Abstract
Emulsified asphalt needs to be cured for a certain age after demulsification to produce strength, which seriously affects the traffic opening time. In this work, microwave heating technology was applied for emulsified asphalt repair materials. Steel slag with high microwave activity was adopted to improve the performance of emulsified asphalt repair materials by microwave heating. Effects of steel slag sizes and contents on the heating rate, temperature distribution, and thermal performance of emulsified asphalt repair materials were analyzed by close microwave heating, open microwave heating, and repair simulation tests. Results show that the temperature of emulsified asphalt repair materials presents three different heating stages under microwave irradiation. The “critical point of phase transition” in the three stages is gradually advanced with the increase in steel slag content. The core temperature and maximum temperature of emulsified asphalt repair materials with different steel slag sizes are basically the same; however, the heat distribution of emulsified asphalt repair materials is significantly different. In contrast to conventional asphalt mixture, there exists a smaller temperature difference. The temperature of repairing materials can reach above 80°C. The interface area can form an embedded interface structure. Incorporation of steel slag and adoption of microwave heating are effective to improve the performance of emulsified asphalt repair materials.
Highlights
Emulsified asphalt repair materials are a mixture of emulsified asphalt as a binder and are mixed according to a certain proportion, which is used to treat asphalt pavement potholes and other diseases. ey have the advantages of energy saving and environmental protection, low pollution, wide application, simple construction, and less external influence [1,2,3]
It is the presence of Fe element that increases the electromagnetic loss of emulsified asphalt repair materials with steel slag. is can enhance the microwave absorption capacity of emulsified asphalt repair materials to improve its heating efficiency [28]
The microwave heating efficiency and temperature distribution of emulsified asphalt repair materials with different steel slag sizes and contents were studied by the heating test and simulation test
Summary
Emulsified asphalt repair materials are a mixture of emulsified asphalt as a binder and are mixed according to a certain proportion, which is used to treat asphalt pavement potholes and other diseases. ey have the advantages of energy saving and environmental protection, low pollution, wide application, simple construction, and less external influence [1,2,3]. Microwave heating technology has been applied to asphalt and cement pavement engineering [10, 11]. Microwave heating technology is suitable for the repair of asphalt pavement cracks and depressions. Microwave treatment of metal factory waste (such as steel slag and cooper slag) is very effective in asphalt mixture crack repair [13, 14]. The mixture heated by microwave has better high-temperature rutting resistance, low-temperature crack resistance, and water stability [15]. In contrast to traditional methods, such as thermal demulsification and stable emulsion demulsification, microwave heating technology has a higher demulsification rate, higher dehydration rate, Advances in Materials Science and Engineering and better demulsification effect [19,20,21,22]. Based on the advantages of microwave heating technology, it is feasible to introduce microwave heating technology into an emulsified asphalt mixture
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