Clogging of Permeable Concrete Block Pavement by Street Particulates and Rain
Clogging of permeable interlocking concrete block pavement (PP) was studied. Samples of parking lot dust and dirt (D&D) were collected from an existing PP installation and processed to remove moisture and volatile compounds. The samples were analyzed for their particle size distribution. For the experiments, city street D&D was then collected in larger quantities, processed and reconstituted into the same fractions found on the permeable paver surface.
Tests were then conducted on a full-scale PP set up in a special outdoor rig. Synthesized D&D and artificial, intense rains were systematically applied to the pavement, and surface and subsurface drainage flow rates measured. Four different PPs were tested and drainage cell, bedding and base material throughout the test pavement analyzed.
Results indicated the rate at which the synthesized D&D may clog the drainage cells of PP.
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