Asphalt pavement heat reduction via heat reflective coating

Urban heat island (UHI) is identified as one of the climate changes root causes.The heat reflected by buildings and pavements had warmed up cities' surface temperature significantly.With rapid urbanization in many countries, UHI must be reduced.Therefore, works and research have been carried out to identify effective techniques to lower the impact of UHI by reducing the surface temperature of these surface and air, especially in urban areas where buildings and pavements exist in higher probabilities than that in outskirt areas.Of the available known methods, heat-reflecting coating is considered as the simplest method because the coating can be applied on different surfaces, should reduce heat storage and to inhibit surface temperature from rising.This work is a physical coating performance investigation using a heat reflective coating on asphalt surface, which aims to mitigate UHI under different of weather conditions.In this regard, asphalt pavement was subjected to outdoor tests when applied to a heat-reflective coating under sunny, rainy, and overcast conditions.Our results showed that the color pigment on the coating, e.g.blue and grey coating has a cooling impact of up to 3.5% and 2.2% for the temperature reduction, respectively in rainy conditions.For sunny conditions, the cooling effect 9.9% and 3.6% for blue and grey coating respectively.