Energy-based approach to characterize induced heating of asphalt concrete under electromagnetic field

In this research, the authors presented an energy-based approach to characterize the induced heating properties of asphalt concrete under the electromagnetic field. The induced heating of asphalt concrete under electromagnetic power is an innovative technique in pavement engineering for applications of induced healing, deicing, mixture heating, and improving the compaction of asphalt pavement. The efficacy of induced heating in asphalt concrete is often characterized using the surface temperature during the induced heating process. The experimental results indicated that the distributions of the electromagnetic field and thermal energy inside of asphalt concrete depend on the specimen dimension, causing inaccurate induced healing characterization. While the analysis of specimens’ surface temperature with various dimensions led to a more accurate result, there were yet disagreements between the rank orders of induced heating and induced healing. As the speculation, the heterogeneous distributions of the electromagnetic field and thermal energy inside of asphalt concrete can cause inaccurate characterizations. To remedy the mentioned problems, after the induced heating cycle, the specimens were left at room temperature to cool, and meanwhile, the surface temperature versus time was measured. According to the convection mechanism of heat transfer, the value of the outward heat flux was calculated. The integration of heat flux over the cooling stage time results in the total thermal energy absorbed by specimens during the induced heating process. Additionally, the authors proposed parameters of energy storage history and temperature storage history. The results show that the suggested energy-based approaches can properly rank the induced heating capability of asphalt concrete with more accuracy compared to the conventional surface temperature approach during the heating stage.

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  • English

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  • Accession Number: 01761465
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Dec 10 2020 3:23PM