Greener Concrete Uses Power Plant Waste

Jun-19-18 A concrete binder made of waste from coal-fired power plants could lead to a greener cement alternative.

Concrete is a common building material, but its manufacture is an extremely large source of carbon dioxide emissions. And although recycled fly ash is already a common concrete binder, the amount of ash used is relatively small.

As a more effective alternative, the team from Rice University developed a composite binder made mostly of type C fly ash, which comes from lower grade coal and has a higher calcium content than the type F fly ash previously used. The type C ash binder mix requires very little sodium-based activators, and can account for 80 percent of the mix, rather than the much lower five to 20 percent typically used by the industry.

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