The most commonly used permeable pavement surfaces are pervious concrete, porous asphalt and permeable interlocking pavers. Examples of these three variants of permeable pavement are illustrated in Photos 1, 2 and 3.
Other variants not discussed in the articles on permeable pavement include single-sized aggregate, porous turf, permeable clay brick pavements, resin bound paving, and bound recycled glass porous pavement.
To assist with selection of the type of surface, a general comparison of the properties of the three major permeable pavement types is provided in Table 1. Designers should check with product vendors and the local review authority to determine specific requirements and capabilities of each system. Schematic cross sections of each system are illustrated in the design section for permeable pavement.
Summary of properties of permeable pavements.
Link to this table
|Properties||Pervious concrete||Porous asphalt||PICP|
|Typical pavement surface thicknessa||5 to 8 inches||3 to 4 inches (thicker for high wheel load applications)||3 inchesa|
|Bedding layera,f||None||1 in. AASHTO No. 57 stone||2 inches of AASHTO No. 8 stone (MnDOT 3127 FA-3)|
|Reservoir layerb,f||AASHTO No. 57 stone or per hydraulic design||AASHTO No. 2, 3, or 5 stone||4 inches of AASHTO No. 57 stone over No. 2, 3 or 4 stone|
|Installed surfacing costc||3 to $4/square foot||$2/square foot||3 to $4/square foot|
|Minimum batch size|
|Runoff temperature reduction|
|Surface colors/texture||Range of light colors and textures||Black or dark grey colors||Wide range of colors, textures and patterns|
|Load bearing capacitye|
|Surface cleaningg||Periodic vacuuming; replace jointing stones if completely clogged and uncleanable|
||Avoid winter sanding|
aThickness may vary depending on site and traffic conditions
bReservoir storage may be augmented by corrugated metal pipes, plastic arch pipe or plastic lattice crates
cSupply and install minimum surface thickness only; minimum 30,000 sf with Minnesota 2012 prevailing labor wages. Does not include base reservoir, drainage appurtenances, engineering, or inspection
dBased on pavement being properly maintained. Resurfacing or rehabilitation may be needed after the indicated period
eDepends primarily on on-site geotechnical considerations and structural design computations
f ASTM D448 Standard Classification for Sizes of Aggregate for Road and Bridge Construction or ASASHTO M-43
gPeriodic vacuuming frequency determined from inspection, intensity of use, and other potential sediment sources