Study On Warm Mix Asphalt Thin Overlay Of Highway Asphalt Pavement

With the asphalt pavement continuous completed and put into use, and under the influence of factors such as environmental factors, climatic conditions, structural design, traffic volume, vehicle overloading, the asphalt pavement have lots of early diseases, how to take the economic, efficient and reasonable maintenance methods to reduce the occurrence of various types of disease, restore function of the road structure, extend the road life of asphalt pavement is a major problem. This article depends on the project of Yunnan Education Committee science and technology, which name was"the new technology research of Expressway Asphalt Pavement Seal in Yunnan", and begin its systematic research on the maintenance technologies of asphalt pavement by paved thin overlay of the warm mix asphalt of SMA.The author, after studying on related research achievement both in and abroad, ascertained the best content of Sasowam viscosity depressants and the mixing and compaction temperatures of warm mix asphalt, by studying on the normal performance index and viscosity-temperature characteristics of modified asphalt which added different content of viscosity depressants. At the same time, comparative studied on the Pavement performance such as the high temperature stability,the performance to resist the crack in low temperature and water stability between the warm mix asphalt of SMA-10 and the SBS modified asphalt of SMA-10 on the condition of bitumen aggregate ratio, it shows that the Pavement performance of warm mix asphalt is worse than the SBS modified asphalt mixture, but both met the requirements of the Technical code for construction and acceptance of highway asphalt pavement. The author comparative studied on the fiber-reinforced stress-absorbing membrane interlayer, the rubber asphalt stress-absorbing membrane interlayer and the bonding coat of polymer modified emulsion asphalt by laboratory experiment, and evaluated the operational performance of the stress-absorbing membrane interlayer by index of shear strength and bond strength, and ascertained the fatigue equation all of the stress-absorbing membrane interlayer by fatigue test.At last, practiced on-site paving after experimental design, it seems to be that the paving effection is very good.