Mechanical properties of self consolidating concrete blended with high volumes of fly ash and slag

The effect of high volumes of two supplementary cementitious materials (SCMs) (fly ash and slag) on the mechanical performance of self-consolidating concrete (SCC) was investigated. Binary and ternary mixes were prepared replacing 60–90% of the Portland cement in the control mix (cement = 415.1 kg/m3). Mix designs were selected such that a wide range of CaO/(SiO2 + Al2O3) was achieved. Results show that SCC containing high volumes of SCMs have similar engineering properties (compressive strength, elastic modulus, creep, shrinkage) as conventional SCC at later ages (⩾28 day). A novel efficiency expression was developed to predict compressive strength.