Abstract:In this paper, fly ash SCC is prepared by replacing 40% cement with fly ash. The effect of its workability, basic mechanical properties and axial compression deformation properties with the volume fraction of steel fibers is studied. The parameters of axial compression stress-strain curve, such as ultimate stressσ_0, peak displacementε_0, strain energyV_ε and relative toughnessΓ, are further explored. The results showed that the workability of fly ash SCC decreases with the increase of the volume fraction of steel fibers. When the volume fraction of steel fibers is more than 0.75%, the workability decreases most obviously. The change of the volume fraction of steel fibers has no obvious effect on the compressive strength of fly ash SCC, but it can significantly improve its splitting tensile strength and flexural strength. When the volume fraction of steel fibers is 1.00%, the splitting tensile strength and flexural strength are increased by 14% and 12% respectively compared with SCC without steel fiber fly ash. The addition of steel fibers can significantly improve the axial compressive deformation properties of fly ash SCC. When the volume fraction of steel fiber is 0.50%, σ_0, ε_0, V_ε and Γ are increased by 3%, 35%, 53% and 49% respectively compared with SCC without steel fiber fly ash.