摘要
为研究硅粉和铁尾矿改性混凝土的基本特性,分别用硅粉和铁尾矿粉按照0~20%的比例替代水泥和河砂,并通过力学和氯离子侵蚀实验获得硅粉和铁尾矿粉的较优替代比;然后在此基础上,分别按照体积比为0~2%添加钢纤维、玄武岩纤维和剑麻纤维来改善混凝土的力学特性,结果表明:混凝土的抗压强度和抗拉强度随着硅粉和铁尾矿粉的增加先增后减,其中硅粉和铁尾矿粉的较优替代比分别为15%和10%。三种纤维都能有效地提高混凝土的抗压强度和抗拉强度,但降低混凝土的坍落度。掺入硅粉5%以及10%的铁尾矿粉可以提高混凝土的抗氯离子侵蚀性能,但过多的铁尾矿粉对混凝土的抗氯离子侵蚀性能不利;玄武岩纤维比钢纤维和剑麻纤维能更好地提高混凝土的抗氯离子侵蚀性能,SEM分析也获得相同的结论。
To study the basic characteristics of silica fume and iron tailings modified concrete,silica fume and iron tailings powder were used to replace cement and river sand at a ratio of 0%to 20%.The optimal replacement ratio of silica fume and iron tailings powder was obtained through mechanical and chloride ion erosion tests;then,on this basis,steel fiber,basalt fiber and sisal fiber were added in a volume ratio of 0~2%to improve the mechanical properties of concrete.The results showed that:the compressive strength and tensile strength of concrete increase first and then decrease with the increase of silica fume and iron tailing powder.The optimal replacement ratios of silica fume and iron tailing powder are 15%and 10%,respectively.Three kinds of fibers can effectively increase the compressive strength and tensile strength of concrete,but reduce the slump of concrete.The addition of 5%silica fume and 10%iron tailings powder can improve the corrosion resistance of concrete,but too much iron tailings powder is detrimental to the corrosion resistance of concrete;basalt fiber is better than steel fiber and sisal fiber in improving the chloride ion resistance of concrete;SEM analysis also obtained the same conclusion.
作者
杨慧
Yang Hui(Zhengzhou Business University,Zhengzhou,Henan,China)
出处
《矿产综合利用》
CAS
北大核心
2023年第2期197-204,共8页
Multipurpose Utilization of Mineral Resources
基金
国家自然科学基金项目(51374088)。
关键词
混凝土
硅粉
铁尾矿粉
氯离子侵蚀
纤维
SEM
Concrete
Silica fume
Iron tailings powder
Chloride ion attack
Fiber
SEM
