Abstract: In order to expand the application field of a vanadium-titanium magnetite tailings， the C₃₀ and C₃₅ self-compacting concrete were prepared by replacing the fly ash with the same volume of vanadium-titanium magnetite tailings fine powder， and the effect of tailings fine powder on concrete workability， mechanical properties， volume stability and hydration heat were studied. The test results showed that when the tailings fine powder replaced the fly ash with equal volume， the V-leakage time decreased and the divergence increased. The workability improved with the decrease of T500 time and the J-ring difference. The early compressive strength of the tailings fine powder concrete was higher than that of the fly ash concrete， and the 28 d compressive strength met the design requirements. The 56 d concrete volume shrinkage rate is within the controllable range， and the 7 d cumulative hydration heat of the tailings fine powder cementitious system is slightly lower than that of the fly ash.

Key words: Vanadium-titanium magnetite, Tailings, Fine powder, Self-compacting concrete, Mineral admixture