In summer, black asphalt pavement can absorb a considerable amount of solar radiation, which causes its temperature to rise. Heated asphalt pavement can aggravate the urban heat island (UHI) effect and transfer heat downward, which may cause the problem of permafrost thawing beneath pavements. The objective of this study was to develop a novel cool coating layer (CCL) with high near-infrared reflectance and heat insulation to make the surface of asphalt pavement cool. A self-developed test device and method was established to evaluate cooling effects. Based on the experimental results, the optimal coating can cool asphalt pavement by 11.21 °C when the radiation striking the sample surface is 650 W/m². This coating, called the composite cool coating layer (CCCL), is composed of the following materials: polyurethane resin, rutile TiO₂ of 18%, hollow glass microspheres of 12%, and copper chromite black spinel of 0.7%. Silicon carbide particles of 1 kg/m² can help the CCCL achieve satisfactory antiskid performance. In conclusion, CCCL can effectively inhibit the absorption of solar radiation and reduce the flow of thermal energy downward without sacrificing skid resistance.

中文翻译：

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提议的具有高近红外反射率和隔热性的沥青路面凉爽涂料

在夏季，黑色沥青路面可以吸收大量的太阳辐射，从而导致其温度升高。加热的沥青路面会加剧城市热岛效应（UHI）并向下传热，这可能会导致永久冻土在路面下方融化的问题。这项研究的目的是开发一种具有高近红外反射率和隔热性能的新型冷涂层（CCL），以使沥青路面的表面变凉。建立了自行开发的测试设备和方法来评估冷却效果。根据实验结果，当照射到样品表面的辐射为650 W / m ²时，最佳涂料可以将沥青路面冷却至11.21°C。。这种涂层称为复合冷涂层（CCCL），由以下材料组成：聚氨酯树脂，金红石TiO ₂为18％，中空玻璃微球为12％和亚铬酸铜黑尖晶石为0.7％。1 kg / m ^2的碳化硅颗粒可以帮助CCCL获得令人满意的防滑性能。总之，CCCL可以有效地抑制太阳辐射的吸收并减少向下的热能流，而不会牺牲防滑性。