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What's Happening from Environmental Building News
September 1, 2008
Groups Set Mercury Limits for Flyash in Concrete
In 2006, the most recent year for which data is available, the U.S. produced 72 million tons of coal flyash, a waste material left over after coal is burned to generate electricity. While most of that flyash was put in landfills, about 15 million tons went into concrete, often as a substitute for the more carbon-intensive portland cement. Flyash is made largely of silica and lime, but it also contains trace amounts of heavy metals from the coal, including mercury....
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