26 Oct '12, 12pm

Reducing Environmental Impacts of Cement and Concrete - EBN: 19:9 via @sharethis

Fly ash may raise mercury contamination in demolition Posted by Brent Ehrlich on Sep 8, 2010, 11:36 PM Thanks for your comments, Tom. It's a complicated issue, for sure, and potential mercury contamination has to be taken seriously. The 2009 research cited in the article used fly ash concrete that was crushed by hammer until all of the sample fit through a 0.95 cm sieve, so it has some parallels to end-of-life disposal. The crushed material was then subjected to leaching tests using both acid as well as water similar to that found in the Eastern U.S. In one instance, less mercury leached from the fly ash concrete than the ordinary portland cement sample; and the average amount of mercury leached across all samples was 4.1 nanograms per liter. For comparison, the EPA drinking water standard is 2 micrograms (1000 nanograms = 1 microgram). While the results demonstrate that c...

Full article: http://www.buildinggreen.com/auth/article.cfm/2010/8/30/R...

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Fly ash may raise mercury contamination in demolition Posted by Brent Ehrlich on Sep 8, 2010, 11:36 PM Thanks for your com...

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