Evaluation of strength properties of clay treated by nano-SiO2 subjected to freeze-thaw cycles

被引：49
作者：
Changizi, Foad [1 ]
Ghasemzadeh, Hasan [2 ]
Ahmadi, Shervin [1 ]
机构：
[1] Islamic Azad Univ, Dept Civil Engn, South Tehran Branch, Tehran, Iran
[2] KN Toosi Univ Technol, Civil Engn Fac, Tehran, Iran
来源：
ROAD MATERIALS AND PAVEMENT DESIGN | 2022年 / 23卷 / 06期
关键词：
Freeze– thaw cycles; nano-SiO2; mMechanical properties; whiskers; clay;
D O I：
10.1080/14680629.2021.1883466
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Stabilisation by nanoparticles can be considered as an efficient method for enhancing the mechanical properties of clay exposed to the freeze-thaw cycles. The laboratory tests were conducted to understand the effects of various freeze-thaw cycles on clay treated with different percentages of nano-SiO2. In this paper, unconfined compressive strength (UCS) and shear resistance of soil, as well as the influencing mechanism of nano-SiO2 was evaluated.The results showed that nano-SiO2 leads to improve and prevent the resistance reduction of clay due to the freeze and thaw processes. After 9 cycles, the UCS and shear strength of clay treated with 1.0% nano-SiO2 were 16% and 21% more than natural clay which was not subjected to the freeze-thaw cycles. Scanning electron microscopy (SEM) images represent that nano-SiO2 produces whiskers under thermal stresses caused by freeze-thaw cycles. The whisker phenomenon leads to a significant increase in the mechanical properties of clay by creating filamentary networks.
引用
收藏
页码：1221 / 1238
页数：18
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