Comments on: When It Rains… It Drains http://dcmetrocentric.com/2008/07/16/when-it-rains-it-drains/ New Buildings, Construction, Destruction, Planning, Real Estate, and Gossip as it happens in the Nation's Capital Fri, 21 Nov 2008 16:45:04 +0000 http://wordpress.org/?v=2.2.2 By: dd http://dcmetrocentric.com/2008/07/16/when-it-rains-it-drains/#comment-2479 dd Thu, 24 Jul 2008 20:30:56 +0000 http://dcmetrocentric.com/2008/07/16/when-it-rains-it-drains/#comment-2479 My first thought is, if the concrete allows water in, what happens when the water freezes? Turns out that this hasn't been fully tested in climates where the temperature regularly drops below freezing. http://www.perviouspavement.org/inspection%20and%20maintenance.htm <I>Questions have been raised about the freeze-thaw durability of pervious concrete. Even though most experience with pervious concrete has been in warmer climates, recently there have been several pervious concrete projects in colder climates. Pervious concrete in freeze-thaw environments must not become fully saturated. Saturation of installed pervious concrete pavement can be prevented by placing the concrete on a thick layer of 8-24 inches (200 to 600 mm) of open-graded stone base. Limited laboratory testing has shown that entrained air may improve the freeze-thaw durability even when the pervious concrete is in a fully saturated condition. However, the entrained air content cannot be verified by any standard ASTM test procedure.</I> My first thought is, if the concrete allows water in, what happens when the water freezes? Turns out that this hasn’t been fully tested in climates where the temperature regularly drops below freezing.

http://www.perviouspavement.org/inspection%20and%20maintenance.htm
Questions have been raised about the freeze-thaw durability of pervious concrete. Even though most experience with pervious concrete has been in warmer climates, recently there have been several pervious concrete projects in colder climates. Pervious concrete in freeze-thaw environments must not become fully saturated. Saturation of installed pervious concrete pavement can be prevented by placing the concrete on a thick layer of 8-24 inches (200 to 600 mm) of open-graded stone base. Limited laboratory testing has shown that entrained air may improve the freeze-thaw durability even when the pervious concrete is in a fully saturated condition. However, the entrained air content cannot be verified by any standard ASTM test procedure.

]]> By: sean http://dcmetrocentric.com/2008/07/16/when-it-rains-it-drains/#comment-2415 sean Wed, 16 Jul 2008 14:11:01 +0000 http://dcmetrocentric.com/2008/07/16/when-it-rains-it-drains/#comment-2415 very cool stuff! very cool stuff!

]]> By: poo poo http://dcmetrocentric.com/2008/07/16/when-it-rains-it-drains/#comment-2410 poo poo Wed, 16 Jul 2008 12:53:41 +0000 http://dcmetrocentric.com/2008/07/16/when-it-rains-it-drains/#comment-2410 i dunno. wouldn't it make the ground all soggy, and turn dc back into the swamp that it once was? i dunno. wouldn’t it make the ground all soggy, and turn dc back into the swamp that it once was?

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