矿物掺合料改良铁尾砂的力学特性研究

Study on Mechanical Properties of Stabilized Iron Tailings Mixed with Steel Slag and Slag Powder

为探究矿物掺合料替部分水泥稳定铁尾砂基层的力学特性,通过宏观力学试验测试,得到水泥—钢渣—矿粉复掺稳定铁尾砂的物理力学参数,并与水泥单掺稳定铁尾砂进行对比分析。研究结果表明:在水泥掺量14%情况下,水泥—钢渣—矿粉复掺稳定铁尾砂的7 d无侧限抗压强度均大于单掺水泥试验组;增加水泥或矿粉的掺量能够提高7 d无侧限抗压强度,而钢渣掺量的增加具有抑制作用;围压对于水泥—钢渣—矿粉复掺稳定铁尾砂的强化作用较水泥单掺的更为明显,黏聚力几乎相同,内摩擦角更大。

In order to explore the mechanical characteristics and curing mechanism of cement stabi⁃lized iron tailings base with mineral admixtures,the mechanical parameters and microscopic characteristics of cement-steel slag-mineral powder mixed stabilized iron tailings were obtained through macro-mechani⁃cal test,and compared with cement mixed stabilized iron tailings alone.The results show that when the ce⁃ment content is 14%,the 7-day unconfined compressive strength of cement-steel slag-mineral powder mixed with stabilized iron tailings is greater than that of the sole cement mixed test group.Increasing the con⁃tent of cement or mineral powder can improve the unconfined compressive strength of cement-steel slag mineral powder mixed stabilized iron tailings for 7 days,while the increase of steel slag content has an inhib⁃itory effect.The reinforcement effect of confining pressure on cement-steel slag-mineral powder mixed with stabilized iron tailings is more palpable than that of cement stabilized iron tailings,with almost the same co⁃hesion and larger internal friction angle.