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    Fly ash and power plant by-products

    In concrete, the fine, round particles of fly ash act like miniature ball bearings, improving the workability, water demand and compactibility of, for example, shotcrete and high performance concrete. The strength of the concrete is also significantly improved, as the particles of fly ash fill cavities in the concrete. Furthermore, the fly ash still strengthens the concrete even after many years as a result of its pozzolanic reaction with the cement and water in the concrete.