Properties of permeable pavements. (Link to this table)
Properties | Pervious concrete | Porous asphalt | PICP |
---|---|---|---|
Typical pavement surface thickness1 | 5 to 8 inches | 3 to 4 inches (thicker for high wheel load applications) | 3 inches |
Bedding layer1,6 | None | 1 in. No. 57 stone | 2 inches of No. 8 stone |
Reservoir layer2,6 | No. 57 stone or per hydraulic design> | No. 2, 3, or 5 stone | 4 inches of No. 57 stone over No. 2, 3 or 4 stone |
Construction properties | Cast in place, seven day cure, must be covered | Cast in place, 24 hour cure | No cure period; manual or mechanical installation of pre-manufactured units |
Installed surfacing cost3 | $3 to $4/sf | $2/sf | $3 to $4/sf |
Minimum batch size | None | None | None |
Longevity4 | 20 to 30 years | 20 to 30 years | 20 to 30 years |
Overflow | Catch basin or overflow edge | Catch basin or overflow edge | Catch basin or overflow edge |
Runoff temperature reduction | Cooling at the reservoir layer | Cooling at the reservoir layer | Cooling at the reservoir layer |
Surface colors/texture | Range of light colors and textures | Black or dark grey colors | Wide range of colors, textures and patterns |
Load bearing capacity5 | Handles all vehicle loads with appropriate surface and base/subbase layer material and thickness design | Handles all vehicle loads with appropriate surface and base/subbase layer material and thickness design | Handles all vehicle loads with appropriate surface and base/subbase layer material and thickness design |
Surface cleaning7 | Periodic vacuuming; replace if completely clogged and uncleanable | Periodic vacuuming; replace if completely clogged and uncleanable | Periodic vacuuming; replace jointing stones if completely clogged and uncleanable |
Other issues | Avoid concentrated deicers and winter sanding | Avoid seal coating and winter sanding | Avoid winter sanding |
Design reference | ACI Report 522-2010 | Hansen 2008 NAPA | Smith 2011 ICPI |