Determination of Compaction Temperature and Research on Pavement Performance of WMA Based on Bulk Density

Abstract

Choosing two common warm mix modifiers (EC120 and Sasobit), adopting bulk density as the index to measure the effect of compaction, taking the temperature corresponding to the maximum density as optimum temperature, the asphalt mixture sample is formed under this temperature, and the road performance of warm mix asphalt is studied through immersion Marshall test, freeze-thaw split test, rutting test, bending and fatigue tests. The experimental result shows that (1) both modifiers can improve asphalt’s high temperature performance, deformation resistance, and temperature sensitivity, while the low temperature performance of the asphalt is decreased a little; (2) water stability, high temperature stability, and fatigue resistance of the warm mix asphalt are all better than that of hot mix asphalt, whereas the low temperature crack resistance is mildly worse than that of hot mix asphalt. The paving of the experimental road proved to be better when the warm mix asphalt was used.