大掺量铁尾矿高强混凝土材料的制备

将首钢密云铁矿尾矿按一定方法分级，取-0.08 mm粒级与水泥熟料、脱硫石膏通过三级混磨形成胶凝材料，然后将胶凝材料与作为骨料的+0.08 mm铁尾矿中的某一粒级混合，并加入减水剂制备成高强混凝土材料。在其他条件一定的情况下，通过正交试验着重考察了骨料粒度、第三级混磨时间、减水剂用量对制品抗压强度的影响。试验结果表明：第三级混磨时间是影响制品抗压强度的主要因素；在合适的条件下，制得的铁尾矿混凝土材料28 d抗压强度高达97.63 MPa，制品中铁尾矿掺量达到70%，。

Experimental Research On High-strength Concrete Preparation with Large Content of Iron Tailings

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 p...