Sediment transport and pore clogging of a porous pavement under surface runoff

Drainage capacity of pervious concrete pavements will be greatly decreased once the pores become clogged. In this study, the mechanism of sediment clogging in the pores of the pervious concrete pavement under surface runoff is preliminarily revealed. Based on the modified permeability measurement system, a series of laboratory simulation tests are conducted to demonstrate the effects of porosity of pervious concrete, sediment size, depth of free surface flow, storm water runoff velocity on the permeability reduction due to clogging of the porous pavement. Within the scope of this study, the clogging is observed to more easily occur for specimens with large porosity, for well-graded sand as the clogging materials and large storm water depth. Horizontal runoffs has little influence on the final clogging ratio.