evaluation length should be shortened and the main evaluation index should be shifted to International Roughness Index from crack rate. 近年，高速道路では標準的な舗装路面として高機能舗装が採用されている．これに伴い，密粒舗装が主流であった時期に策定された従来の路面管理基準では，舗装路面の状態を十分に評価することが困難となってきている．本研究では，評価長と評価指標という観点から現在の路面管理基準の妥当性と，最適な路面管理基準について検討する．具体的には，現在の我が国の道路舗装の維持管理における，路面性状調査の結果による健全度評価と現場の補修要否判断の乖離の問題を説明する．その際，密粒舗装と高機能舗装それぞれの劣化過程の相違に触れ，評価長と評価指標という観点から現在の路面管理基準の問題点を指摘する．その上で，供用中の高速道路で獲得された路面性状データを用いた実証分析を実施し，最適な路面管理基準について検証する． |
