Abstract
This article is intended to investigate the microwave heating performance of asphalt mixtures containing magnetite powders (MPAM). For this purpose, the surface temperatures of asphalt mixtures containing different dosages of magnetite powders were measured during microwave heating. The low-temperature bending test and water sensitivity test were also conducted to evaluate the performance of MPAM. Heating rate and reflection loss of different thicknesses of MPAM were determined using a microwave heating test and arch reflectivity test, respectively. The results showed that because its main components are triiron tetroxide and iron oxide, which have excellent microwave-absorbing properties, magnetite powders can be used as microwave absorbers to improve the ability of microwave absorption and increase the heating rate of asphalt mixtures. The heating rate of the asphalt mixtures increased with the increase of the amount of magnetite powder. The addition of magnetite powder improved the low-temperature properties of the asphalt mixture, but it reduced the water stability of the asphalt mixture. Considering that the microwave-absorbing asphalt mixture used for melting snow and ice should have good water stability, the recommended dosage of magnetite powders was 60%. The microwave-absorbing properties of MPAM were related to its thickness in the pavement structure and frequency of microwaves. In order to greatly enhance the absorbing efficiency, future work should be focused on matching thickness and matching frequency.
Highlights
Removal of snow and ice from pavement surfaces is essential for traffic safety in the winter [1]
tensile strength ratio (TSR) should be greater than 80%.beIngreater order to meet water stability requirements and maintain the and maintain maintain the the microwave microwave heating heating performance performance of of MPAM, MPAM, the the recommended recommended dosage dosage of of magnetite magnetite and microwave heating performance of MPAM, the recommended dosage of magnetite powders is 60%
Magnetite powders can be used as inexpensive microwave absorbers to improve methodology using microwaves
Summary
Removal of snow and ice from pavement surfaces is essential for traffic safety in the winter [1]. Mechanical snow removal and snow melting agents are often used to remove snow and ice from pavement surfaces by road maintenance departments [2]. Mechanical snow removal faces difficulties when removing snow compaction and can cause surface damage. Considering the defects of traditional snow melting and deicing methods, it is necessary to develop a new, efficient, and clean method for removing snow and ice. Microwave deicing uses microwaves to rotate polar molecules in the asphalt mixture to generate thermal energy in order to melt and separate the ice layer in the snowpack from the pavement surface [5,6,7,8]. Compared to traditional snow melting and deicing methods, microwave deicing technology has the advantages of high deicing efficiency and being environmentally friendly [9]
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