Hot Weather Comparative Heat Balances in Pervious Concrete and Impervious Concrete Pavement Systems

Temperature sensors were installed at various depths in adjacent pervious concrete and traditional concrete systems. Temperature data for both systems were analyzed for five days when the maximum temperature was greater than 32° C (90° F). All the analyses were conducted for days with negligible antecedent precipitation. Bulk heat storage was calculated for the daily heating phase, using known values and values common in the literature, for dry conditions of the various layers in the pavement systems, to a depth of a nearly constant background soil temperature. Results show that less energy was stored during heating in the pervious concrete system than in the traditional concrete system. This was observed using similar cementitious mixtures for both pavements (similar cement colors) and under solar radiation conditions whereby, based on previous research, the pervious concrete surface could be expected to have a lower solar reflectance and hence a higher surface temperature than that of the traditional concrete surface. A strategy for mitigating the UHI effect may be to employ lower energy-storage pavement systems. Using pervious concrete systems, whose layers of materials have higher porosity than do traditional pavement systems, may be an effective tool in reducing the UHI effect. Considerations of material characteristics below grade (e.g., porosity) are important in determining a permeable pavement’s capacity for UHI mitigation. Solar reflectance should not be used independent of these other variables

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