Research on performance of direct coal liquefaction residue modified asphalt mortar

In order to study the performance of DCLR (direct coal liquefaction residue) modified asphalt mortar, different DCLR modified asphalt mortar with different DCLR contents and filler-asphalt ratios (FA) was prepared. The high-and-low temperature and fatigue performance of asphalt mortar was analyzed by a dynamic shear rheometer and a bending beam rheometer. Using the variance analysis method the influence of the single factor (temperature, DCLR content, FA) and the coupling between these factors on the performance of asphalt mortar was investigated. The results show that the addition of DCLR and filler can significantly improve the high-temperature performance of asphalt mortar, but damage the low-temperature performance and the fatigue performance of asphalt mortar. To comprehensively balance the effects of DCLR content and FA on the performance of the mortar, the DCLR content of 10% and the FA of 1.0 are recommended. Besides, the single factor (temperature, DCLR content, FA) and the coupling between these factors have significant effects on the performance of asphalt mortar, but the effect of the coupling is smaller than that of the single factor.