Experimental Study on Macrotexture of Asphalt Pavement

In order to better understand the evolution of the road-surface macro-texture, kneading test was conducted by using a kneading machine. The kneading machine was invented by improving a national standard rutting machine. Ten specimens were studied, which have different values in various factors (kneading temperature, aggregate gradation and aggregate type). Macrotexture measurements were carried out at different kneading times (0 hour, 2 hours, 4 hours, 6 hours, and 8 hours). The macro-texture profiles were measured by means of the Laser-measuring Technique, showing on an area of 10cmx10cm. Two indicators, the Peak Angle and the Kneading Loss, were adopted to describe and quantify the evolution of the macro-texture. The results showed that aggregate gradation, kneading time and kneading temperature can significantly impact the skid resistance performance of asphalt pavements; Kneading will affect the distribution of Peak Angles and increase the Kneading Loss.