Method for preparing multifunctional mineral asphalt concrete pavement material

Abstract

The invention discloses a method for preparing a multifunctional mineral asphalt concrete pavement material. The preparation method comprises the step of adding magnetic iron powder and brucite short fibers in traditional asphalt concrete to replace part of aggregate in the raw materials of the traditional asphalt concrete, wherein the weight sum of the added magnetic iron powder and the brucite short fibers accounts for 10-25% of the total weight of the asphalt concrete materials in terms of the mass ratio; the weight of asphalt and natural aggregate accounts for 75-90% of the total weight of the asphalt concrete materials; and the weight ratio of the magnetic iron powder to the brucite short fibers is 1-4:1. By adjusting microwave electromagnetic parameters of the asphalt concrete, the microwave heating rate is improved by a dozen times compared with the traditional asphalt concrete, the mechanical property and the flame retardance of the asphalt concrete are improved at the same time while the material cost is lower, pavement microwave deicing and snow melting efficiency can be increased, and the mechanical property and the flame retardance are good when the pavement microwave rapid heating maintenance is realized, thus being applicable to asphalt concrete pavement.

Description

Technical field [0001] The invention relates to the technical field of road pavement materials, in particular to a preparation method of a multifunctional mineral asphalt concrete pavement material used for microwave heating. Background technique [0002] As we all know, road deicing in winter is of great significance to road transportation safety and ensuring smooth traffic. Microwave heating is an advanced technology for road deicing, and a lot of research has been done at home and abroad. [0003] The regeneration and maintenance of microwave-heated asphalt concrete pavement are also of great significance for saving road construction costs, prolonging the service life of road materials, and energy saving and environmental protection. [0004] However, in the process of microwave heating of asphalt concrete pavement, there is obviously the defect of low microwave heating efficiency, which severely limits the application and promotion of microwave heating technology in the field of...

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Problems solved by technology

[0004] However, in the process of microwave heating of asphalt concrete pavement, there are obvious defects of low microwave heating efficiency, which seriously limits the application and promotion of microwave heating technology in the field of pavement materials.

The reason is that the electromagnetic parameters of the asphalt concrete material itself are unreasonable, resulting in a series of problems such as low microwave absorption rate, large microwave heating depth, and slow temperature rise of the road surface.

[0005] Adding artificial microwave absorbers to asphalt concrete limits its widespread use due to its high cost

[0006] However, asphalt concrete contains asphalt material, which is a flammable material, and it is prone to fire in improper microwave heating or traffic accidents. Asphalt flame retardant is also a problem faced by asphalt pavement materials. Usually, chemical substances are used to flame retardant, and there is also the problem of high cost.

[0007] Fiber-reinforced asphalt concrete materials are also a conventional method for improving the mechanical properties of asphalt concrete. The high-strength inorganic basalt fibers mentioned in the patent 200710021648.7 require that the inorganic fibers have an elastic modulus greater than 85GPa and a tensile strength greater than 3500GPa. Obviously, mineral fibers are very It is difficult to achieve these indicators, and the cost is high, which limits its wide application