A good pros/cons view of Fly Ash in concrete. http://findarticles.com/p/articles/mi_gx5204/is_2003/ai_n19124302/?tag=content;col1 http://findarticles.com/p/arti

A good pros/cons view of Fly Ash in concrete. http://findarticles.com/p/articles/mi_gx5204/is_2003/ai_n19124302/?tag=content;col1 http://findarticles.com/p/articles/mi_gx5204/is_2003/ai_n191... And if it is radioactive (which I haven't seen referenced anywhere) then we're screwed because FA is used everywhere.