[1] Cheng Yongzhen, Huang Xiaoming,. Clay mineral expansion of black cotton soilbased on interlayer cation hydration [J]. Journal of Southeast University (English Edition), 2021, 37 (3): 299-305. [doi:10.3969/j.issn.1003-7985.2021.03.010]

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Clay mineral expansion of black cotton soilbased on interlayer cation hydration()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

37

Issue:

2021 3

Page:

299-305

Research Field:

Traffic and Transportation Engineering

Publishing date:

2021-09-20

Info

Title:

Clay mineral expansion of black cotton soilbased on interlayer cation hydration

Author(s):

Cheng Yongzhen¹;  2;  Huang Xiaoming¹

¹School of Transportation, Southeast University, Nanjing 210096, China
²Faculty of Architecture and Civil Engineering, Huaiyin Institute of Technology, Huai’an 223001, China

Keywords:

black cotton soil;  swelling characteristics;  clay minerals;  molecular simulation;  interlayer cation hydration

PACS:

U416

DOI:

10.3969/j.issn.1003-7985.2021.03.010

Abstract:

To analyze the water swelling characteristics of black cotton soil(BCS), X-ray fluorescence and X-ray diffraction characterizations were performed to investigate the chemical compositions and types of clay minerals in BCS. A montmorillonite crystal lattice was established to simulate the hydration of interlayer cations by applying the SPC/E potential energy model, universal force field, algorithm of charge balance, and periodic boundary. Results indicated that the main clay mineral found in the BCS was montmorillonite(32.6%)with small amounts of interstratified illite-montmorillonite(10.9%), illite(2.3%), and kaolinite(1.5%). The high expansive potential of BCS comes from the strong adsorption property of montmorillonite with a high content of magnesium and sodium ions to water molecules. The exchangeable cations of Na⁺ in BCS were only 3.73%, but they enhanced the adsorption capacity of clay to water molecules and accelerated the hydration of Mg²⁺(47.1%)and Ca²⁺(4.78%). The free swell index can be used as a classification index of the swelling potential of BCS.

References:

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Memo

Memo:

Biographies: Cheng Yongzhen(1982—), male, doctor; Huang Xiao-ming(corresponding author), male, doctor, professor, huangxm@seu.edu.cn.
Foundation items: The National Natural Science Foundation of China(No.51778139), Jiangsu Planned Projects for Postdoctoral Research Funds(No. 2020Z422).
Citation: Cheng Yongzhen, Huang Xiaoming.Clay mineral expansion of black cotton soil based on interlayer cation hydration[J].Journal of Southeast University(English Edition), 2021, 37(3):299-305.DOI:10.3969/j.issn.1003-7985.2021.03.010.

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