From byproduct to co-product.

Since 1918, The NSA has promoted the use of Blast Furnace and Steel Furnace Slag. Blast Furnace slag has been called the "All-Purpose Aggregate" as it can be used in all construction applications as either a normal weight or lightweight (expanded or pelletized) aggregate depending on how it was formed and processed. Blast Furnace Slag is also quickly quenched by water or air to produce Granulated Blast Furnace Slag. When ground to cement fineness, GGBS (ground granulated blast slag) has been used extensively as a Portland cement replacement in concrete. Steel Furnace slag has been used in many construction applications and as a raw ingredient in Portland cement manufacture, but its primary use is as premium asphalt aggregate. These types of slag and the uses are covered extensively in numerous online documents and the applications matrix.

Slags are produced in many metallurgical operations throughout the world and are considered a co-product of the production of iron and steel. Slag is an environmentally sound material that has been used to aid in the remediation of many environmentally damaged areas such as Acid Mine Discharge. A copy of the Risk Assessment report is available in the environmental section of this website. Protect the environment. Think re-use and use slag, a renewable resource, in your next Green project.