Modifying method for improving shape memory property of asphalt

Abstract

The invention relates to a modifying method for improving the shape memory property of asphalt and belongs to the technical field of asphalt pavement materials. By adoption of the modifying method, the problems that the shape memory property is poor, the self repairing needs long load interval, low in rate, low in efficiency and poor in effect, and the microcracks only can be repaired once in the existing asphalt are solved, and the durability of the asphalt pavement is improved. The modifying method comprises the following steps: firstly preferring shape memory polymers with matching of revertible-phase phase transformation temperature and pavement temperature field, and adopting a high-speed shearing machine to prepare modified asphalt with the shape memory property; then analyzing the influence of the shape memory polymers on the properties of the asphalt components by utilizing an X-ray diffraction and transmission electron microscope and a dynamic shearing rheometer and the like; and finally testing the shape memory property of the asphalt doped with the shape memory polymers, and by comprehensive consideration of all test results, determining the types of the shape memory polymers and the optimum dosage thereof so as to further improve the shape memory property and the self-repairing efficiency of the asphalt, improve the self-repairing capability of the asphalt pavement and prolong the service life of the pavement pavement.

Description

technical field [0001] The invention relates to a modification method for improving asphalt shape memory performance for self-repairing asphalt, and belongs to the technical field of asphalt pavement materials. Background technique [0002] In recent years, China's highways have developed rapidly, and asphalt mixture pavement has become the mainstream of road pavement due to its advantages such as smooth surface, low vibration, low noise, wear resistance, short construction period, easy maintenance and recyclability. First of all, because the asphalt pavement has been exposed to the natural environment and the driving load in the early stage of use, it is prone to damage, and fatigue cracking is one of the early damage forms of the asphalt pavement. Coupled with the repeated effects of traffic loads and the environment, the microcracks in the asphalt continue to expand and develop, become denser, and penetrate through the Unicom to form macrocracks, which eventually lead to ...

AI Technical Summary

Problems solved by technology

[0011] In order to solve the current problems of poor shape memory performance of asphalt, long load intervals required for self-repair, slow self-repair rate, low efficiency, poor effect, and only one-time repair of micro-cracks, etc.