CS20 sprayed steel fiber concrete made from ferrous mill tailings

The invention relates to CS20 sprayed steel fiber concrete made from ferrous mill tailings. The CS20 sprayed steel fiber concrete comprises 10-14 wt% of cement, 1.4-1.8 wt% of silicon powder, 2.8-3.8 wt% of fly ash, 28-36 wt% of broken stones, 36-42 wt% of the ferrous mill tailings, 1.2-2 wt% of steel fibers, 8-9 wt% of water, 0.04-0.08 wt% of a polycarboxylic water reducer and 1.2-1.4 wt% of a setting accelerator. The ferrous mill tailings can completely substitute natural river sands, so the over-exploitation of the natural river sands is effectively reduced, and the ferrous mill tailings and other mine wastes can be maximally consumed by combining the region advantage of an iron producing region. The steel fibers adopted in the invention remarkably improves the tensile strength, the flexural strength and the adhesion of concrete and greatly improves the structure toughness. 本发明涉及利用铁尾矿砂配制的CS20喷射钢纤维混凝土，各组分及其重量百分比为：水泥用量：10～14％；硅粉用量：1.4～1.8％；粉煤灰用量：2.8～3.8％；碎石用量：28～36％；铁尾矿砂用量：36～42％；钢纤维用量：1.2～2％；水用量：8～9％；聚羧酸减水剂