▪ About Heat island?
In the city, there are many concrete and asphalt structures easily heated by solar heat. Also, while the fuel of factories, homes and cars in the city is burned, it generates heat at the same time. Due to these, there is the phenomenon called the heat island effect that the temperature of the city is 2 to 5 ℃ as high as of the suburb. As for widely known isolation-heat technology, there are reflection-paint coating(structure and pavement), heat-reduction pavement(water retention). Applying reflection paint to a building and pavement can reduce the surface temperature of the building up to 30 ℃, and 15 ℃ over the pavement. In summer, heat-reduction pavement(water retention) has the effect of reducing the pavement surface temperature to 10~20 ℃
▪ Solution
We can consider ways about applying heat-reduction pavement(water retention) to main section of expressway, spraying water using dirt wagon and applying reflection paint to office and tollgate.

• Yu-seok Gong(Enviroment Research Division, Highway and Transportation Technology Institute)
• Ci-won Lee(Department of Civil Engineering, Seoul National University of Science & Technology)
• Sung-ho Mun(Department of Civil Engineering, Seoul National University of Science & Technology)