Japan Introduces Solar Heat-Blocking Pavements

August 21, 2017
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The host city of Olympic and Paralympic Games in 2020, Tokyo is working on heat blocking methods during the summer.
Among various measures, originally research and practical application of a thermal barrier applied to pavement has been advanced to reduce a rise in temperatures from the summer heat.
It is the technology to apply a heat shield that reflects the sunlight causing the rise of the temperature of the road surface.
This solar heat-blocking pavement reflects incoming sunlight, making it difficult to heat the pavement and can reduce the rise in road temperatures by up to eight degrees Celsius.
Noise reduction technology has also been applied to Japanese roads to mitigate road noise.
Yusuke Nishioka, an official of the Bureau of Construction, said, “This is mainly used in Tokyo. It is paved with a lot of gaps. The pavement contains a lot of large stones, and based on the many gaps between the stones, it functions to lower road noise. We have adopted this in anticipation of reducing road noise.”
A thermal barrier coating is applied to the surface of the noise reduction pavement and is compatible in suppressing noise of the road surface.
“This is low noise pavement with a lot of gaps in it. This is low noise pavement with a thermal barrier coating. This is the lamp that simulates the sun. On the left is the surface temperature. On the right, is the temperature slightly away from there. The surface temperatures are quite different. The temperature in the dome above is different, so it does show the effect of the thermal barrier coating in the pavement,” Nishioka added.
As a part of research and development, tests have also been done to observe changes in temperature in multiple types of pavements.
The effect of the heat barrier pavement, which suppresses the rise in temperature of the road, can be measured using various devices or methods, including thermography.
At present, the center of Tokyo has been the focus of this application. It has been performed accordingly during road repairs.
Nishioka said, “I believe that this technology can be applied as a countermeasure to reduce the absorption of heat in pavement in other countries that experience hot weather.”
NEC opens its first Advanced Centre for Experimentation (ACE) in Singapore, aiming to facilitate the company’s global Research & Development capabilities.
ACE is strategically located in Singapore and is a key component of NEC’s growth strategy in the Asia Pacific region.

Source: ANI

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