铁尾矿细粉在低熟料体系中对混凝土性能影响的试验研究  

Experimental Study on Effect of Iron Tailings Powder on Concrete Properties in Low Clinker System

作　　者：王欢 翁金红 刘娟红[2] 吴瑞东 WANG Huan;WENG Jinhong;LIU Juanhong;WU Ruidong(Anhui Magang Mining Resources Group Gushan Mining Co.,Ltd.,Maanshan,Anhui 213184,China;School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]安徽马钢矿业资源集团姑山矿业有限公司,安徽马鞍山市243184 [2]北京科技大学土木与资源工程学院,北京100083

出　　处：《矿业研究与开发》2022年第11期146-152,共7页Mining Research and Development

基　　金：国家自然科学基金重点项目(51834001).

摘　　要：针对铁矿山尾矿库中大量的尾矿细粉,研究铁尾矿细粉对混凝土性能的影响。选择不同比例的铁尾矿细粉和矿渣粉复合,在低水泥熟料体系下制备C30和C50混凝土,研究铁尾矿细粉对混凝土工作性能、力学性能和耐久性的影响,并利用扫描电镜观察混凝土内部结构。研究表明,当铁尾矿细粉和矿渣粉的比例为3∶7时,混凝土有较好的流动性,力学强度最佳,C30和C50混凝土的360d抗压强度分别达47.8MPa和74.9MPa,混凝土抗碳化和抗氯离子侵蚀能力与单掺矿渣粉混凝土相当,水化产物较多,微观结构致密。Aiming at a large amount of tailings powder in an iron ore tailings pond,the influence of tailings powder on concrete performance was studied.C30concrete and C50concrete were prepared with different proportions of iron tailings powder and slag powder in low cement clinker system.The influence of iron tailings powder on working performance,mechanical properties and durability of concrete was studied.The internal structure of concrete was observed by scanning electron microscope.The research shows that when the ratio of iron tailings powder to slag powder is 3∶7,the concrete has a good fluidity and a high later compressive strength.The compressive strength of C30concrete and C50concrete at 360days is 47.8MPa and 74.9MPa,respectively.The abilities of anti carbonization and anti chloride ion corrosion of the new concretes are equivalent to that of the concrete mixed with slag powder alone,with more hydration products and dense microstructure.

关 键 词：铁尾矿细粉 混凝土 低熟料 抗压强度 耐久性 

分 类 号：TD926.4[矿业工程—选矿] TU528[建筑科学—建筑技术科学]