Research on Fiber Micro-Surfacing Mixture Design and Pavement Performance in Interchange`s Connections

ratio, Cold bending test. Abstract: Now a large number of expressway enter the stage of repair and maintenance. But its easy to overlook the pavements performance, especially the skid resistance of the interchange at ramp exit and entrance during the repair and maintenance Interchange ramp exit and entrance has always been the accident-prone sections. A lot of screeching halts happened in those sections which significantly reduce the pavement skid resistance and Micro-surfacing can significantly improve the performance of pavement. So its meaningful that using the micro-surfacing to improve the performance of the pavement in the areas o f the ramp exit and entrance, and especially the skid resistance of the pavement. But the existing micro-surfacing technology guide has some technical defects, which impede the application and development of micro-surfacing technology. In this paper, firstly the "graphical method" is used to determine the optimal dosage range of emulsified asphalt. Verified with laboratory tests, recommending the dosage of emulsified asphalt corresponding to the peak of flexural strain measured with low temperature bend tes t as OAC of micro-surfacing mixture showed superiority technically.