It's no big secret that the use of fly ash in concrete is on the upswing, and for good reasons. Fly ash can produce concrete with higher strength, lower permeability, and a lower carbon footprint. In 2007, Concrete Construction reported that "Wal-Mart Stores Inc. has changed their construction specifications to require all interior steel-troweled concrete floors placed at Wal-Mart Stores, Supercenters, Neighborhood Markets, Sam's Clubs, and Distribution Centers to contain 15% to 20% fly ash by cement substitution." Since then, the EPA has ruled in favor of fly ash, and it was discussed in-depth in a conversation between Tom Adams of the American Coal Ash Association and Concrete Construction Editor Bill Palmer at CC Live during 2015 World of Concrete.

Here' s a roundup of key fly ash-related articles and videos from Concrete Construction (in no particular order).