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.

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 ...

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.

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 ...