A kind of asphalt mixture modifier and preparation method thereof

Abstract

The invention discloses an asphalt mixture modifier and a preparation method thereof. The modifier comprises, by mass percentage, 60%-91% of sulfur, 4%-10% of EVA (ethylene-vinyl acetate), 1%-10% of polyethylene wax, 1%-15% of LDPE (low-density polyethylene), and 1%-5% of a hydroxide. The preparation method comprises: mixing sulfur, an ethylene-vinyl acetate copolymer, polyethylene wax, low density linear polyethylene and the hydroxide evenly, conveying the mixture into an extruder to conduct extrusion and granulation, thus obtaining the modifier. The preparation process of the modifier provided by the invention generates little irritating smell. Adding of the modifier provided by the invention into an asphalt mixture can effectively improve the anti-rutting performance of asphalt pavement, and improve the anti-water damage performance. Also, the low temperature performance is taken into account, and the modifier has good compatibility with asphalt.

Description

technical field [0001] The invention relates to a modifier for asphalt mixture, in particular to a modifier for improving the anti-rutting and water damage performance of asphalt mixture, its preparation method and application. Background technique [0002] Due to the increasing number of vehicles in our country and the heavy load of transportation, the phenomenon of rutting and wrapping on asphalt pavement is becoming more and more serious, especially in the hot areas in southern my country. In addition, in areas with a lot of rain in the south of my country or along the coast, water damage to asphalt pavement caused by stone falling off due to rainwater penetrating into the asphalt mixture surface layer or even the base layer is also more prominent. These two phenomena have become the main damage forms of asphalt roads in our country, seriously affecting the driving safety, service level and service life of asphalt roads. [0003] As early as 1900, people began to use sul...

AI Technical Summary

Problems solved by technology

The above two patents also need to heat and melt sulfur into a liquid state. The operating temperature is high, which will produce a strong pungent smell, which is not conducive to the environment and human health.

It can only improve the high-temperature performance of the asphalt mixture. The low-temperature cracking resistance and water damage resistance of the mixture still need to be improved, and the sulfur particles formed are also relatively brittle and easily broken during transportation and loading and unloading. Due to the friction between the particles, It will also produce more dust, which not only pollutes the environment, but also easily inhales the staff, endangering health.