Abstract: Concrete can be prepared by using the mechanochemically activated high-silicon iron tailings as an auxiliary cementing material to partially substitute cement. An experimental study was conducted to investigate the effects of tailings on resistance of concrete to carbonation and sulfate corrosion. Results show that when the substitution ratio is 10%， 20%， 30% and 40% respectively， the carbonation resistance of concrete becomes worse with the increasing of the substitution ratio， but still can meet the practical requirements of concrete structure; however， the sulfate corrosion resistance of concrete presents an upward trend with the increasing of the substitution ratio; when the substitution ratio is 20%， 30% and 40% respectively， the sulfate corrosion resistance of concrete is superior to the normal group. It is feasible to use mechanochemically activated high-silicon iron tailings as an auxiliary cementing material to prepare concrete.

Key words: high-silicon iron tailings, mechanochemical activation, concrete, carbonation, sulfate corrosion