The most commonly used permeable pavement surfaces are pervious concrete, porous asphalt, and permeable interlocking concrete pavers Other options include plastic and concrete grids, as well as amended soils (artificial media added to soil to maintain soil structure and prevent compaction) ()This document focuses on pervious concrete, porous asphalt and permeable interlocking concrete.
Porous AsphaltPorous asphalt pavements are being used to reduce or eliminate storm water runoff from parking lots and other such faciliti A porous asphalt pavement is constructed over a stone filled reservoir to collect and store storm water and to allow it to infiltrate into the soil between rainfalls (Figure 1) Where low soil permeability is no.POROUS ASPHALT PAVEMENTSPorous asphalt is an environmentally friendly tool for stormwater management POROUS ASPHALT PAVEMENTS In the natural environment, rainfall sinks into soil, filters through it, and eventually finds its way to streams, ponds, lakes, and underground aquifers The built environment, by way of contrast, seals the surface Rainwater and.GEOPAVE® Aggregate Porous PavementWell designed porous pavements can out perform traditional hard surface pavements such as asphalt and concrete There are some misconceptions about their cost and performance Get the facts in the following white papers.What it isWhat it is With roads and parking lots accounting for a high percentage of impervious surface, porous asphalt can be an ideal Best Management Practice in the right location It essentially eliminates the impervious surface that would otherwise be created Porous asphalt uses a standard asphalt mix with no sand or fines and a polymer binder to.The Right Choice for Porous Asphalt Porous PavementsThe porous asphalt mix has a lower concentration of fines than traditional asphalt, as shown in Table 1, accomplished by straightforward screening In all other manufacturing aspects, porous asphalt is the same as conventional asphalt and can be mixed at a standard asphalt plant With fewer fines, the asphalt is porous and allows water to drain.POROUS PAVEMENT OPERATION AND MAINTENANCEFigure 1 Routine and adequate maintenance has allowed the porous asphalt parking lot at the Morris Arboretum to still be effective 20 years after installation Planted areas adjacent to porous pavement should be well maintained to prevent soil washout onto the pavement If any washout does occur it should be cleaned off the.Porous Asphalt Pavement for Stormwater Management• Porous Asphalt Pavements (2004) Information Series 131 The National Asphalt Pavement Association, Lanham, MD 4” of porous asphalt 8 12” thickness of open graded reservoir subbase Soil permeability >05 in/hr 4” thickness of ¾”>crushed stone for frost protection.POROUS PAVEMENT OPERATION AND MAINTENANCEFigure 1 Routine and adequate maintenance has allowed the porous asphalt parking lot at the Morris Arboretum to still be effective 20 years after installation Planted areas adjacent to porous pavement should be well maintained to prevent soil washout onto the pavement If any washout does occur it should be cleaned off the.Porous Asphalt PavementPorous asphalt pavement is a paved surface and subbase comprised of asphalt, gravel, and stone, formed in a manner resulting in a permeable surface The various layers, called "courses," have the potential for stormwater detention Stormwater which passes through the pavement may completely.Structural Design Guidelines for Porous Asphalt PavementsSite selection, hydrologic design, porous asphalt and asphalt treated permeable base (ATPB) mixture design, construction, and maintenance are included only insofar as they impact structural design and performance The publication is ideal for contractors, developers.Porous AsphaltAlso, NAPA offers two publications, Porous Asphalt Pavements for Stormwater Management (IS 131) and Structural Design Guidelines for Porous Asphalt Pavements (IS 140) IS 131 is a design guide that takes the reader from site design through maintenance for porous asphalt pavements, while IS 140 provides guidance on using the AASHTO 93 design.Porous AsphaltHaul distances shall be limited such that porous asphalt shall be placed within 90 minutes of being loaded The porous asphalt is placed in 2 inch to 4 inch thick lifts using track pavers and normally compacted with only a few (1 4) passes of a 10 ton static roller.
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