ABSTRACT
The term supplementary cementing materials (SCMs) denes a broad range of materials that are widely used in concrete in addition to portland cement.1 An SCM may be dened as “a material that, when used in conjunction with portland cement, contributes to the properties of the hardened concrete through hydraulic or pozzolanic activity, or both” (CSA A3001, 2003). As such SCMs include both pozzolans and hydraulic materials. SCMs that are commonly used in concrete today include y ash, ground granulated blast furnace slag, silica fume, and a wide range of natural pozzolans, such as volcanic ash, calcined clay or shale, and diatomaceous earth.
