A modified asphalt mixture based on high temperature difference area and its preparation method

Abstract

The invention belongs to the field of road engineering and pavement engineering and discloses a modified asphalt mixture based on high-temperature-difference regions and a production method thereof. The modified asphalt mixture is modified by taking a binary compound shape-stabilized phase change material with stearic acid and palmitic acid or expanded perlite as one part of fine aggregate. Diatomite is taken as a modifier and is mixed into matrix asphalt; the mass of the diatomite is 1.5-2% of the mass of the matrix asphalt. Assessment standards of high-temperature stability and low-temperature crack resistance of the asphalt pavement; the ratio of components of the modified asphalt mixture can be determined according to the temperature change range of the region, so that the construction materials are reduced. Through adoption of an active-passive compounding method in the modified asphalt mixture, the pavement performance of the asphalt pavement in the high-temperature and low-temperature environment can be greatly improved; the modified asphalt mixture has heat insulation effect, so that the surface layer and the base layer of the pavement can be protected; the materials used in the mixture are environmentally friendly and low-cost; the development of environment-friendly asphalt pavement can be facilitated.

Description

technical field [0001] The invention belongs to the field of road engineering pavement engineering, and relates to a modified asphalt mixture and a preparation method thereof, in particular to a modified asphalt mixture and a preparation method based on high temperature difference regions. Background technique [0002] Since the economic crisis in 2008, the country has increased investment in infrastructure construction, especially in roads, and regions such as the Northeast, Northwest, and the Qinghai-Tibet Plateau have also entered a period of great development in road construction. However, these areas are all areas of high temperature difference. The temperature difference between summer and winter is large, and the annual temperature difference can reach as high as 49.2°C. Most of the main highways and urban roads in our country use asphalt pavement. In the process of road operation, asphalt pavement is prone to damage due to high temperature instability due to heat ab...

AI Technical Summary

Problems solved by technology

Taking advantage of this characteristic of phase change materials, some scholars have applied it to the field of road construction, but the current research on phase change materials for pavement is simply using phase change materials (unit or multi-element) as an additive, and phase change materials are easily It will fail and seriously affect the road performance of asphalt pavement. This application method is simple but it is difficult to take advantage of the advantages of phase change materials.