Unidirectional Heat-Transfer Asphalt Pavement for Mitigating the Urban Heat Island Effect
Publication: Journal of Materials in Civil Engineering
Volume 26, Issue 5
Abstract
The absorption of solar radiant heat is the primary reason for the high temperature of asphalt pavement and the exacerbation of the urban heat island effect. In this paper, a novel unidirectional heat-transfer (UHT) asphalt pavement structure was proposed, which allows heat transfer along a fixed direction. The UHT effect was demonstrated under lamp lit indoor and sunlit outdoor environments. Compared with the control specimens, the UHT specimens were able to reduce the surface temperatures of 6.2°C (day) and 1.3°C (night), after one day’s cycle of simulating indoor heat absorption and release. The outdoor measurements showed that reductions of 3.4 and 1.2°C in the surface temperature of the UHT specimens were achieved during the day and night, respectively, when compared with the temperature of the control specimens. The calculation results also indicated that more than of heat was introduced into the soil and less than of heat was transferred out of the UHT specimens, which validated the self-cooling effect of the designed UHT structures. The proposed gradient thermal conductivity structure is a promising new technology to mitigate the urban heat island effect.
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Acknowledgments
This work was financially supported by the National Natural Science Foundation of China (No.50973018).
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Information & Authors
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Published In
Journal of Materials in Civil Engineering
Volume 26 • Issue 5 • May 2014
Pages: 812 - 821
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Feb 12, 2012
Accepted: Jun 10, 2013
Published online: Jun 13, 2013
Discussion open until: Nov 13, 2013
Published in print: May 1, 2014
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