|RE: Pervious Concrete Paving||<– Date –> <– Thread –>|
|From: Prescott Nichols (pnicholsindigoarch.com)|
|Date: Fri, 6 Jan 2006 12:12:24 -0800 (PST)|
Good questions. Freeze-thaw: I do not have direct experience with pervious concrete in areas where the ground freezes. It may be that since water does not remain in the matrix it is not a problem, but maybe this is why you don't see pervious concrete taking over the northern states! Perhaps the Concrete Network has more information on this. Oil: As far as the oil goes, I can see how it would be more difficult to scrub out any discoloration from the pervious concrete. The only way to avoid discoloration altogether is to use an oil-based product like asphalt. If your question has more to do with pollution concerns than staining, I agree that it would make sense to use regular concrete in oil changing areas. Elsewhere, the matrix is more than adequate to capture minor leaks. Expense: For paths and smaller areas that would require manual (truck chute/wheel barrow) application, it costs about the same as regular concrete. There are some trade offs: placing the concrete involves a little more labor, because it is not as fluid as regular; however, there is no floating required, as that would reduce the permeability of the material. Larger areas, like parking lots, would probably be more expensive, because the material cannot be pumped, but then you can start realizing savings by eliminating storm drainage, including curbs and gutters, so parking lot costs tend to balance out as well. Other considerations: - Existing trees can be saved by using pervious concrete within their canopy. This alone makes pervious concrete the best option where parking must commingle with existing trees. - Something like 90% of hydrocarbon pollutants in storm water come from resurfacing of asphalt parking lots. Pervious never needs resurfacing and captures incidental hydrocarbon pollutants. Cheers! _____ Prescott Nichols, AIA Muir Commons, CA -----Original Message----- From: Michael Barrett [mailto:mbarrett [at] toast.net] Sent: Friday, January 06, 2006 10:42 AM To: 'Cohousing-L' Subject: RE: [C-L]_ Pervious Concrete Paving A question for Prescott: How does Pervious Concrete Paving perform when the water in those pores repeatedly freezes and thaws? Further it seems that the retention of (accidentally spilled dirty motor) oil in the pores of the material might be a possible disadvantage, making clean up even more difficult than solid concrete. Michael Barrett Liberty Village, Maryland, where we look forward to resuming building our community once we get our long delayed sewer taps. _________________________________________________________________ Cohousing-L mailing list -- Unsubscribe, archives and other info at: http://www.cohousing.org/cohousing-L/
- RE: Pervious Concrete Paving Michael Barrett, January 6 2006
- RE: pervious concrete paving truddick [at] earthlink.net, January 7 2006
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