Modified asphalt and preparation process thereof

Abstract

The invention discloses modified asphalt which is prepared from, by weight, 6-10 parts of modified asphalt activating agents and 90-94 parts of petroleum asphalt. The modified asphalt activating agents comprise, by weight, 75-89 parts of rubber heavy oil, 3-7 parts of modified carbon black, 3-7 parts of catalysts, 2-6 parts of activating agents and 3-5 parts of surface activating agents. The invention further provides a preparation process of the modified asphalt. The preparation process includes the steps: blending and stirring the rubber heavy oil, the modified carbon black and the catalysts; adding the activating agents to react mixture for 10 hours; adding the surface activating agents, and stirring mixture to obtain modified asphalt activating agents; stirring the modified asphalt activating agents and the petroleum asphalt; heating mixture to reach the temperature of 160 DEG C-195 DEG C in a stirring manner to obtain the modified asphalt. Compared with the prior art, the preparation process avoids that waste rubber powder is desulfurized to modify the asphalt in the prior art, the process conditions are easily achieved, the process is nontoxic and free from corrosion and pollution, and a pavement laid by the modified asphalt has good durability and abrasion resistance and the advantages that the pavement cannot soften at high temperature or crack at low temperature and ishigh in bearing capacity, free from flying dust, resistant to sliding and noise and the like.

Description

technical field [0001] The invention relates to the technical field of road asphalt, in particular to a modified asphalt and a preparation process thereof. Background technique [0002] Asphalt is a kind of binder used in flexible pavement construction. It has good cohesiveness, impermeability, insulation and chemical stability, and is an indispensable material in road construction. The quality of road asphalt is often evaluated by the following indicators: elongation, softening point and penetration. Elongation refers to the length from both ends of the tensile standard specimen to fracture under the specified tensile speed and temperature. The degree of softening can be measured according to ASTMD113 or GB / T4508; the softening point is the isoviscosity temperature of asphalt under certain conditions. ASTMD36 or GB / T4508; the penetration is the consistency index of asphalt, which reflects the softness and hardness of the asphalt under certain conditions. The penetration o...

AI Technical Summary

Problems solved by technology

[0003] Ordinary asphalt pavement is easy to be brittle at low temperature, easy to soften at high temperature, and prone to rutting, shifting, bagging and other phenomena under the repeated action of driving load, which seriously affects the service life of the pavement, so it must be modified. Improve its mechanical properties at high and low temperatures

The existing asphalt is modified by adding waste rubber powder. Due to the poor compatibility between waste rubber powder and other materials, it needs to be desulfurized to restore the adhesive properties of raw rubber to achieve compatibility with other materials. However, the desulfurization process is complicated and the environment Pollution is heavy, but also consumes energy, very uneconomical