Study on Thermal Radiation Properties Enhancement of the Lower-Heat-Storage Asphalt Concrete

Abstract:

A new kind of infrared powder has been prepared to enhance the thermal radiation properties of the lower-heat-storage asphalt concrete. Tests have determined the most suitable ratio of four kinds of transition metal oxides in CM infrared powder, adjusted the sintering process parameters to improve the infrared emissivity, investigated the grain-size effect on its emissivity, and evaluated the thermal radiation properties of the asphalt concrete. The results show that the adding of transition metal oxides can effectively improve the infrared property of CM powder in the wave band from 8μm to 14μm at 25°C. Each sintering process parameter has effect on the infrared emissivity in varying degrees. Besides, the emissivity of infrared powder increases with particle size decreases before the size approaches nanoscale. According to the best mixing proportion and the sintering process parameters adjusted, CM-β infrared powder with average particle size of 18μm is prepared, and its emissivity in the wave band from 8μm to 14μm is 0.044 higher than CM powder. The thermal radiation test shows that the surface temperature of the asphalt mortar mixed with CM-β powder is 3.96°C lower than the one with CM powder.

• Periodical: Applied Mechanics and Materials (Volumes 316-317)
• Pages: 968-974
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.316-317.968
• Online since: April 2013
• Authors: Nan Ding, Jian Guang Xie, Lei Lei Liang, Ye Hu, He Xiao, Ya Jun Wang
• Keywords: Asphalt, Asphalt Concrete, Heat Island Effect, Infrared Powder, Thermal Radiation

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