Comparison of Induction and Microwave Heating in the Healing Process of Asphalt Mixtures Containing Conductive Materials

Document Type : Research Paper

Authors

1 Professor, School of Civil Engineering, Iran University of Science and Technology (IUST), Tehran, I. R. Iran.

2 PhD. Candidate of Raod and Transportation, School of Civil Engineering, Iran University of Science and Technology (IUST), Tehran, I. R. Iran.

Abstract

One of the well-known methods regarding the return of asphalt mixture failures and, as a result, increasing its lifespan is self-healing, which has always been of interest to researchers due to its many benefits. Applying thermal energy or heating the asphalt mixture leads to self-healing the asphalt mixture by accelerating the bitumen healing process. Two main methods of induction heating and microwave are used in this field. This article compares these two heating-healing methods and introduces the more appropriate option. For this purpose, both induction and microwave heating methods have been used to apply heat to the components of the asphalt mixture, including bitumen, filler, and aggregates. The research results showed that the microwave heating rate of bituminous mastic containing conductive materials is higher than its induction heating rate, so the microwave heating rate of the mastic sample containing 10% by weight of iron powder (0.100 °C/s) was more than three times its induction heating rate (0.031 °C/s). Additionally, bituminous mastic heated with microwaves exhibits a more consistent thermal distribution, which enhances its self-healing properties. Unlike induction heating, which requires conductive additives and aggregates, the microwave method can heat components with or without conductive materials. However, addition of conductive materials can accelerate the microwave heating process. For instance, adding 10% by weight of iron powder to bitumen could increase its microwave heating rate from 0.083 to 0.100. In contrast, achieving the same results with the induction heating method requires several times more energy than the microwave method. Therefore, it is advisable to use the microwave heating method instead of induction heating for thermal healing of asphalt mixtures.

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Main Subjects

References

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History

  • Receive Date: 15 May 2024
  • Revise Date: 30 May 2024
  • Accept Date: 01 June 2024

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