Are concrete's days of parking lot domination over? In the search to minimize urban runoff, erosion, and pollution to lakes and streams, many are looking to a new player in the wide world of pavement: Grasscrete. Consisting of 47% concrete and 53% holes -- where grass will supposedly grow -- the idea is to allow for normal absorption of rainwater back into the water table, and not down through storm drain.Basically, it works like this: developers pour concrete over 2'X4' blocks called 'formers,' which leave open spaces in the concrete as they biodegrade. Formers are made of recycled paper of course, similar to materials used in potting materials at plant nurseries. While permeable concrete seems to be an idea whose time has come, there are a few hurdles for Grasscete to clear before it saves the planet.
Grasscrete is 30% more expensive than traditional concrete, although some would claim that it saves money on excavation and drainage system costs. My biggest question, is whether grass will actually grow in the concrete -- and what if it doesn't? Either way, as we've seen cities have to deal with extensive flooding recently, this stuff could be very valuable if it's used extensively.
No comments:
Post a Comment