High-temperature rheological properties of waterborne epoxy asphalt emulsion mastic

In this study, Portland cement and limestone dust were added as mineral filler to anionic and cationic waterborne epoxy asphalt emulsion (WEA), respectively, and four types of waterborne epoxy asphalt emulsion mastics were prepared. A filler-WEA (F/WEA) ratio of each WEA mastic refers to the weight ratio of filler and WEA, ranging from 0.3 to 1.2 at 0.3 increments. Four WEA mastics with different F/WEA ratios were subjected to temperature sweep test, frequency sweep test, and multiple stress creep and recovery test by using a dynamic shear rheometer, and the rheological parameters (e.g., Superpave rutting parameter, non-recoverable creep compliance) were obtained. The results show that WEA-cement mastics, especially anionic mastics, had excellent high temperature deformation resistance due to the existence of waterborne epoxy-cured products and cement hydration products in the mastics system. In contrast, non-chemical interaction between limestone dust and WEA resulted in a slight improvement in the high-temperature performance of WEA-limestone mastics. In addition, the rheological parameters of four WEA mastics all exhibited significant correlations with F/WEA ratio. The F/ WEA ratio had more effect on the rheological properties of WEA-limestone mastics than that of WEA-cement mastics.