What is fly ash?
Fly ash is a fine, glass-like powder recovered from gases created by coal-fired electric power generation.

Fly ash material is solidified while suspended in the exhaust gases and is collected by electrostatic precipitators or filter bags. Since the particles solidify while suspended in the exhaust gases.

History of fly ash utilization
Fly ash concrete was first used in the U.S. in 1929 for the Hoover Dam, where engineers found that it allowed for less total cement. It is now used across the world.

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