Road pavements generally are raised to a high temperature owing to heat accumulation in summer, thereby consequently giving adverse effects to thermal environment of road space such as pedestrians' pathway.
In this study, in order to quantitatively determine the actual conditions, the thermal environment was investigated together with the problems from the viewpoints of the pedestrian's perception and the surface characteristics.
As a result, a remarkably high surface temperature of the road pavement, centering about daytime in summer was particularly observed. Especially, strong sunlight and heatedness of the road pavement gave great causes for hotness and discomfort of the pedestrians, with a close cause-and-effect relationship therebetween. Therefore, the surface characteristics of the pavement material, one of such causes, were remarked, and two indices, coloring and area of surface, were chosen, and the relationships with the changes in the surface temperature were quantitatively analyzed.
As a result, there is observed a negative correlation between the brightness, expressing the luminescence of the surface, and the surface temperature, so that an increase of the surface temperature could be suppressed by increasing the brightness. In addition, it was quantitatively shown that an increase in the surface area by producing ruggedness on the road pavement promoted heat dissipation of the road pavement in night time, whereby the surface temperature could be lowered.
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