Role of free iron oxides in the physicochemical and mechanical properties of natural clay
文献类型：期刊论文
| 作者 | Zhang, Xianwei1,4; Liu, Xinyu2,3,4; Kong, Lingwei4; Chen, Cheng4 |
| 刊名 | ENGINEERING GEOLOGY
 |
| 出版日期 | 2022-06-20 |
| 卷号 | 303期号:-页码:- |
| ISSN号 | 0013-7952 |
| 关键词 | Natural clay Iron oxides Microstructure Cementation Mechanical characteristics Occurrence |
| 英文摘要 | While it is widely acknowledged that interparticle bonding due to free iron oxide (FIO) dramatically affects the behavior of natural clay, the exact role of FIO in determining soil physicochemical and mechanical properties and the underlying mechanism remain unknown. In response, this study removes FIO from natural Zhanjiang clay, a structured marine clay with cementation, to investigate how FIO affects the physicochemical and mechanical behaviors of soil. The immersion method and leaching method (with dithionite-citrate-bicarbonate solution) are used for FIO removal. The test results indicate that the removal of FIO significantly changes the soil physical indices and degrades the mechanical properties. The effects of FIO removal are explained from the perspective of microstructural alterations as revealed by scanning electron microscopy (SEM) observations, mercury intrusion porosimetry (MIP) tests, energy-dispersive X-ray spectroscopy (EDS), and zeta potential measurements. FIO is distributed at the contacts between soil particles and exists in the bridging form. Due to the attraction between the positively-charged FIO and the negatively-charged clay mineral surfaces, soil particles are bounden to form larger soil aggregates with enhanced stability. The removal of FIO leads to the breakdown of soil aggregates and the generation of large pores, thereby increasing soil compressibility and decreasing the shear strength. This study provides some new micro-level understandings of how FIO affects the behavior of natural clay. |
| 学科主题 | Engineering ; Geology |
| 语种 | 英语 |
| 出版者 | ELSEVIER |
| WOS记录号 | WOS:000883166500002 |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/35344]  |
| 专题 | 中科院武汉岩土力学所 |
| 作者单位 | 1.State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, China 2.Key Laboratory of Environmental Change and Natural Disaster, Ministry of Education, Beijing Normal University, Beijing, China 3.University of Chinese Academy of Sciences, Beijing, China 4.State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, China |
| 推荐引用方式 GB/T 7714 | Zhang, Xianwei,Liu, Xinyu,Kong, Lingwei,et al. Role of free iron oxides in the physicochemical and mechanical properties of natural clay[J]. ENGINEERING GEOLOGY,2022,303(-):-. |
| APA | Zhang, Xianwei,Liu, Xinyu,Kong, Lingwei,&Chen, Cheng.(2022).Role of free iron oxides in the physicochemical and mechanical properties of natural clay.ENGINEERING GEOLOGY,303(-),-. |
| MLA | Zhang, Xianwei,et al."Role of free iron oxides in the physicochemical and mechanical properties of natural clay".ENGINEERING GEOLOGY 303.-(2022):-. |
入库方式： OAI收割
来源：武汉岩土力学研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。