The Study Of Rut Causes Of Steep Asphalt Concrete Pavement And Countermeasures

Due to the complex landform, physiognomy and engineering geology, it makes much more difficult of route selection of the freeway in the mountain areas. Complex and variable climate conditions of the mountain areas affect the use of the freeway and the traffic safety a lot. And because of the landform and physiognomy, there are many long and steep longitudinal slope in the mountain freeway, and this causes driving difficulties, then the speed drop off, the sheer stress and load time on the road surface increases, and what's worse, most of the traveling vehicles in the mountain areas are overloaded. And all of these factors require higher anti-rut capability of the freeway asphalt pavement in these areas.The subject we studied is based on the research results from domestic and overseas. Combining with the domestic actual conditions, we choose the steep asphalt pavement of one of the freeway in Guangdong to further analyze the rut causes on the asphalt pavement and work out the countermeasures. We made guideposts after testing and verifying the countermeasures to the specific project case and the test of our country's current anti-rut technical index. The main contents include the following:1. Find out the main reasons that caused the rut on the asphalt pavement in Guangdong province by analyzing the rut causes on one of the freeway of Guangdong.2. Make the countermeasures of avoiding ruts on the asphalt pavement through the tests and structural analysis of the bituminous mixture with different mix proportion of kinds of asphalt and road stone.3. After making contrastive analysis of the operation quality of the asphalt pavement before and after the maintenance, we discussed the countermeasures and announcements in construction, and it further proved the superiority of the anti-rut capability of the mastic asphalt (SMA).4. We analyzed the roundedness and accuracy of the anti-rut technical index of the bituminous mixture in the current specifications and made some modification proposals after analyzing substantive findings of rut tests combined with the distinguishing feature of the specific project of Guangdong.