用某钼尾矿制备高性能混凝土的试验

将钼尾矿、矿渣、水泥熟料、石膏进行机械力粉磨，制备胶凝材料，研究了胶凝材料掺量和砂率对混凝土力学性能的影响。结果表明，随着胶凝材料掺量的增加，混凝土的坍落度和混凝土试块的抗压强度均增大；随着砂率的增大，混凝土的坍落度和混凝土试块的抗压强度均先增大后减小。当胶凝材料和骨料质量比为1∶3.0，砂率为0.35时，养护28 d的混凝土试块的抗压强度达68.7 MPa。在钼尾矿胶凝材料体系中，C-S-H凝胶、AFt及氢氧化铁凝胶等水化产物相互交织，未参与反应的微细粒填充到体系的孔隙中，促进了胶凝材料强度的增长。

Research on Preparation of High Performance Concrete with Molybdenum Tailings

Cementitious materials is prepared with molybdenum tailings，slag，clinker and gypsum，which were milled separately.The effects of cementitious materials content and sand ratio on mechanical performance of the concrete were studied.The experiments indicated that，with cementitious materials content increasing，slump and compressive strength of the concrete increased.With sand ratio increasing，slump and compressive strength of the concrete increased first and then decreased.When the mass ratio of cementitious materials and aggregate is 1∶3 and sand ratio is 0.35，the compressive strength of molybdenum-tailing-based concrete is high up to 68.7 MPa at curing for 28 d.The hydration products of cementitious materials prepared with molybdenum tailings，C-S-H gel，ettringite and iron hydroxide gel were intertwined.Some fine grains which was not involved in the reaction were filled into the pore，so the compressive strength of cementitious materials was promoted.