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What is slag cement (ground granulated blast furnace slag)?

Slag cement (also called ground granulated blast furnace slag) is a hydraulic cement produced during the reduction of iron ore to iron in a blast furnace.  Molten slag is tapped from a blast furnace, rapidly quenched with water ("granulated"), dried and ground to a fine powder.  The rapid quenching "freezes" the molten slag in a glassy state, which gives the product its cementitious properties.  For more information, see SCIC #1, "Slag Cement."