The invention belongs to the technical field of road and bridge materials, and relates to an
epoxy asphalt additive for road and bridge pavement as well as a preparation method and a use method thereof. The technical key points are as follows: the water-damage-resistant
asphalt mixture comprises the following components in parts by weight: 40-60 parts of
solid epoxy resin, 5-20 parts of a water-damage-resistant improver, 5-10 parts of an ultra-high molecular weight
epoxy flexibilizer, 30-45 parts of a latent
polyester curing agent, 50-100 parts of hard
asphalt particles, 0.1-0.5 part of a curing accelerator, 0.3-1 part of a lubricating separant and 0.5-2 parts of an
antioxidant. The epoxy asphalt additive is prepared under the condition of 110 to 140 DEG C. The
softening points of the main raw materials such as the resin component, the curing agent, the hard asphalt particles and the like in the epoxy asphalt additive are controlled within the range of 90-130 DEG C, and the epoxy asphalt additive for road and bridge pavement is prepared by adopting a 110-140 DEG C
melt extrusion process. And then directly putting the mixture into a mixing cylinder of an asphalt mixing
plant to prepare the high-performance epoxy
asphalt concrete with high-temperature
rut resistance, low-temperature
crack resistance and medium-temperature
fatigue resistance.