Development of Super Road Heat-Reflective Coating and Its Field Application

Yong Yi,Xiaoping Ji,Yingjun Jiang,Qilong Li,Changqing Deng,Jinshun Xue

doi:10.3390/coatings9120802

Yong Yi, Xiaoping Ji + Show 4 more

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https://doi.org/10.3390/coatings9120802

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Abstract

Heat-reflective coatings, used to reduce the asphalt pavement temperature and urban heat island effect, have a good cooling effect; coating development, however, generally focuses on cooling. This study aims to design a heat-reflective coating with both durability and cooling effect by considering the functions of each component, improving the coating bond strength and abrasion resistance, and conducting laboratory tests and test section verification. The coating developed exhibits bond strength and abrasion resistance 20% and 49%, respectively, higher than those of ordinary coatings. The experiments reveal a cooling effect of red coating up to 10.2 °C, a bond strength of up to 1.20 MPa at 25 °C, and an abrasion rate of up to 25% after 60 min; the cooling effect is basically the same as that for traditional heat-reflective coatings, but the bond strength and abrasion resistance significantly improved. In the analysis of the test section, the cooling effect reaches 7.0 °C, the performance of anti-skid decreases little, and the coating is still usable normally after 4 months.

Highlights

Big cities have significantly higher temperature than rural areas, both day and night: during the day, the heat reflection and emissions from buildings exacerbate the urban heat island effect [1], while at night, the temperature increases due to the release of the heat stored in roads and buildings
The heat absorption rate of asphalt pavements is so high that their daytime temperature exceeds 60 ◦ C and, the ambient temperature of the road is significant [7]; the heat stored in the pavement is released at night, contributing to increasing the ambient temperature
The high temperature of the road surface is the main cause of rutting deformation [8]

Summary

Introduction

Big cities have significantly higher temperature than rural areas, both day and night: during the day, the heat reflection and emissions from buildings exacerbate the urban heat island effect [1], while at night, the temperature increases due to the release of the heat stored in roads and buildings.The phenomenon of heat island effect increases year by year, increasing the energy consumption and reducing the life quality and comfort of urban residents [2,3,4,5,6]. Reducing the heat absorption of asphalt pavements has become crucial for preventing the urban heat island effect and reducing the rutting deformation of roads [9]. Coating an asphalt pavement with a heat-reflective layer can enhance the road surface’s ability to reflect solar radiation, and reduce both its temperature and rutting deformation and decrease its heat storage and alleviate the urban heat island effect [10,11,12,13,14,15]. Heat-reflective coatings can have an excellent cooling effect, reduce the temperature of asphalt pavements by 8–16 ◦ C during high-temperature periods in summer [16,17,18,19]. Cao et al compared the internal temperature of asphalt and heat-reflective pavements; At 2.5 cm depth, the temperature of the traditional pavement reached

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