01643847

Component

https://doi.org/10.3141/2639-10

Rigid pavements have an impact on the urban heat island (UHI) and hence the surrounding environment and human comfort. Currently, most studies use a mesoscale approach in UHI characterization of pavements. This study proposes a microscale approach that can be incorporated into a pavement life-cycle assessment (LCA). The heat flux of various concrete pavements containing layers of varying thermal diffusivity and inertia was simulated. The surface pavement radiative forcing (RFp) was developed as a metric for use in a pavement LCA. Additionally, the heat conducted and stored in each concrete pavement system was analyzed using an average seasonal day metric to understand the temporal pavement energetics. Of the various thermal cases, only a higher albedo surface significantly changed the RFp for a fixed climate. However, a time lag was induced by the thermal inertia of the base course, which decreased the amount of heat conducted out of the pavement at night by storing heat in the base course for a longer time, effectively reducing nighttime UHI. Diurnal variations in thermal behavior can be controlled by changing the thermal properties of subsurface layers, which can be used to partially mitigate UHI.

01632579

17-00780

English

0000-0001-6194-269X

pp 73-83

2017

Transportation Research Record: Journal of the Transportation Research Board

9780309441636

Digital/other

Figures; References; Tables

Life cycle analysis; Rigid pavements; Thermal properties

Urban heat island

Environment; Highways; Pavements

TRIS, TRB, ATRI

Aug 21 2017 9:24AM

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