nalysis of thermal and hydraulic performance of pervious concrete overlay under clogging conditions

Accelerated urban growth results in soil impermeabilization, intensifying problems such as floods and urban heat islands (UHIs) formation. Pervious concrete pavement (PCP) is a strategy used to mitigate these problems, with the capacity to regulate stormwater runoff and its low thermal conductivity. However, clogging, caused by the infiltration of sediments, obstructs the pores of the PCP, compromising its hydraulic and thermal performance. This study investigates the effects of clogging on PCP overlay, with a focus on thermal behavior and conductivity. Initially, air temperature and humidity were evaluated to understand their influence on the surface temperatures of the clean PCP. When comparing the unclogged and clogged PCPs, the unclogged PCP showed surface temperatures on average 1.25 °C higher than the clogged ones under solar exposure. The thermal conductivity analysis revealed the impact of clogging with sand, which has a conductivity 85.7% higher than air. The results indicate that, although clogging impairs hydraulic performance, it improves thermal performance. These findings suggest that the balance between hydraulic and thermal behaviors must be evaluated when managing low-impact development structures.