关键词: 铁尾矿, 高强混凝土材料, 混磨时间, 抗压强度

Abstract: Shougang Miyun iron tailings are classified according to a certain grading, the -0.08 mm tailings with cement clincer and gypsum are mixed ,ground and produced cementitious materials. And then the cementitious materials were mixed with aggregate of +0.08 mm iron tailings, and became high-strength concrete materials by adding water-reducing agent. Under a certain condition, the effects of the aggregate size, the third-level mixing and grinding time, and the water reducer dosage on the pressure-resistant strength of products were checked by the orthogonal tests. The results showed that the third-level mixing and grinding time is the major factor of affecting the product's strength. Under suitable conditions, the producld concrete materials 28 d obtained the compressive strength as high as 97.63 MPa and the content of iron tailings in products reached 70%.

Key words: Iron tailings, High-strength concrete material, Mixing and grinding time, Pressure-resistant intensity