Wear behavior analysis and study on skid resistance on SMA pavement

In this paper asphalt plates are made with the same grading curve of SMA but different aggregate types. The asphalt plates were polished with real tires by the Aachen polish machine, which was constructed by the Institute of Road and Traffic Engineering Aachen. The surface was observed by stereo microscope and the friction value was measured with SRT and PWS after each stage of polishing. The result showed that aggregates and bitumen have different contributions to the skid resistance depending mainly on the sliding speed. Especially the bitumen is conducive to skid resistance of the SRT, but not conducive to skid resistance of the PWS, which was measured at 100 km/h. The adhesion between aggregates and bitumen and polishing particle are crucial for the skid resistance of SMA pavement.