Experimental study on performance of hot mixed epoxy gussasphalt mixture.

The gussasphalt mixture has excellent water tightness, coordinated deformation ability and durability, while the epoxy asphalt mixture has extremely outstanding strength and heavy load on high temperature resistance. In order to realize the integration of the advantages of the two mixtures, the epoxy gussas-phalt mixture is proposed. The mechanical properties and 170 °C viscosity tests of epoxy resin and hot mixed epoxy asphalt from three sources were carried out; based on the mix proportion design of hot mixed epoxy gussasphalt mixture, the fluidity, Marshall, penetration, rutting, bending and fatigue performance tests of the mixture with mixing time of 45 min and 135 min were carried out. The results show that the mechanical properties of the three epoxy resins and the hot mixed epoxy asphalt are basically the same, and the viscosity is up to 1 Pa ⋅ s at 170 °C for more than 3 h; the performance of mixture attenuates greatly with the increase of mixing time; the type of epoxy asphalt has no significant effect on the performance indexes except flow value and ultimate flexural strain. When mixing for 45 min, the performance of XB epoxy gussasphalt mixture is the best, the fluidity is less than 5 s, and the constructability fluidity maintenance time is more than 135 min. The Marshall stability exceeds 48 kN, the rutting dynamic stability reaches 18 945 times/mm, the penetration increment is only 0.1 mm, and the ultimate flexural strain at - 10 °C exceeds 3 000 µε. The impact toughness of fatigue performance index reached 3 517 N ⋅ mm, and its performance was far higher than that of conventional gussasphalt mixture, and many indexes were also higher than that of epoxy asphalt mixture, and the cost is also relatively low. The hot mixed epoxy gussasphalt mixture has the advantages of both the gussasphalt mixture and the hot mixed epoxy asphalt, which can effectively improve the high-temperature strength of the gussasphalt mixture, and is of great significance to improve the quality and durability of steel bridge pavement in China. [ABSTRACT FROM AUTHOR]