铁尾矿泥对全尾矿混凝土强度及早期收缩性能的影响

摘要/Abstract

摘要： 为了最大程度地利用铁尾矿资源,实现混凝土的绿色可持续发展,本文采用铁尾矿泥作掺合料,铁尾矿碎石和铁尾矿砂分别作为粗、细骨料,配制强度等级为C30的全尾矿混凝土。将20%、30%和40%(质量分数)比表面积为320和432 m²·kg^-1的铁尾矿泥作为全尾矿混凝土掺合料,研究铁尾矿泥掺量和细度对混凝土工作性能、力学性能和早期收缩性能的影响。结果表明:当铁尾矿泥的细度为320~432 m²·kg^-1、掺量在20%~30%时, 与以粉煤灰为掺合料的常规混凝土相比,全尾矿混凝土劈裂抗拉强度提高了6.6%~12.8%,7 d收缩率减少了10.4%~26.3%。微观结构分析表明,当掺量在20%~30%时,铁尾矿泥作为掺合料可以提高混凝土的密实性,降低全尾矿混凝土的早期收缩。

关键词: 铁尾矿泥, 全尾矿混凝土, 早期收缩性能, 力学性能, 工作性能, 比表面积

Abstract: In order to maximize the utilization of iron tailings resources and achieve green and sustainable development of concrete, this article uses iron tailings mud as admixture, iron tailings crushed stone and iron tailings sand as coarse and fine aggregates to prepare full tailings concrete with a strength grade of C30. Using 20%, 30%, and 40% (mass fraction) iron tailings mud with a specific surface area of 320 and 432 m²·kg^-1 as total tailings concrete admixture, the effects of iron tailings mud content and fineness on the workability, mechanical properties, and early shrinkage performance of concrete were studied. The results show that when the fineness of iron tailings mud is 320~432 m²·kg^-1 and content is 20%~30%, compared with conventional concrete with fly ash as admixture, the splitting tensile strength of full tailings concrete is increased by 6.6%~12.8%, and 7 d shrinkage rate is reduced by 10.4%~26.3%. Microscopic analysis shows that when the content is between 20%~30%, iron tailings mud as an admixture can improve the compactness of concrete and reduce the early shrinkage of full tailings concrete.

Key words: iron tailings mud, full tailings concrete, early shrinkage performance, mechanical property, workability, specific surface area

中图分类号:

TU528

马欣蕊, 肖林林, 崔佳祺, 余子康, 杨明镜, 孙建恒. 铁尾矿泥对全尾矿混凝土强度及早期收缩性能的影响[J]. 硅酸盐通报, 2024, 43(8): 2975-2983.

MA Xinrui, XIAO Linlin, CUI Jiaqi, YU Zikang, YANG Mingjing, SUN Jianheng. Influence of Iron Tailings Mud on Strength and Early Shrinkage Performance of Full Tailings Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(8): 2975-2983.

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