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What specifications govern the use of slag cement in concrete?

Slag cement, when used as a separate component in a concrete mixture, is specified through ASTM C 989 Specification for Ground Granulated Blast-Furnace Slag for Use in Concrete and Mortar.  When used as a component in blended cement, one of two specifications are used:  ASTM C595, Specification for Blended Hydraulic Cements or ASTM C1157, Standard Performance Specification for Blended Hydraulic Cement.  For more information, see SCIC #12, "Terminology and Specifications" and SCIC #13, "Suggested Specifications for Slag Cement in Concrete."