Magnetic powder modified asphalt mixture and preparation method thereof

Abstract

The invention discloses a magnetic powder modified asphalt mixture and a preparation method thereof, wherein the magnetic powder modified asphalt mixture is prepared by replacing part of mineral powder and fine aggregate components in a traditional asphalt mixture with magnetic powder, and the magnetic powder modified asphalt mixture comprises the following components in percentage by mass: 0.1-50.0% of magnetic powder, 2.0-15.0% of asphalt, 40.0-95.0% of aggregate, 0.0-40.0% of mineral powder, 0.0-1.0% of fiber and 0.0-1.0% of a surfactant. The magnetic powder modified asphalt mixture is mainly used for steel bridge deck pavement, and forms a pavement system together with an anticorrosive coating, a waterproof bonding layer, a buffer layer and the like. After paving, magnetizing the magnetic powder through an external magnetic field to magnetize the mixture paving layer so as to achieve a magnetic hardening effect, so that on the basis of physicochemical bonding of a traditional paving system, magnetic bonding between the mixture of the paving layer and the steel bridge deck slab is additionally increased, and the rigidity difference is reduced; therefore, the interlayer bonding and deformation compliance of the steel bridge deck pavement system are enhanced. The magnetic powder modified asphalt mixture can also be used for technologies such as pavement internal defect self-diagnosis and the like.

Description

technical field [0001] The invention relates to a magnetic powder modified asphalt mixture and a preparation method thereof, which can be applied to the asphalt mixture pavement layer of the steel bridge deck pavement system, and can also be used for the asphalt mixture required by technical requirements such as self-diagnosis of internal defects of the asphalt pavement, and belongs to The field of building materials technology. Background technique [0002] With the rapid development of my country's transportation industry, more and more long-span bridges are being built. Among them, due to the orthotropic steel bridge deck box girder system has the advantages of light weight, strong lateral wind resistance, convenient transportation and erection, better mechanical performance of the space structure, and shorter construction period, it is widely used in modern bridge construction, especially large Widely used in span bridge construction. At the same time, steel deck pavem...

AI Technical Summary

Problems solved by technology

The asphalt concrete pavement system of the steel bridge deck is directly paved on the orthotropic steel bridge deck. Due to the large flexibility of the orthotropic steel bridge deck, under the combined action of natural factors such as traffic loads and temperature changes, wind loads, and earthquakes, its The force and deformation are much more complicated than the asphalt pavement pavement on the asphalt concrete pavement and cement concrete bridge, and the working environment is also more severe, which makes the steel bridge pavement asphalt pavement layer prone to shifting, rutting, and delamination Early damage phenomena such as fatigue cracking

Images