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鋼床版舗装の縦亀裂に対して首都圏の最低気温付近でも生じるぜい性破壊現象に着目し各種混合物のぜい化点付近における引張破壊性状を検討したこの結果骨材粒度やアスファルトの種類によって混合物の破壊性状が異なるため載荷条件荷重・速度が同じ場合でも縦亀裂の発生状況が変化することがわかったそこでぜい性領域における縦亀裂の判定法として混合物の引張破壊ひずみやぜい化点に基づき舗装表面の発生ひずみを数値的に評価する方法を提案する本手法は長期フィールド試験でも良好な結果を得ているまた新しい混合物や種々の構造形式でも縦亀裂の判定を容易に行うことができるためこれまでになかったぜい性領域における舗装破壊の定量的評価が一般的に可能となるThis paper pays attention to brittle fracture phenomenon at low temperature to investigate the cause of longitudinal surface cracking of asphalt pavement on steel deck bridges, and examined fractue properties around the brittle point of asphalt mixtures with tensile tests and FEM analysis. The results revealed that the asphalt mixtures considered in this study have different fracture properties and a certain mixture possibly fracrures under a pareticular loading and temperature condition where the other materials do not. Based on the brittle point and failure tensile strain, a method of numerically evaluating the possibility of occurrence of surface cracking on an asphalt mixture was developed, which can be easily applied to new types of asphalt materials and various types of bridge structures. This method was validated by long term field observation on an actual pavement on a steel deck. (It allows the geneal and quantitative evaluation of brittle pavement fracture, which has never been possible.

A STUDY ON TENSILE FRACTURE PROPERTIES AT LOW TEMPERATURE OF ASPHALT PAVEMENT ON STEEL DECK BRIDGES AND EVALUATION METHOD OF LONGITUDINAL CRACKING