QUIKRETE^® Bulk Slag Cement is a hydraulic cement made by grinding granulated blast furnace slag (GGBFS). GGBFS is a nonmetallic byproduct primarily created through the steel production process. The molten byproduct is water-quenched rapidly to form granules, which are then ground to a fineness similar to portland cement. Slag cement replaces portland cement in a one-to-one ratio by mass and can comprise of anywhere from 20 to 80 percent of the total cementitious content of a concrete mixture.

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