论文部分内容阅读
The fatigue characteristics of asphalt have been studied for many years.But there is not a unique evaluation index for asphalt fatigue.After the healing phenomenon was noticed,it indicates that it is essential to study the fatigue characteristic of asphalt considering rest periods.In this research,the fatigue characteristics of asphalt under continuous load and the healing ability of asphalt have been studied.And the advantages and disadvantages of different fatigue indexes were analyzed.The results show that the fatigue performance of asphalt descends with the loading increasing.When the loading is bigger,the modulus decreases with the times of loading increasing,and when the loading is smaller,there is hardening phenomenon.The indexes (50％G * 、DER、DR、δ) has some relationship between each other,but all of them have some deficiency in evaluating the fatigue characteristic of asphalt.The problem is the definition of the failure point is not suitable.The healing characteristic has an important performance on the fatigue characteristic of asphalt.The healing rate at the initial period after stopping loading is bigger than later.With time increasing,the characteristic of asphalt after rest is getting closer to the characteristic before rest.