Clogging and rehabilitation performance of pervious concrete

Abstract

The performance of pervious concrete (PC) was observed for different cloggers, namely, sand, clay and their combination (S&C). The clogging potential of PC was determined by simulating natural clogging conditions on cylindrical specimens with a sediment load of 50, 150 and 200 g for sand, clay and combined S&C-laden runoff cycles, respectively. Furthermore, this study was extended to observe the recovery rate of infiltration using rehabilitation techniques such as vacuuming, pressure washing and vacuuming followed by pressure washing. It was observed from the results that an S&C clogger shows overall critical results of clogging as 80% of the clogging was observed in three to four cycles. Furthermore, sand showed 80% of clogging after seven cycles, and clay after eight. Among rehabilitation techniques, vacuuming shows an average recovery rate of 52, 75 and 76% for clay, sand and S&C cloggers, respectively. The average recovery rates were 63% for clay, and 71% for both sand and S&C cloggers on applying the pressure washing technique. However, vacuuming followed by pressure washing shows a maximum recovery rate of 78, 77 and 64% against clay, sand and S&C cloggers, respectively.