Research on Multigrade Asphalt Cement (MAC) Application Based on Evotherm Warm-mixed Asphalt (EWMA) Technology

摘要

Multigrade Asphalt Cement (MAC) is a liquefied binder material by chemical method and is widely applied in the heavy traffic pavement. Its high construction temperature restricts its application in low temperature. The latest Evotherm product-EWMA was added into MAC to produce composite binder. Dense graded hot-mixed mixture AC-20 was selected as the studied aim and Marshall method was used when the mixture was designed. MAC added of different dosages EWMA (EWMA-MAC) was mixed with aggregate at 180 °C and compacted at different temperatures 155 °C, 140 °C, and 125 °C. The air voids of EWMA-MAC mixture with 0.7% EWMA compacted at 155°C and 140°C were very close to those of MAC mixture compacted at 170 °C. Water stability, high and low temperature properties of EWMA-MAC mixture with 0.7% EWMA compacted at 155°C, 140°C, and 125°C were measured and discussed. The field tested results show that EWMA technology can improve the workability of MAC mixture at low temperature and obtain good early pavement performances.