Toughened asphalt modifier, toughened compound modified asphalt, asphalt mixture and preparation method thereof

Abstract

The invention provides a toughened asphalt modifier, toughened compound modified asphalt, an asphalt mixture and a preparation method thereof. The toughened asphalt modifier comprises 65 to 92 parts of desulphurized rubber tire powder, 0 to 20 parts of polyolefin plastic particles, 0 to 15 parts of SBS, 0 to 15 parts of SBR and 0 to 6 parts of a stabilizer. The toughened compound modified asphaltcomprises 60 to 85 parts of matrix asphalt, 15 to 40 parts of toughened asphalt modifier, 0 to 0.3 part of sulfur and 0 to 7 parts of light-weight oil component. The asphalt mixture comprises 100 parts of mineral aggregates and 5.0 to 6.0 parts of toughened compound modified asphalt. By adopting the toughened compound asphalt modifier, the problems of the rubber and plastic modified asphalt that the processing difficulty is high and the stability of the finished product is poor can be solved. When the asphalt mixture is used for forming the asphalt pavement, the asphalt mixture of the invention has high anti-cracking capacity and long pavement service life.

Description

technical field [0001] The invention belongs to the field of asphalt composite modification, and relates to a toughening asphalt modifier, a toughening composite modified asphalt, an asphalt mixture and a preparation method thereof. Background technique [0002] Semi-rigid base is the most important form of base in my country's asphalt pavement, and it is also a major feature of my country's asphalt pavement compared with the West. It has played a huge role in improving the overall level of my country's highway industry. However, more and more problems are gradually exposed in the application of semi-rigid base, as follows: [0003] First of all, the semi-rigid base layer itself has the characteristics of temperature shrinkage and drying shrinkage, which is easy to cause more shrinkage cracks. Under the action of vehicle load and environmental factors, the cracks gradually expand from bottom to top, and finally lead to cracking of the surface layer, that is, reflection crack...

AI Technical Summary

Problems solved by technology

At the same time, on the one hand, adding structural layers will lead to a significant increase in project costs; on the other hand, the increase in procedures and control links will greatly increase the difficulty of asphalt pavement construction organization, progress, and quality control, as well as the work intensity of all staff. Factors that must be carefully considered by the project

[0007] Unfortunately, as the lower layer of the crack-resistant key functional layer (crack-resistant functional structural layer), there are few reports on the research and application of material optimization and functional design. So far, most of the domestic high-grade pavement , are still habitually using ordinary asphalt AC-25

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