高硅型铁尾矿对混凝土碳化及抗硫酸盐腐蚀性能的影响

摘要 将某高硅型铁尾矿进行机械力化学活化，将其作为辅助胶凝材料部分取代水泥制备混凝土，取代量(质量分数)分别为10%，20%，30%及40%，开展高硅型铁尾矿对混凝土碳化及抗硫酸盐腐蚀性能影响的试验研究.结果表明，掺加尾矿的混凝土抗碳化性能低于基准混凝土，随着取代量的增加，混凝土抗碳化性能呈下降趋势，但能满足混凝土结构工程的实际要求;随着取代量的增加，混凝土抗硫酸盐腐蚀性能呈上升趋势，取代量为20%，30%及40%时，混凝土抗硫酸盐腐蚀性能优于基准混凝土.经过机械力化学活化，某高硅型铁尾矿作为混凝土辅助胶凝材料部分取代水泥制备混凝土，就混凝土抗碳化性能及抗硫酸盐腐蚀性能而言是可行的.
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.