Volume 25 Issue 5
Oct.  2025
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LI Hui, ZHANG Xue, LYU Xing-guo, JIA Ming. Surface structural characteristics of heat-reflective cooling pavement and their influence on optical and thermal performance[J]. Journal of Traffic and Transportation Engineering, 2025, 25(5): 96-116. doi: 10.19818/j.cnki.1671-1637.2025.05.008
Citation: LI Hui, ZHANG Xue, LYU Xing-guo, JIA Ming. Surface structural characteristics of heat-reflective cooling pavement and their influence on optical and thermal performance[J]. Journal of Traffic and Transportation Engineering, 2025, 25(5): 96-116. doi: 10.19818/j.cnki.1671-1637.2025.05.008
shu

Surface structural characteristics of heat-reflective cooling pavement and their influence on optical and thermal performance

doi: 10.19818/j.cnki.1671-1637.2025.05.008
  • 1.

    Key Laboratory of Road and Traffic Engineering of Ministry of Education, Tongji University, Shanghai 201804, China

  • 2.

    Urban Mobility Institute, Tongji University, Shanghai 201804, China

  • 3.

    Gansu Communication Investment Management Co., Ltd., Lanzhou 730030, Gansu, China

Funds:

National Key R&D Program of China 2023YFB2604000

Research and Technology Program of the Gansu Provincial Department of Transportation 2023-10

International Science and Technology Cooperation Project of the Science and Technology Commission of Shanghai Municipality 23210711400

Research and Technology Program of the Henan Provincial Department of Transportation 2023-4-2

More Information
  • Corresponding author: LYU Xing-guo (1988-), male, senior engineer, 1620111784@qq.com
  • Received Date: 2024-11-01
  • Accepted Date: 2025-08-01
  • Rev Recd Date: 2025-05-24
  • Publish Date: 2025-10-28
    Abstract
  • To study the influence of pavement surface structural characteristics on the optical reflection and cooling effect of heat-reflective cooling coatings in practical applications and provide a reference for the design of heat-reflective cooling asphalt pavement materials to alleviate the urban heat island effect. The orthogonal design method was used to set nine representative gradations, and white, gray, and black heat-reflective coatings with a wide reflectance coverage range were prepared and optimized. Experimental methods including laser texture scanning, digital image processing of surface voids, reflection spectrum testing, and cooling effect tests based on laboratory solar radiation simulation were used to obtain the macro and micro morphology and optical and thermal performance indicators of the pavement, respectively, and then the correlation and significance analysis were conducted. Research results indicate that by taking into account the full-spectrum reflectance of the coatings and anti-glare visual safety, the optimal gradation type is the dense-graded fine-grained asphalt concrete with a maximum nominal particle size of 5 mm. The vertical texture of the heat-reflective pavement surface (especially the arithmetical mean deviation of the profile) has a more significant impact on the reflectance compared with the horizontal distribution and spatial morphology, with a correlation coefficient of 0.9. In order to reduce the influence of road surface texture on reflective cooling performance, it is recommended to control the vertical texture evaluation parameter, namely arithmetical mean deviation of the pavement surface after coating, within 0.2 mm and the root mean square deviation to be less than 0.4 mm. Under the optimal gradation conditions, the cooling effects of white, gray, and black heat-reflective cooling pavements can reach 14.0 ℃, 10.6 ℃, and 7.3 ℃, respectively. As the surface void ratio increases, the total reflectance of the heat-reflective pavement decreases linearly, and the reduction rate of the cooling effect is 13% - 21%. This factor can be considered when designing heat-reflective coatings based on specific application scenarios such as urban roads, parking lots, and sidewalks. The proposed influence law of surface structural characteristics of heat-reflective cooling pavements on their optical and thermal performance can serve as a theoretical basis for the precise design and performance improvement of heat-reflective cooling pavement materials.

     

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