Stabilization of Loess Using Nano-SiO2

被引:46
|
作者
Kong, Ran [1 ]
Zhang, Fanyu [1 ]
Wang, Gonghui [2 ]
Peng, Jianbing [3 ]
机构
[1] Lanzhou Univ, Dept Geol Engn, Key Lab Mech Disaster & Environm Western China, MOE, Lanzhou 730000, Gansu, Peoples R China
[2] Kyoto Univ, Disaster Prevent Res Inst, Res Ctr Landslides, Kyoto 6110011, Japan
[3] Changan Univ, Dept Geol Engn, Xian 710054, Shaanxi, Peoples R China
来源
MATERIALS | 2018年 / 11卷 / 06期
基金
中国国家自然科学基金;
关键词
loess; nano-SiO2; strength enhancement; structure modification; FLY-ASH; BEHAVIOR; NANOPARTICLES; LIME;
D O I
10.3390/ma11061014
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Improving the performance of loess is of significant importance for lowering its collapsibility and water sensitivity to construction requirements and for geohazard mitigation. The present paper studies the changes in mechanical, structural, and mineralogical properties of nano-SiO2-treated loess with different contents and curing days. The mechanical behavior was examined by unconfined compressive strength (UCS) of untreated and treated loess. To better understand the mechanisms of stabilization, particle size distributions, scanning electron microscope (SEM) images, and X-ray diffraction (XRD) analyses were carried out. The results show that the UCS increase with increasing contents and curing days due to nano-SiO2 addition produced coarser particles, denser packing, and smaller pores in treated loess. The changes in the properties can be attributed to the formation of aggregation and agglomeration, with greater particle sizes and more interparticle contact. In addition, the results from mineralogical component analysis further confirm that physical structure modification controls the changes in mechanical and fabric properties, rather than chemical component alteration. Even small nano-SiO2 additions can also provide great improvement when curing days are enough for the treated loess. These findings reveal that nano-SiO2 has the potential to serve as a cost-effective stabilized additive that treats the universal loess.
引用
收藏
页数:14
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