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• Site runoff and storm water quality requirements • Frost penetration depth – a factor in determining reservoir course thickness A typical porous asphalt pavement/recharge bed design consists of one or more porous asphalt courses; a top filter course; a reservoir course; filter fabric; and existing soil or sub-grade material. The porous asphalt courses consist of 2- to 4-inch-thick open-graded asphalt layers. Next, is a 2-inch- thick top filter course using 1/2-inch crushed stone (#57) aggregate. The filter course provides a firm paving platform. Without this layer, the single-size, open-graded aggregate may be unstable under the paver. The filter course also protects the reservoir course during placement of the asphalt mix. The depth of the reservoir is determined by the storage volume, structural capacity, or frost depth, whichever requires the greater thickness. The minimum depth of stone within the reservoir is usually 9 inches. Aggregates between 1.5 and 3 inches in size are recommended (#2); this size stone typically yields approximately 40 percent voids, which provides the runoff storage. A design guide, Porous Asphalt Pavements, Design, Construction & Maintenance Guide (IS-131), is available from the National Asphalt Pavement Association. Sample specifications for the porous asphalt materials have been developed by Flexible Pavements of Ohio. To find links to these documents and more information and articles regarding porous asphalt pavements, visit: www.flexiblepavements.org/sustainable _pav.cfm. OA Ohio Asphalt Winter 2008 15PDF Image | Porous Asphalt Pavement
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