The goal of this study is to expand the use of fly ash concrete (FAC). Based on an experimental investigation of the contributions of several FA combinations (k-values) to the strengths of ordinary Portland cement and of Portland blast-furnace slag cement type B, we propose an environmentally friendly formulation for the FAC mix proportion. A method for evaluating the performance of these FA combinations was also proposed. The mix proportion flow for FAC was examined and validated. As a result, basing the mix proportion of FAC on its k-value enables the design of appropriate and environmentally friendly FAC.
