CAJ | 학술논문

通过正交试验来探讨影响铅锌尾矿和矿渣粉制备高强混凝土的因素，并利用XRD、SEM来分析水化产物及微观形貌。试验结果表明：①当矿渣粉磨60 min(比表面积为625．6 m2/kg)、铅锌尾矿和矿渣粉以1∶1的质量比混磨60 min(比表面积为719．1 m2/kg)、石膏掺量为胶凝材料总量的2%时可以制备出28 d抗压强度达到93．75 MPa的高强混凝土；XRD图谱和SEM图片显示，混凝土试件的早期强度主要来源于钙钒石的形成，养护期间体系中C-S-H凝胶生成量的增加，以及C-S-H凝胶与钙钒石紧密穿插在一起是后期强度增长的主要来源。②石膏过量会使体系不断生成钙钒石，钙钒石表面的电性能会发生吸水肿胀现象导致体系破裂，从而使混凝土的抗压强度降低。
통과정교시험래탐토영향연자미광화광사분제비고강혼응토적인소，병이용XRD、SEM래분석수화산물급미관형모。시험결과표명：①당광사분마60 min(비표면적위625．6 m2/kg)、연자미광화광사분이1∶1적질량비혼마60 min(비표면적위719．1 m2/kg)、석고참량위효응재료총량적2%시가이제비출28 d항압강도체도93．75 MPa적고강혼응토；XRD도보화SEM도편현시，혼응토시건적조기강도주요래원우개범석적형성，양호기간체계중C-S-H응효생성량적증가，이급C-S-H응효여개범석긴밀천삽재일기시후기강도증장적주요래원。②석고과량회사체계불단생성개범석，개범석표면적전성능회발생흡수종창현상도치체계파렬，종이사혼응토적항압강도강저。
Influence factors of high strength concrete made from lead-zinc tailings and slag powder were discussed by or-thogonal tests. Hydration products and their microstructure were analyzed by XRD and SEM. The results showed that:①high strength concrete with the compressive strength of 93. 75 MPa at 28 d were prepared when the slag was milled for 60 min(the specific surface 625. 6 m2/kg),and the mass ratio of the lead-zinc tailings to slag is 1 to 1 milling for 60 min(the specific sur-face 719. 1 m2/kg),and the gypsum accounts for 2% of the cementitious materials. The XRD spectrum and the SEM photo-graph indicated that the early strength of the concrete is derived from the AFt and the C-S-H gel generated increasingly during the curing time. Meanwhile the AFt closely surrounded by C-S-H gel contributed to the main strength increasing in later stage.②AFt will be constantly generated in the system when the dosage of gypsum is excessive,AFt surface will burst owing to ab-sorbing to much water,and then the compressive strength of concrete is decreased.