Analysis of influencing factors on rutting resistance of stone matrix asphalt mixtures

Rutting deformation not only shortens the service life of asphalt pavement, but also brings great risks to the drivers. The rutting resistance of Stone Matrix Asphalt (SMA) is affected by many factors. This study aimed to thoroughly discuss the main factors of rutting resistance and establish a dynamic stability prediction model based on experimental data from Marshall testing and wheel tracking test of SMA mixtures. The results showed that the optimal dosage of bitumen in rutting test was 0.1 similar to 0.3% more than that in Marshall testing for SMA mixtures. With 0.5 degrees C increase in temperature, dynamic stability of SMA mixtures decreased by an average of 18.6%. Also, greater amounts of aggregate and mineral powder did not lead to better rutting resistance of SMA mixtures. With too much or too little compaction work, the rutting resistance of SMA mixtures was reduced. There was a positive correlation between dynamic stability of SMA mixtures and fractal dimension, relative coefficient, and asphalt content, while the correlation between dynamic stability of SMA mixtures and rolling times as well as testing temperature was negative. (C) 2020 Sharif University of Technology. All rights reserved.