Method for improving self-healing of cold-mix asphalt mixture based on nano carbon fibers

Abstract

The invention relates to a method for improving self-healing of a cold-mix asphalt mixture based on nano carbon fibers, and belongs to the technical field of road repair. The problems that an existingmicrocapsule self-healing technology and electromagnetic induction heating technology are large in limitation, conditions are severe, the research on self-healing of the cold-mix asphalt mixture is not realized by using a microwave heating technology, and the research on using nano carbon fibers and PCL as fillers is not carried out are solved. The method comprises the steps that SBS modified emulsified asphalt is prepared at first, then the modified emulsified asphalt is mized with carbon nanofibers, PCL and the like at room temperature to prepare the cold-mix asphalt mixture, a joist test piece is prepared, a damaged test piece is obtained by using a four-point bending fatigue test, cracks are marked, and finally microwave heating equipment is used for heating the damaged test piece tobe higher than the softening point by 10 DEG C for 30 minutes; and fatigue test is carried out again on the damaged test piece subjected to self-healing and curing to determine the self-healing rate of the test piece so as to determine the optimal mixing amount of the nano carbon fibers. The cold-mix asphalt mixture prepared by the method can improve the self-healing capability of an asphalt pavement.

Description

technical field [0001] The invention relates to a method for improving the self-healing of cold-mix asphalt mixture based on nano-carbon fibers, and belongs to the technical field of road restoration. Background technique [0002] In recent years, my country's road engineering has developed rapidly, and asphalt roads have developed rapidly due to their high strength and good comfort. Up to now, asphalt roads have accounted for more than 90% of all types of roads. At present, whether in new roads or road maintenance projects, the amount of asphalt mixture is extremely large, and the commonly used hot-mix asphalt mixture has problems such as high energy consumption, high pollution, and inconvenient construction, which makes the industry's new asphalt mixture The demand for materials is very urgent. At this time, cold mix asphalt mixture has become a kind of material because it can overcome the restrictions of season, weather and temperature in the process of building and repa...

AI Technical Summary

Problems solved by technology

[0009] The invention is a method for improving the self-healing of cold-mix asphalt mixture based on nano-carbon fiber, which solves the problem that the current microcapsule self-healing technology and electromagnetic induction heating technology have large limitations, harsh conditions, and no microwave heating technology is used to realize cold-mix asphalt Research on the self-healing of the mixture, research on the absence of carbon nanofibers and PCL as fillers, etc.

[0011] In order to solve the limitations of the current microcapsule self-healing technology and electromagnetic induction heating technology, the conditions are harsh, there is no research on using microwave heating technology to realize the self-healing of cold-mix asphalt mixture, and there is no research on using nano-carbon fiber and PCL as fillers, etc. question