2. It saves the energy ordinarily used to manufacture Portland cement
3. It needs 10% less water than traditional concrete
Because less water is used with high fly ash concrete, and because of the chemical reaction between the fly ash and lime which is given off in cement hydration, the end product is denser and stronger than traditional Portland cement-based concrete. Fly ash is made up of tiny, glassy beads; its physical composition creates a lubricating effect which enables the concrete to flow and pump better, filling the forms more completely. Additionally, high-fly ash concrete costs the same as or sometimes slightly less than traditional concrete.
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Here’s a picture of producer R. J. Bain from Discovery Home’s “Green That House” program filming the pour – they’ve been tracking the progress and filming various “green” elements as the remodel moves forward.