A low-cost long-residence time high-performance modified asphalt and its preparation method

Abstract

The invention discloses a low-cost, long-reserved time and high-performance modified asphalt and a preparation method thereof. The modified asphalt is an A and B dual-component system, wherein the component A is an epoxy resin and polyethyleneglycol diglycidylether mixture; and the component B comprises an emulsifier, matrix asphalt, a solidification agent and activated waste rubber powder. The preparation method comprises the following steps: adding the activated waste rubber powder into the matrix asphalt, adding the emulsifier and the solidification agent under a high temperature condition, carrying out shearing emulsification to obtain the component B, and fully mixing the component A and the component B of the modified asphalt to obtain the low-cost, long-reserved time and high-performance modified asphalt. Long reserved time is realized through selecting the specific epoxy resin solidification agent and regulating the solidifying rate of an epoxy system in order to meet road pavement and engineering maintenance with long reserved time requirements. The matrix asphalt and the waste rubber powder are used, so the production cost is reduced, and the low-temperature cracking resistance and stability of the modified asphalt are improved.

Description

technical field [0001] The invention relates to a modified asphalt material and its preparation, relates to the preparation of a modified asphalt material with adjustable retention time, in particular to a low-cost, long retention time, high-performance modified asphalt and a preparation method thereof. Background technique [0002] Epoxy asphalt mixture is a kind of mixture obtained by mixing components A and B, and mineral mixture (including coarse aggregate, fine aggregate and filler) composed of a reasonable selection of grades and fully mixed in an appropriate proportion. , Widely used in road paving, road repair and maintenance. Compared with gravel road, the strength and stability of this kind of road are greatly improved. As we all know, epoxy asphalt mixture needs to be mixed in the mixing building, and then transported to the site by transport vehicles for paving. Once the two components of epoxy asphalt are mixed, the chemical reaction will start, the viscosity wi...

AI Technical Summary

Problems solved by technology

In some large cities, due to environmental protection issues, the mixing plant cannot be erected, and the mixing plant can only be erected in the suburbs. Due to factors such as distance and traffic, it takes a long time to transport the mixture to the paving site in the city, and sometimes even exceeds 2 hours, while the existing epoxy asphalt materials generally have a residence time of about 1 hour. During transportation, the epoxy asphalt mixture may have become too viscous or even solidified, resulting in the mixture being scrapped

In some remote areas, the mixing plant cannot be erected due to traffic conditions, terrain and other factors, which will also lead to too long transportation time and cannot be paved with epoxy asphalt materials

[0003] In summary, although epoxy asphalt materials have excellent performance, there are still outstanding problems of short residence time in the application process, which leads to a certain degree of limitation in the application of some road and bridge projects.

At present, domestic academic research mainly involves "holding time and rolling process" and "determining method of holding time", but based on formula design and curing reaction mechanism to study how to improve the holding time of epoxy asphalt, relevant domestic literature and patents have not been reported