Quantifying Evaporation from Pervious Concrete Systems: Methodology and Hydrologic Perspective

A review on the development of cool pavements to mitigate urban heat island effect

“…Nemirosky et al [80] experimentally quantified the evaporation of pervious concrete samples in lab by using artificial solar irradiation to heat up the samples at diurnal cycles. The base and subgrade were undrained and there was different water ponding at the experimental samples.…”

“…(a) Evaporative flux during the first 10-hour, and (b) Evaporative flux after 10 h. Note: the sample is subjected to sinusoidal radiation and to different water-ponding depths of 0, 25 mm, 78 mm, and 152 mm; data reproduced from[80] with permission.…”

The Albedo of Pervious Cement Concrete Linearly Decreases with Porosity

“…However, measurements in field and in lab have shown that the evaporation of the pervious concrete contributed very limitedly to the evaporative cooling of pervious pavements, especially days after wetting [4,16]. Pervious concrete has higher surface temperature than normal concrete during daytime but lower temperature during nighttime [17,18].…”

“…Considering a typical summer day with a zenith solar radiation of 1000 W/m 2 , the pervious concrete can absorb 50∼ 150 W/m 2 additional solar radiation. At midday in summer, the evaporation of the dry pervious concrete contributes about 33-47 W/m 2 or even lower to the heat loss of the pervious surface [3,16,20]. Therefore, pervious pavements tend to absorb additional heat compared to dense pavements.…”

Permeable Pavements

“…Additionally, studies have shown that evaporation rates can be significant when the base/subbase ponding level is close to the pavement surface. However, the evaporation rate rapidly decreases as the water level drops (Li 2012;Nemirovsky 2013).…”