Interface and Performance of Iron Tailings‑Geopolymer Composites

被引：0
作者：
Lu J. [1 ,2 ]
Kong L. [1 ,2 ,3 ]
Fan Z. [2 ]
Xie S. [2 ]
机构：
[1] State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Shijiazhuang
[2] School of Materials Science and Engineering, Shijiazhuang Tiedao University, Shijiazhuang
[3] Hebei Key Laboratory of Advanced Materials for Transportation Engineering and Environment, Shijiazhuang Tiedao University, Shijiazhuang
来源：
Jianzhu Cailiao Xuebao/Journal of Building Materials | 2022年 / 25卷 / 06期
关键词：
geopolymer; impermeability; interfacial transition zone; iron tailings; mortar; strength;
D O I：
10.3969/j.issn.1007-9629.2022.06.006
中图分类号：
学科分类号：
摘要：
Iron tailings and natural sand were used to prepare cement/geopolymer mortar. The chemical reaction between the fine aggregate and the matrix， microstructure of interfacial transition zone （ITZ）， strength and impermeability of mortars were studied. The results show that the mass concentrations of Na+， Si4+， Al3+ and Ca2+ in both geopolymer solutions decrease after adding iron tailings powder. The reaction rate in the slag‑based geopolymer solution is faster， it plays a stronger role in promoting effect on the dissolution of surface layer of aggregate. The structure of ITZ near the iron tailings is obviously better than that of natural sand， especially in geopolymer mortar. The interfacial nanomechanical performance of iron tailing‑geoploymer are significantly higher than that of iron tailing‑cement mortar. The strength and impermeability of iron tailings mortar are also better than that of natural sand mortar. The difference is the smallest for cement mortar， and the most significant for slag‑based geopolymer mortar， while for the fly ash‑based geopolymer mortar the advantage of iron tailings can be seen only in the later stage. © 2022 Tongji University. All rights reserved.
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页码：585 / 590+606
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