World Road Association, 2012
In recent years, increased concern about global warming and climate change has made it desirable for roadwork engineers to tackle environmental issues. In addition, the increase in temperatures during summer has also become a serious problem in Japan. In particular, as the surface of asphalt pavements may reach 60°C in summer, it is thought to be a factor of another emerging issue known as the “urban heat island phenomenon” which significantly affects the thermal comfort of pedestrians. In general, high surface temperatures influence the performance of pavement surfaces, such as in terms of rutting, aging and fatigue. Bearing in mind these problems, it can be said that a reduction in surface temperature has become an increasingly important issue, in terms of sustainability as well as the environment.