铁尾矿-钢渣-锂渣混凝土耐酸侵蚀性能研究  

Study on Acid Erosion Resistance of Iron Tailing-Steel Slag-Lithium Slag Concrete

作　　者：张延年[1] 刘安稳 汪青杰[2] 于洋[1] 刘文亮 ZHANG Yannian;LIU Anwen;WANG Qingjie;YU Yang;LIU Wenliang(School of Civil Engineering,Shenyang Jianzhu University,Shenyang,China,110168;School of Science,Shenyang Jianzhu University,Shenyang,China,110168)

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168 [2]沈阳建筑大学理学部,辽宁沈阳110168

出　　处：《沈阳建筑大学学报（自然科学版）》2024年第3期536-544,共9页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金重点项目(52234004);辽宁省重大科技专项项目(2020JH1/10300005)。

摘　　要：目的在混凝土中掺入铁尾矿、钢渣、锂渣,分析混凝土的耐酸侵蚀性能,实现铁尾矿、钢渣、锂渣高效资源化利用。方法将铁尾矿、钢渣、锂渣作为掺合料替代部分水泥,铁尾矿碎石和铁尾矿砂作为粗、细骨料制备混凝土;对制备的混凝土标准养护28 d后进行为期60 d的酸侵蚀试验;通过改变水胶比和水泥替代率分析其质量损失率、抗压强度损失率及侵蚀深度,利用MIP、SEM探究铁尾矿-钢渣-锂渣混凝土耐酸侵蚀的机理。结果掺入铁尾矿、钢渣、锂渣可以降低混凝土的质量损失率、抗压强度损失率和侵蚀深度;其中掺量为30%时,质量损失率为0.12%、抗压强度损失率为-7.8%、侵蚀深度为0.6 mm,均达到最低值;混凝土的质量损失率、抗压强度损失率和侵蚀深度随着水胶比的增大而升高。结论铁尾矿-钢渣-锂渣混凝土中铁尾矿、钢渣、锂渣发挥的填充作用和与水泥发生的二次水化反应使混凝土体系更加致密,很大程度上阻碍了酸的侵入;同时,二次水化消耗了易与酸反应的CH,生成了更稳定的C-S-H凝胶,表现出更好的耐酸侵蚀性能。This paper was proposed to analyze the acid erosion resistance of concrete and realize the efficient resource utilization by mixing iron tailings,steel slag and lithium slag in concrete.Iron tailings,steel slag and lithium slag were used as admixtures to replace part of the cement,and iron tailings crushed stone and iron tailings sand were used as coarse and fine aggregates to prepare concrete;The prepared concrete was subjected to standard curing for 28 days followed by acid erosion test for a period of 60 days;The mass loss rate,compressive strength loss rate and erosion depth were analyzed by changing the water-cement ratio and cement substitution rate,and the mechanism of acid erosion resistance of iron tailings-steel slag-lithium slag concrete was explored using MIP and SEM.The results showed that the incorporation of iron tailings,steel slag and lithium slag can reduce the mass loss rate,compressive strength loss rate and erosion depth of concrete;The lowest values of 0.12%mass loss,-7.8%compressive strength loss,and 0.6 mm erosion depth were achieved at a doping level of 30%;The rate of mass loss,rate of compressive strength loss and depth of erosion of concrete increased with the increase in water-cement ratio.Iron tailings-steel slag-lithium slag concrete in the iron tailings,steel slag,lithium slag to play the role of filling and secondary hydration reaction with the cement to make the concrete system more dense,to a large extent,to prevent the intrusion of acid;At the same time,the secondary hydration reaction consumed the CH,which is easily reacted with acid,and generated a more stable C-S-H gel,which showed better resistance to acid erosion.

关 键 词：铁尾矿 钢渣 锂渣 混凝土 酸侵蚀 

分 类 号：TU528[建筑科学—建筑技术科学]