Composite modified asphalt for high-grade high road and preparation thereof

Abstract

The invention relates to composite modified pitch used for high-grade highways and a preparation method thereof. The technical proposal is as follows: firstly, 10-45 weight percent of concocted coal pitch and 55-90 weight percent of petroleum pitch are mixed uniformly by a colloid mill to be heated up to 120-220 DEG C; 1-10 weight percent of the above mixed material of styrene-butadiene-styrene block copolymer and 0.1-0.3 weight percent of stabilizing agent are added to be mixed for 0.5 to 2 hours at the temperature as above; and then the materials are stirred and kept warm in a development tank for 2 to 8 hours and then are placed in a storage tank. The concocted coal pitch is prepared by the step as follows: 40-70 weight percent of mesothermal coal pitch and 30-60 weight percent of coaltar or coal tar distillation cut or 85-95 weight percent of the mesothermal coal pitch and 5-15 weight percent of phenolic resin are added into a reactor to be mixed for 0.5 to 3 hours at 100-160 DEGC. the invention has low cost and simple technology, and a product has the characteristics of unlikely crack at low temperature, uneasy softening at high temperature, good elasticity, high strength and long service life.

Description

1. Technical field [0001] The invention belongs to the technical field of petroleum asphalt. In particular, it relates to a composite modified asphalt for high-grade roads and a preparation method thereof. 2. Background technology [0002] With the rapid development of transportation, convenient and fast road transportation is taking on more and more transportation volume, which directly leads to a substantial increase in the load of vehicles on the road, increased vehicle speed, and increased driving frequency. Requirements, especially the need for a large number of high-grade road pavement. However, the pavement of high-grade highways needs to pay more attention to the rutting resistance, shear deformation resistance and durability of pavement materials. [0003] At present, domestic research on modified asphalt mainly uses petroleum asphalt as the base material to add polymers for modification to make modified petroleum asphalt. Simply relying on the quality of modifie...

AI Technical Summary

Problems solved by technology

At present, most of the road asphalt produced in China has the disadvantages of being brittle at low temperature, easy to soften at high temperature, poor elasticity and short service life. It can no longer meet the performance requirements of modern high-grade roads, and the service life of the road surface is short and maintenance is frequent.