In the calculator for porous pavement, you will calculate the pavement thicknesses required for hydrologic and. Thornton, research assistant school of mechanical engineering jorge gomez dominguez, visiting professor school of civil engineering. Mcdaniel, principal investigator north central superpave center william d. Quieter pavement surfaces would be less expensive than barrier walls and could offer benefits over a larger area by reducing tire pavement noise at its source. Porous asphalt pavements allow for land development plans that are more thoughtful, harmonious with natural processes, and sustainable. Field evaluation of porous asphalt pavement final report sqdh 2004 3 hl 2004 6 by. In the natural environment, rainfall sinks into soil, filters through it, and eventually finds its way to streams, ponds, lakes, and underground aquifers. Accepting that the porous asphalt itself is a more expensive surfacing, the extra cost of which is offset by the savings in underground pipework etc. Patch damaged areas larger than 50 square feet with an approved permeable pavement. Resist temptation to mix porous with impermeable pavements in same section. Porous asphalt pavements offer an alternative technology for storm water. Permeable pavement fact sheet information for howard.
The right choice for porous asphalt porous pavements. If a hydraulic connection is possible, porous asphalt pavement systems shall be located per the requirements of wdnr conservation practice standards 1002, site evaluation for stormwater infiltration, and. The aim of this study is to recharge ground water to underplaying aquifers and reduce risk of flood condition. Other variations of permeable pavement that are ddoeapproved permeable pavement surface materials are also encompassed in this section. Permeable pavement with swale10% for the best success, a few key factors must be considered when undertaking a project involving permeable pavement alternatives. Porous asphalt paving cost and environmental benefits.
Design of longlife flexible pavements for heavy traffic prepared for highways agency. The study of porous asphalt pavement with emphasis in road construction design mr. The void space of porous asphalt is approximately 16%, as opposed to two to three percent for conventional asphalt. A porous pavement system is an environmentally conscious alternative to a traditional asphalt or concrete pavement system 1. The porous asphalt pavement specified herein is modified after the national asphalt pavement association napa specification outlined in design, construction, and maintenance guide for porous asphalt pavements, information series 1 2003 and design, construction, and. Porous asphalt pavement is an alternative technology that differs from traditional asphalt pavement designs, that the pavement permits. The built environment, by way of contrast, seals the surface. The national asphalt pavement association, lanham, md. Porous pavement options include porous asphalt, pervious concrete, and grass pavers.
It is a very durable product and it retains the ability to handle rainwater for many years. Porous asphalt pavement design, construction and maintenance. Porous asphalt is an innovative road surfacing technology, which allows water to enter into the asphalt mixes beyond its continuous air voids. Permeable pavement fact sheet information for howard county. Performance of porous asphalt pa was evaluated on a parking lot of the washington state university puyallup campus that included three pavement treatments in triplicate. P1 porous asphalt pa p2 pervious concrete pc p3 permeable interlocking concrete pavers picp or concrete grid pavers cgp p4 plastic grid pavers.
Porous asphalt systems combine stormwater infiltration, storage, and structural pavement in a single system. The water drains through the porous asphalt and into the stone. Permeable interlocking concrete pavement oaks pavers. Porous asphalt pavement surface course october 19, 2007 revised 15apr11 paps. Porous asphalt pavement refers to the compacted mix of modified asphalt, aggregate, and additives. Porous asphalt is a good product for local roads, parking lots and trails. One approach to lowering the cost of repairing a pavement is to apply a thin asphalt overlay as a pavement preservation treatment before more expensive treatments are needed. Background first developed in the 1970s at the franklin institute in philadelphia, porous asphalt pavement consists of standard bituminous asphalt in which the aggregate fines particles smaller than 600, or the no. Pdf laboratory performance of porous asphalt pavement. These pavements, used mostly for parking lots, allow water to drain through the pavement surface into a stone recharge bed and infiltrate into the soils below the pavement.
Porous pavement also has highway applications where it is used as a surface material to reduce hydroplaning. Parking lots are tough testlow speed turning motions. Monitoring porous asphalt stormwater infiltration and outflow. Winter performance and maintenance of porous asphalt pavements. A typical porous pavement has an opengraded surface over an underlying.
Design factor porous concrete pc porous asphalt pa interlocking pavers ip scale of applicationsmall and large scale paving applications small and large scale paving applications micro, small and large scale paving applications. With proper design and installation, porous asphalt pavements can provide a cost. Grid systems upper slope limit can range from 6 to 12%. The ideal application for porous pavement is to treat lowtraffic or overflow parking areas. A typical porous pavement has an opengraded surface over an underlying stone recharge bed. Porous pavement also known as permeable and pervious pavement is a stormwater management facility that allows water to move through void spaces within the pavement and eventually infiltrate into underlying soils.
Applicability porous asphalt allows for runoff volume and rate control, plus pollutant reductions. Porous asphalt is a developing in road surfacing technology. Porous asphalt pavements offer developers and planners a new tool in their toolbox for managing storm water. Porous asphalt pavements california coastal commission. Caltrans, greenbook, aashto, aci and astm test methods and material standards. Design and contruction of a porous asphalt stormwater bmp. The dissolved fractions of copper and zinc were higher in the runoff from porous asphalt overlay. Rainwater and snowmelt become runoff which may contribute to flooding. Moreover, permeable pavement has become a cornerstone of low impact development design and regulations. Porous asphalt pavement and infiltration beds design specifications page7 university of new hampshire stormwater center october 2009 b. The study of porous asphalt pavement with emphasis in road. Cstev porous asphalt spec university of new hampshire. Specific details on hydrological design are beyond the scope of this report. Design assessment checklists for permeableporous pavement.
