摘要
为提高尾矿利用率和附加值,用铁尾矿粉取代粉煤灰作混凝土掺合料,通过干湿循环试验,研究铁尾矿粉混凝土抗硫酸盐侵蚀性,通过和以粉煤灰为掺合料的普通混凝土的抗压耐蚀系数对比分析,评估铁尾矿粉对混凝土耐硫酸盐侵蚀性能的影响。研究结果表明,所配制的铁尾矿粉混凝土至少可经受140次硫酸盐干湿循环侵蚀而不破坏,具有良好的耐硫酸盐侵蚀性。微观孔结构分析表明,铁尾矿粉的良好填充效应减少了混凝土中多害孔孔隙量,增大了混凝土的密实度。同时,铁尾矿粉的掺入降低了水泥用量及Ca(OH)2生成量,提高了铁尾矿粉混凝土的抗硫酸盐侵蚀性能。扫描电镜分析表明,硫酸盐侵蚀下铁尾矿粉混凝土中膨胀型产物增多,膨胀应力增大导致铁尾矿混凝土产生微裂缝,降低了混凝土强度。
In order to enhance the utilization ratio and added value of tailings,fly ash is replaced with iron tailing power as concrete admixture.Through the relevant dry-wet experiment,the sulfate corrosion resistance of the concrete mixed with iron tailing powder is studied herein,and then the influence from iron tailings powder on the sulfate corrosion resistance of concrete is evaluated through the comparative analysis made on the compressive corrosion resistance coefficient of the common concrete mixed with fly ash.The study results show that the concrete prepared with iron tailings powder can withstand at least 140 sulfate dry-wet cycles without damage,thus has a better sulfate corrosion resistance.The relevant microscopic pore structure analysis indicates that the better filling effect of iron tailings powder can reduce the porosity of harmful pores inside concrete and then increase the compactness of concrete,meanwhile,the mixing of iron tailings powder decreases both the content of cement and the generation of Ca(OH)2,thus increases the sulfate corrosion resistance of the concrete mixed with iron tailing powder.SEM analysis shows that the expansive products in the concrete mixed with iron tailings powder under sulfate corrosion are to be increased along with the increase of expansive stress,which is to lead to the formation of microcrack in the concrete mixed with iron tailing powder and then decreases the strength of the concrete.
作者
杨明镜
孙建恒
徐阳
王军林
YANG Mingjing;SUN Jianheng;XU Yang;WANG Junlin(College of Urban and Rural Construction,Hebei Agriculture University,Baoding 071001,Hebei,China;Hebei Water Conservancy Research Institute,Shijiazhuang 050000,Hebei,China)
出处
《水利水电技术（中英文）》
北大核心
2022年第11期177-185,共9页
Water Resources and Hydropower Engineering
基金
河北省重点研发计划项目(19211502D)。
关键词
铁尾矿粉混凝土
硫酸盐干湿循环侵蚀
抗压耐蚀系数
微集料填充效应
影响机理
iron tailing power concrete
sulfate dry-wet cycle corrosion
compressive corrosion resistance coefficient
micro-aggregate filling effect
influencing mechanism
