US EPA

2570993 

Journal Article 

Heat Reflective Coating on Road Surface 

Wang Wei; Kawabata, K; Yoshinaka, T 

2009 

22-27 

WOS:000273271000004 

In summer season in the cities of Japan, the surface of temperature of asphalt pavement rises up to 60 degrees C or more. Because asphalt pavement absorbs the solar radiation becoming hotter during day and release the heat at night, the urban heat-island and global-warming is noticeable.



For reducing this problem, we have developed a new heat-reflective coating called "PerfectCool". By using hollow ceramic particle and highly reflective color pigment, this coating can reflect the solar heat and light very effectively.



Experiments and actual field tests conducted in Japan recorded that using the coating materials, 10 degrees C to 20 degrees C surface temperature reduction can be achieved than conventional pavement. For analyzing the effect of air temperature reduction, we carried out a simulation experiment. The result shows if all roads in Tokyo were painted with new heat reflective coating materials, the air temperature can be reduced by 0.8 degrees C. Also the effect of temperature reduction of pavement resulted in showing a smaller rut depth generation in a field test conducted at Narita Airport.



The result of thermal sensation survey shows that over 2/3 people felt comfortable when he walked on pavement with heat reflective coating than conventional pavement.



This paper shows the principle and effectiveness and application process of the new technology, and also presents some excellent follow up survey results in Japan The coating was used for field test in Singapore and Shanghai, as a material that is able to improve the thermal environment and reduce urban heat-island effect. 

Reflective coating; Heat-island; PerfectCool; Rut resistance Temperature reduction