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Performance of High-Volume Fly Ash Concrete in Hot Weather

A serious problem associated with modern portland cement concrete structures is thermal cracking, especially cast-in-place massive elements made with relatively high cement content and cured under hot weather conditions. From theoretical considerations and field tests it has been concluded that blended portland cement concrete mixtures containing 50% or more ASTM Class F fly ash by mass of the total cementitious material perform much better under these conditions.