Runoff infiltration through permeable block pavements

A permeable concrete block pavement is a mainstream type of pavement that is suitable for trafficking and also acts as the drainage system. It allows water to pass through the surface, between each block, and into the laying course and sub-base where it is stored and released slowly into the subgrade. Permeable concrete block pavements are very effective at removing pollution from runoff, when water passes through the joint and sand layers. The estimation of infiltration rate through a permeable concrete block pavement is very important in order to prevent the water from ponding on the surface. In the present study a new laboratory test apparatus was built to simulate the actual conditions of permeable block pavements based on various parameters including the type of sand materials, thickness of the block and the joint width, and a correlation was achieved for the infiltration rate through the joint sand. The results are of value to designers wishing to control and prevent surface runoff water and compare the intensity of the rainfall with the infiltration rate through the permeable concrete block pavement.