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...