Abstract: A rubber asphalt and a preparation method thereof are disclosed. The rubber asphalt comprises matrix asphalt and rubber powder modifier in a ratio of 4:1-4, wherein the rubber powder modifier comprises waste tire rubber powder and hexanediol in a ratio of 94-96:6-4. The method comprises the following steps: mixing the hexanediol with the waste tire rubber powder according to the ratio and stirring and wetting to obtain the rubber powder modifier; placing the matrix asphalt into a reaction kettle and heating to 90-170° C.; adding the rubber powder modifier into the reaction kettle according to the ratio; and raising the temperature to 190-210° C. under the stirring state to obtain the rubber asphalt. The rubber asphalt has an extensibility of 13-19 cm at 5° C., a penetration of 68-75 at 25° C. and a softening point of 53-90° C. The asphalt-aggregate ratio of a mixed material on the subsequent work section can be reduced to 6-8 from 8-10.

Abstract: A rubber asphalt and a preparation method thereof are disclosed. The rubber asphalt comprises matrix asphalt and rubber powder modifier in a ratio of 4:1-4, wherein the rubber powder modifier comprises waste tyre rubber powder and hexanediol in a ratio of 94-96:6-4. The method comprises the following steps: mixing the hexanediol with the waste tyre rubber powder according to the ratio and stirring and wetting to obtain the rubber powder modifier; placing the matrix asphalt into a reaction kettle and heating to 90-170° C.; adding the rubber powder modifier into the reaction kettle according to the ratio; and raising the temperature to 190-210° C. under the stirring state to obtain the rubber asphalt. The rubber asphalt has an extensibility of 13-19 cm at 5° C., a penetration of 68-75 at 25° C. and a softening point of 53-90° C. The asphalt -aggregate ratio of a mixed material on the subsequent work section can be reduced to 6-8 from 8-10.