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How the calculator works is that it first engages the user to choose from a list of pre-set concrete mixes.

The percentage can then be altered for the percent of slag cement that is included in the mix.

Slag is usually a mixture of metal oxides and silicon dioxide.

However, slags can contain metal sulfides and elemental metals.

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Slag is the glass-like by-product left over after a desired metal has been separated (i.e., smelted) from its raw ore.

In many smelting processes, oxides are introduced to control the slag chemistry, assisting in the removal of impurities and protecting the furnace refractory lining from excessive wear. A good example is steelmaking slag: quicklime and magnesite are introduced for refractory protection, neutralising the alumina and silica separated from the metal, and assist in the removal of sulfur and phosphorus from the steel.

Slag run-off from one of the open hearth furnaces of a steel mill, Republic Steel, Youngstown, Ohio, November 1941.

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