Use of Supplementary Cementitious Materials for Concrete

By: Transportation Research Board and National Academies of Sciences, Engineering, and Medicine and National Cooperative Highway Research Program and Tara Cavalline and Jamshid Armaghani

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Synopsis: Supplementary cementitious materials (SCMs) are nonorganic additives used in concrete mixtures, either as a partial replacement of Portland cement in the mixture or as a preblended material with the cement. Commonly used SCMs include fly ash, slag cement, and silica fume. Due to the increasing unavailability of fly ash in many regions, state departments of transportation (DOTs) have been considering and using alternative SCMs. NCHRP Synthesis 656: Use of Supplementary Cementitious Materials for Concrete, from TRB’s National Cooperative Highway Research Program, documents state DOT practices for specifying and using SCMs in concrete.