1. Scope

Keywords

Rationale

This specification establishes a dedicated framework for electric furnace slag (EF slag) as a supplementary cementitious material in concrete. While ASTM C989/C989M provides a source-specific specification for slag cement and ASTM C1912/C1912M provides a general performance-based framework for SCMs, neither fully addresses the characteristics and qualification needs of EF slag. EF slag differs from traditional SCMs in origin, composition, and variability, and may contain phases that influence reactivity and dimensional stability. As such, this specification adopts a performance-based approach, using reactivity and expansion testing to qualify materials rather than relying solely on composition or origin. The standard is intended to support the technically sound use of EF slag in concrete and provide a consistent framework for producers, users, and specifiers.