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recycling Coal Ash in concrete

What is Coal Ash? 

Coal Ash is a byproduct from burning pulverized coal in electric power generating plants. During combustion, mineral impurities in the coal fuse in suspension and float out of the combustion chamber with the exhaust gases. As the fused material rises, it cools and solidifies into spherical glassy particles called fly ash

Because coal power is widely used, fly ash is one of the most abundant industrial byproducts on Earth. Fly ash can be used in concrete as a cement substitute. Not only does using fly ash in concrete prevent those heavy metals from being released back into the environment, it also keeps cement makers from mining new raw materials.

How is it beneficial to the concrete industry?

The use of fly ash in concrete can result in better workability, pumpability, cohesiveness, finish, ultimate strength, and durability. In addition, it also can make concrete cheaper for the consumer. 


Image Courtesy of: SEFA GROUP

The Use of Fly Ash in Concrete diverts millions of tons of ash from the landfills each year, increases the constructability and durability of concrete, serves as an alternative to energy-intensive Portland cement, and is recognized by the U.S. Green Building Council’s LEED rating system as a post-industrial recycled material.

Did you know...

Currently, more than 50% of the concrete placed in the U.S. contains fly ash!

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