A microwave-absorbing asphalt pavement mixture and preparation method thereof

Abstract

The invention discloses a microwave-absorbing asphalt pavement mixture which is prepared from the following raw materials in percentage by mass: 4-5.5 percent of modified asphalt, 33-65 percent of coarse aggregate, 25-55 percent of fine aggregate, 2-5 percent of ore powder and 3-7 percent of hydroxy iron powder. In addition, the invention also discloses a method for preparing the microwave-absorbing asphalt pavement mixture. The method comprises the following steps: 1, preheating raw materials; and 2, mixing and stirring raw materials, thereby obtaining the microwave-absorbing asphalt pavement mixture. When the asphalt pavement mixture disclosed by the invention is paved on the road surface, the capacity of absorbing microwaves on the surface of the pavement can be obviously enhanced, the surface of the pavement can be rapidly heated to raise the temperature due to a microwaves penetration ice layer, and the energy is transferred to the ice and snow layer through heat conduction, so that the ice and snow layer is molten into liquid water. Therefore, the ice layer is separated from the pavement, the ice and snow can be removed by adopting a manual or mechanical mode, and the working efficiency of the microwave deicing method is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of pavement functional materials, and in particular relates to a microwave-absorbing asphalt pavement mixture and a preparation method thereof. Background technique [0002] Northern China and high-altitude mountainous areas generally have a long period of ice and snow, and some even exceed half a year. Snow and ice accumulation have seriously affected road traffic and airport aircraft take-off and landing. At present, the more commonly used methods of deicing and snow removal in China include artificial methods, mechanical methods and chemical methods. However, these methods all need to invest a large amount of manpower and material resources, the labor intensity of manual operation is high, the operation effect is low, and it is easy to cause secondary freezing. [0003] In recent years, some scholars have developed and studied microwave deicing and snow removal methods that use the principle of microwave...

AI Technical Summary

Problems solved by technology

The shortcomings of the current microwave deicing and snow removal methods are: 1. The dielectric loss tangent tanδ of ice is very small, basically does not absorb microwaves, and the ability of the pavement material to absorb microwaves is insufficient, and the efficiency of deicing and snow removal is extremely low; 2. Common frequency of microwave deicing and snow removal The heating thickness under the road surface is more than ten centimeters, and the energy of the surface layer of the road surface is insufficient, resulting in energy waste and restricting the efficiency of deicing and snow removal.

[0004] Patent Nos. 200910254549.2 and 200910219359.7 disclose the use of magnetic powder and magnetic metallurgical slag or magnetic sand, silicon carbide sand, etc. to replace all or part of the calcareous mineral powder and coarse aggregate in the traditional asphalt mixture, so as to obtain asphalt concrete with microwave absorption The deficiencies of the patent for pavement materials are: 1. The wave-absorbing properties of different magnetic mineral powders are different, and the absorption capacity of microwaves of different frequencies varies greatly. The type, content, microwave frequency, etc. of the magnetic mineral powder are not specified in the patent The relationship between the microwave-absorbing pavement material and the prepared pavement material is too general; 2. The replacement ratio of magnetic mineral powder and coarse aggregate is too high, which will easily cause a large change in the pavement performance of the prepared microwave-absorbing pavement material, and the cost is too high. high

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