Maintenance of the asphalt surface requires regular quarterly vacuuming to prevent clogging by sediment and debris. With the appropriate design and installation, porous asphalt pavement can have a lifespan of more than 20 years. This stone bed, often 18–36 inches in depth, provides a sub-base for the porous asphalt paving. The stone bed’s size and depth must be designed so that the water level never rises up into the asphalt. As the water drains through to the porous asphalt into the stone bed, it slowly infiltrates the soil. Porous asphalt pavements are constructed in an open stone bed that provides drainage for water. Visibility for drivers is so much better that crashes and fatalities can be significantly reduced. Water is forced to drain off to the side of the highway.Įven in a driving rainstorm, splash and spray from trucks are absorbed into the pavement.
The Rainwater sinks into the porous asphalt pavement surface and settles on an impermeable asphalt layer below.
Instead of putting the porous asphalt over a stone bed, they pour it as a thin surface layer on conventional highway pavement. Highway engineers also use porous asphalt surface mixes. Porous asphalt pavements have successfully been used for residential and urban streets. Porous asphalt has many uses, including parking lots, driveways, sidewalks, bike paths, and recreational areas like playgrounds, basketball courts, and tennis courts. The layer under the porous asphalt has the storage capacity to hold the collected water. The asphalt surface is made porous by building with open-graded friction coarse aggregate. Porous asphalt is a permeable asphalt surface placed over a granular working platform on top of a large stone reservoir.
The surface appearance of porous asphalt is similar to traditional asphalt, but it has a rougher texture. Porous asphalt pavement is a specialized asphalt mixture comprised of both fine and coarse aggregates bound together by a bituminous binder. Many consulting engineers and public works officials have turned to porous asphalt pavements to promote infiltration. Although detention basins and reservoirs are effective in slowing the rate of runoff, they require additional land. Impervious surfaces such as parking lots and paved roads are often the causes of stormwater runoff, carrying residues into streams and waterways.
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