Study on the warm-recycled mechanism of SMA and the road performance

In order to evaluate the performance of warm-recycled asphalt mixture with SMA, based on analyzing the characteristics of gradation, aggregate and aging asphalt with reclaimed asphalt pavement (RAP), The regeneration methods of high grade soft asphalt mixed at low temperature and hard natural asphalt remixed with modification to enhance are proposed, and it was used to prepare recycled asphalt mixture with SMA and different RAP contents(0, 10%, 20%, 30%). And its high temperature performance, water stability, low temperature performance and fatigue performance were comprehensively evaluated. The result showed that soft and rock compound regeneration technology is feasibility, the natural asphalt with strong polar functional groups was modified and strengthened by remixing to improve the comprehensive performance of asphalt; the performance of warm mix recycled mixture with the 7:3 ratio of 110 # asphalt matrix and TLA lake asphalt is better; the best dosage of RAP is 20%; compared with HMA and SBS modified asphalt mixture, temperature can reduce 15°C and 30°C to 35°C respectively.