铁尾矿-钢纤维双掺混凝土制备及性能研究  

Preparation and Performance Research of Iron Tailings-steel Fiber Double-mixed Concrete

作　　者：宁波[1] NING Bo(Shaanxi Railway Institute,Weinan 714000,China)

机构地区：[1]陕西铁路工程职业技术学院,陕西渭南714000

出　　处：《粉煤灰综合利用》2024年第3期16-19,44,共5页Fly Ash Comprehensive Utilization

基　　金：陕西省教育厅专项科研计划项目(18JK0179)。

摘　　要：铁尾矿长期堆积在尾矿库造成资源浪费和环境破坏,研究铁尾矿-钢纤维混凝土力学性能对开发利用铁尾矿具有重要意义。在混凝土中掺入铁尾矿和钢纤维,研究不同材料配比下混凝土的抗压强度变化。结果表明:铁尾矿掺量过低,生成的胶状聚合物较少,黏结作用较弱,铁尾矿掺量过高会导致混凝土含水量过高,均会降低混凝土抗压强度;钢纤维对混凝土抗压强度具有提升作用;氢氧化钠掺量与水胶比主要影响胶状聚合物的形成,分布均匀、充足的胶状聚合物可有效连接水泥基体和钢纤维,增强混凝土抗压强度;铁尾矿-钢纤维混凝土最优配比为铁尾矿掺量40%、45 mm长度钢纤维体积掺量2%、氢氧化钠掺量40%、水胶比0.2。The long-term accumulation of iron tailings in tailings ponds causes resource waste and environmental damage.Studying the mechanical properties of iron tailings steel fiber concrete is of great significance for the development and utilization of iron tailings.Add iron tailings and steel fibers to concrete to study the changes in compressive strength of concrete under different material ratios.The results show that if the content of iron tailings is too low,less gel like polymers are generated and the bonding effect is weak.If the content of iron tailings is too high,it will lead to a high water content in the concrete,which will reduce the compressive strength of the concrete;Steel fibers have an enhancing effect on the compressive strength of concrete;The dosage of sodium hydroxide and the water cement ratio mainly affect the formation of gel like polymers.A uniformly distributed and sufficient gel like polymer can effectively connect the cement matrix and steel fibers,enhancing the compressive strength of concrete;The optimal ratio of iron tailings to steel fiber concrete is 40%for iron tailings,2%for steel fiber volume of 45 mm length,40%for sodium hydroxide,and 0.2 for water cement ratio.

关 键 词：铁尾矿 钢纤维 混凝土 最佳配比 力学性能 

分 类 号：TU528[建筑科学—建筑技术科学]