23 Aug '13, 2pm

Old Concrete Can Protect Nature #greenbuilding

Old Concrete Can Protect Nature #greenbuilding

“In the first app. six months, the water flowing through the filter has a high pH value. This is because the cement in concrete is alkaline, and therefore, the water that comes in contact with the cement, is also alkaline. This can be compared to the water that bricklayers often work with when they mix cement or limewash. “Water discharged to a lake or stream must not be this alkaline. In order to reduce its pH value, we add a little acid before we discharge it into the receiving water body. After running our full-scale experiment for approx. six months, enough cement has been washed out of the crushed concrete so that we no longer need to reduce the water’s pH value, and then I believe that the system can take care of itself,” says Melanie Sønderup.

Full article: http://greenbuildingelements.com/2013/08/23/old-concrete-...

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