Porous asphalt pavement is one alternative solution to the problem of stormwater. Unhsc design specifications for porous asphalt pavement and infiltration beds notice the specifications listed herein were developed by the unhsc for unhsc related projects and represent the authors best professional judgment. The hypothesis is that the installation of permeable pavements will be more costly initially compared to standard impermeable asphalt. Porous asphalt pavement next to impervious pavement.
Porous asphalt has been used successfully in parking lots, walkways, playgrounds and highvolume highways that carry heavy trucks. Porous asphalt, permeable pavers, flexible grids and gravel, on the other hand, all require rock for structural support, regardless of the type of native soils on which they will sit. They are used in wearing courses and always laid on impervious base course, was promising and effective in enhancing traffic safety. If damage to porous pavement occurs or if the condition of the porous pavement is deteriorating, contact dep. Unhsc design specifications for porous asphalt pavement. Porous asphalt pavement wisconsin asphalt pavement association.
In many cases, it can be used instead of conventional, impervious pavements for both vehicular and pedestrian traffic, without the need. First developed in the 1970s at the franklin institute in philadelphia, porous asphalt pavement consists of standard bituminous asphalt in which the aggregate fines particles smaller than 600, or the no. A porous asphalt bmp is a bmp where the surface is composed of an asphalt opengraded friction course ogfc manufactured with largerdiameter aggregates to achieve an effective porosity of approximately 19% by unhsc spec. Pdf rain water falling on the bituminous surfaces of parking lots, internal roads of various institutions etc. Debris includes acorns, seeds, branches, grass clippings, sandsediment, cigarette butts, trash, etc. Porous asphalt itself provides for some pretreatment of runoff. May 02, 2017 porous asphalt pavement can last up to twenty years before showing cracks or potholes.
The feasibility of using twinlayer porous asphalt surfaces. Design method used for structural design and provide calculations. Pervious pavement a term that includes pervious concrete, porous asphalt, permeable paver blocks and reinforced turf is an infiltration bmp that combines stormwater infiltration, storage, and structural pavement consisting of a permeable surface underlain by a storage or infiltration reservoir. Design and contruction of a porous asphalt stormwater bmp retrofit. Design and contruction of a porous asphalt stormwater bmp retrofit an epa education and outreach project author. Committee is working on a wsdot format specification for. The crushed aggregate filter layer aids with pollutant removal and provides stability for the stone reservoir layer during application of pavement.
Porous asphalt designed so that after laying and compacting, they form a surface with a voids more than 20 percent. For roads, other major benefits include reduced noise, increased wetweather friction and visibility, and reduced stormwater temperatures before discharge lebens 2012. Unhsc design specifications for porous asphalt pavement and. Presentation to the mystic river steering committees municipal subcommittee on november 15, 2012. Porous asphalt national asphalt pavement association. The use of porous asphalt also to reduce noise and glare sasana and ismanto, 2003. No assurances are given for projects other than the intended application. Benefits and uses porous asphalt can be used in replace of traditional stormwater management measures given the proper conditions. Permeable pavement options vary depending upon whether the pavement will receive light, moderate, or heavy use. Porous asphalt pavements with stone reservoirs fhwa.
They conserve water, reduce runoff, promote infiltration which cleanses stormwater, replenish aquifers, and protect streams. This specification is intended to be used for porous asphalt pavement in parking lot applications. Porous asphalt pavements 2004 information series 1. European experience with porous asphalt pavements and stone matrix asphalts smas indicates that these pavement surfaces can reduce noise generation. Civil construction management assistant professor, civil engineering department, ashokrao mane group of institutions, vathar.
Us epa, region 1, office of environmental stewardship subject. Porous asphalt pavement faqs flexible pavements of ohio. There are case studies of several examples of porous pavement installations that are still functioning well after 15 or 20 years. Recent research has identified permeable pavements as a cool pavement technology. Tech briefs on porous asphalt, pervious concrete and permeable interlocking concrete pavement available from the u. Pdf bituminous concrete is the surface layer which will be laid to ply the vehicles. Porous asphalt design overview porous pavements for new and redevelopment are a watershedbased strategy that can both mitigate impacts for new development and reverse impacts in areas with redevelopment. Solids, as well as some of the metals, were believed to be trapped in the porous asphalt overlay. When properly constructed, porous asphalt is a durable and cost competitive alternative to conventional asphalt. All other installations cited in this article are asphalt pavements. Projects use porous asphalt to meet postconstruction stormwater quantity and quality requirements. Also, we will also taking into account the hydrological differences of each pavements performance into our decision.
Design assessment checklists for permeableporous pavement 4 check dtcr summary details see note acceptable yn comments remedial actions cbr used in design and confirm it is appropriate to the soils below the site when wetted. If a stronger intervention is needed then maintenance and rehabilitation options need to be identified suitable for the distresses. Pavement thickness15 to 8 inches 3 to 4 inches 3 inches 1, 8. This would apply to both permeability life and structural life. Construction phasing should be performed as outlined in is 1 napa, 2003. Types of permeable pavement porous asphalt porous asphalt, developed about 1970, greatly resembles non. While there are several ways to make vehicular and pedestrian pavement permeable, the three primary technologies are porous asphalt, pervious concrete and permeable interlocking concrete pavement picp. Cost and benefit analysis of permeable pavements in water. Such pavements have been proving their worth since the mid1970s. An impervious pavement system, particularly parking lots, collect oil, antifreeze, and other pollutants that can then be washed into water. Design of longlife flexible pavements for heavy traffic.
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