Abstract: The effects of WG-Ⅰ warm mix additive (WMA) on the performance of hydraulic asphalt and asphalt concrete are investigated. First of all, the effects of adding different dosages of WMA on three indicators(needle penetration, softening temperature, and ductility) and viscosity as well as density of No. 90 hydraulic asphalt are inspected, and the influence of WMA as of 4% dosage at different aging times on the performance of asphalt is also examined. Furthermore, Marshall specimens of asphalt concrete mixed with different dosages of WMA are prepared for splitting test to obtain a proper WMA content as 2%. Subsequently, the asphalt concrete specimens with 2% WMA are used for bending test, tensile test, and compression test. Ordinary asphalt concrete specimens are also tested for comparison. Research findings demonstrate that WG-1 WMA is conducive to reducing the viscosity of asphalt, and in the meantime enhancing the aforementioned three indicators. Asphalt concrete mixed with WMA is of good performances with strain capacity improving remarkably, favorable for asphalt’s ability of self-healing and adapting to deformation of asphalt. In conclusion, WG-1 WMA can be used as a warm mix material for hydraulic asphalt concrete in the purpose of saving cost, shortening construction period, and protecting environment.

Key words: WG-Ⅰ warm mix additive, asphalt concrete, viscosity, needle penetration, softening temperature, ductility, splitting test, performance test