文献类型：期刊文献

英文题名：Mechanical Performance and Microscopic Mechanism of Coastal Cemented Soil Modified by Iron Tailings and Nano Silica

作者：Song, Xinjiang[1];Xu, Haibo[1];Zhou, Deqin[2];Yao, Kai[3];Tao, Feifei[4];Jiang, Ping[2];Wang, Wei[2]

机构：[1]Anhui & Huaihe River Water Resources Res Inst, Dept Geotech Engn, Bengbu 233000, Peoples R China;[2]Shaoxing Univ, Sch Civil Engn, Shaoxing 312000, Peoples R China;[3]Shandong Univ, Sch Qilu Transportat, Jinan 250002, Peoples R China;[4]Shaoxing Univ, Sch Chem & Chem Engn, Shaoxing 312000, Peoples R China

年份：2021

卷号：11

期号：11

外文期刊名：CRYSTALS

收录：SCI-EXPANDED(收录号：WOS:000724048100001)、、Scopus(收录号：2-s2.0-85118928701)、WOS

基金：This research was funded by the National Natural Science Foundation of China, grant number 41772311, and the Shandong Provincial Natural Science Foundation, grant number ZR202102240826.

语种：英文

外文关键词：coastal cemented soil; nano silica; iron tailings; mechanical properties; microscopic mechanism

外文摘要：In order to explore the effect of composite materials on the mechanical properties of coastal cement soil, cement soil samples with different iron tailings and nano silica contents were prepared, and unconfined compression and scanning electron microscope tests were carried out. The results show that: (1) The compressive strength of cement soil containing a small amount of iron tailings is improved, and the optimum content of iron tailings is 20%. (2) Nano silica can significantly improve the mechanical properties of iron tailings and cement soil (TCS). When the content of nano silica is 0.5%, 1.5%, and 2.5%, the unconfined compressive strength of nano silica- and iron tailings-modified cement soil (STCS) is 24%, 137%, and 323% higher than TCS, respectively. (3) Nano silica can promote the hydration reaction of cement and promote the cement hydration products to adhere to clay particles to form a relatively stable structure. At the same time, nano silica can fill the pores in TCS and improve the compactness of STCS.