Effect of Superhydrophobic Nano-SiO2 on the Geotechnical Characteristics of Expansive Soil
文献类型：期刊论文
| 作者 | Luo, Xiaoqian; Kong, Lingwei; Bai, Wei; Jian, Tao |
| 刊名 | JOURNAL OF TESTING AND EVALUATION
 |
| 出版日期 | 2022-11-01 |
| 卷号 | 50期号:6页码:2932 |
| 关键词 | superhydrophobic nano-SiO2 shrinkage expansion permeability unconfined compressive strength expansive soil |
| ISSN号 | 0090-3973 |
| 英文摘要 | The application of an environmentally friendly modifier-superhydrophobic nano-silicon dioxide (SiO2) on improving the geotechnical characteristics of expansive soil is explored to examine the effect of different percentages of superhydrophobic nano-SiO2 (0.2 %, 0.4 %, 0.6 %, 0.8 %, and 1.0 % by weight of the parent soil) on soil expansion, shrinkage, permeability, and unconfined compressive strength (UCS). Two types of samples, unmodified soil (without nano-SiO2) and modified soil (with nano-SiO2), were used. Results revealed that the shrinkage rate, the Expansion rate, and permeability decreased for the soil samples modified with different contents of superhydrophobic nano-SiO2 and the UCS increased. The shrinkage rate decreased from 3.8 to 2.2 %. The minimum expansion rate of the soil samples modified with superhydrophobic nano-SiO2 was a quarter of that of the unmodified soil. Permeability decreased gradually from 1.38 x 10-8 cm/s to 6.25 x 10-10 cm/s as the superhydrophobic nano-SiO2 content increased. The peak UCS (647 kPa) of modified soil increased by almost 212 % compared with that of the unmodified soil. Superhydrophobic nano-SiO2 helped improve the geotechnical character-istics of expansive soil. In the shrinkage and unconfined compressive tests, 0.6 % nano-SiO2 con-tent had a better effect on the modified soil. In the unloaded expansion and permeability test, the expansion rate and permeability decreased as the nano-SiO2 content increased. After the nano-SiO2 content reached 0.6 %, the decreasing speed became slow. The expansion rate and per-meability were similar when the nano-SiO2 contents were 0.6 %, 0.8 %, and 1.0 %, respectively. Therefore, the optimum superhydrophobic nano-SiO2 content was 0.6 %. |
| 学科主题 | Materials Science |
| 语种 | 英语 |
| WOS记录号 | WOS:000872929200001 |
| 出版者 | AMER SOC TESTING MATERIALS |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/34784]  |
| 专题 | 中科院武汉岩土力学所 |
| 作者单位 | 1.Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; 2.Chinese Academy of Sciences; Wuhan Institute of Rock & Soil Mechanics, CAS; 3.Chinese Academy of Sciences; Wuhan Institute of Rock & Soil Mechanics, CAS |
| 推荐引用方式 GB/T 7714 | Luo, Xiaoqian,Kong, Lingwei,Bai, Wei,et al. Effect of Superhydrophobic Nano-SiO2 on the Geotechnical Characteristics of Expansive Soil[J]. JOURNAL OF TESTING AND EVALUATION,2022,50(6):2932. |
| APA | Luo, Xiaoqian,Kong, Lingwei,Bai, Wei,&Jian, Tao.(2022).Effect of Superhydrophobic Nano-SiO2 on the Geotechnical Characteristics of Expansive Soil.JOURNAL OF TESTING AND EVALUATION,50(6),2932. |
| MLA | Luo, Xiaoqian,et al."Effect of Superhydrophobic Nano-SiO2 on the Geotechnical Characteristics of Expansive Soil".JOURNAL OF TESTING AND EVALUATION 50.6(2022):2932. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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