As an added benefit, concrete made with the purified fly ash is also stronger than that made with pure cement. More specifically, when the scientists replaced 30% of the cement in a concrete ...

In fact, substituting fly ash for 20% to 25% of the Portland cement used in concrete mixtures has been proven to enhance the strength, impermeability, and durability of the final product.

Of the roughly 105 million tons of portland cement is used annually, there’s about 15 million tons of SCM – the majority of which is fly ash. Second is granulated blast furnace slag.

ALBANY — The state is poised to ban the use of mercury-tainted coal fly ash at a Ravena cement plant that is the state's second largest source of airborne mercury pollution. During a hearing ...

Fly ash facts. Lafarge uses between 30,000 and 60,000 tons of fly ash a year at its Route 9W plant in Ravena. Nationwide, the amount of fly ash burned to make cement has skyrocketed in the last ...