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Analysis on Environmental Thermal Effect of Functionally Graded Nanocomposite Heat Reflective Coatings for Asphalt Pavement

1
Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang’an University, South Erhuan Middle Section, Xi’an 710064, China
2
Xi’an Around Citybranches, Shanxi Provincial Communication Construction Group, 6 Tangyan Road Yanta District, Xi’an 710000, China
*
Author to whom correspondence should be addressed.
Coatings 2019, 9(3), 178; https://doi.org/10.3390/coatings9030178
Received: 19 January 2019 / Revised: 23 February 2019 / Accepted: 26 February 2019 / Published: 7 March 2019
(This article belongs to the Special Issue Functionally Graded Nanocomposite Surfaces)
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Abstract

The heat-reflective coating for asphalt pavement is a functional layer applied on pavement surfaces to reduce heat storage in the pavement via reflecting sunlight, thus inhibiting pavement temperature rise. The objective of this study was to analyze the environmental thermal effect of the self-developed reflective coating, namely, functionally graded nanocomposite reflective coatings, for asphalt pavement. The thermal effects of heat-reflective coatings were compared and analyzed based on field tests. A heating model of the atmosphere layer near the road surface was established. Moreover, the influence of urban road temperature on the thermal comfort of the human body was analyzed. Results showed that the radiation heat of all heat-reflective coatings decreased around two-thirds, and the convective heat decreased nearly 50% when compared with the control asphalt pavement, and the temperatures of the pavement itself and the atmosphere layer were lowered. Additionally, the heat-reflective coating improved the thermal comfort of the human body. This indicated that the heat-reflective coating reduced ambient temperate and relieved the urban heat island effect (UHI) as well as improved the environmental thermal effect. View Full-Text
Keywords: asphalt pavement; functionally graded nanocomposite heat-reflective coating; environmental thermal effect asphalt pavement; functionally graded nanocomposite heat-reflective coating; environmental thermal effect
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Zheng, M.; Tian, Y.; He, L. Analysis on Environmental Thermal Effect of Functionally Graded Nanocomposite Heat Reflective Coatings for Asphalt Pavement. Coatings 2019, 9, 178.

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