IDEAS home Printed from https://ideas.repec.org/a/gam/jsusta/v13y2021i5p2908-d512630.html
   My bibliography  Save this article

Improvement of the Salinized Soil Properties of Fly Ash by Freeze-Thaw Cycles: An Impact Test Study

Author

Listed:
  • Zhuo Cheng

    (College of Civil Engineering, Northeast Forestry University, Harbin 150040, China)

  • Gaohang Cui

    (College of Civil Engineering, Northeast Forestry University, Harbin 150040, China)

  • Zheng Yang

    (School of Automobile, Chang’an University, Xi’an 710064, China)

  • Haohang Gang

    (College of Civil Engineering, Northeast Forestry University, Harbin 150040, China)

  • Zening Gao

    (College of Civil Engineering, Northeast Forestry University, Harbin 150040, China)

  • Daili Zhang

    (College of Civil Engineering, Northeast Forestry University, Harbin 150040, China)

  • Chen Xi

    (College of Civil Engineering, Northeast Forestry University, Harbin 150040, China)

Abstract

To explore the mechanism of the microstructural change in salinized soil under freeze-thaw cycles and the strength characteristics of subgrade salinized soil improved by fly ash, an unconfined compressive test, a triaxial shear test, and a scanning electron microscopy test were carried out using salinized soil samples with different fly ash contents along the Suihua to Daqing expressway in China. The results showed that after several freeze-thaw cycles, the unconfined compressive strength, triaxial shear strength, cohesion, and internal friction angle of saline soil showed a decreasing trend. With an increase in the fly ash content, the internal friction angle, cohesion, unconfined compressive strength, and shear strength of the improved saline soil first increased and then decreased. When the fly ash content was 15%, the mechanical indexes, such as cohesion and the internal friction angle, reached the maximum value. Microscopic test results showed that the freeze-thaw cycle will lead to an increase in the proportion of pores and cracks, an increase in the average pore size, and a loosening of the soil structure. The addition of fly ash can fill the soil pores, improve the microstructure of the soil, increase the cohesive force of the soil particles, and improve the overall strength of the soil. Fly ash (15%) can be added to subgrade soil in the process of subgrade construction in the Suihua-Daqing expressway area to improve the shear strength and the resistance to freezing and thawing cycles. These research results are conducive to promoting the comprehensive utilization of fly ash, improving the utilization rate of resources, and promoting sustainable development, thus providing a reference for the design and construction of saline soil roadbed engineering in seasonal frozen areas and the development and construction of saline land belts in seasonal and winter areas.

Suggested Citation

  • Zhuo Cheng & Gaohang Cui & Zheng Yang & Haohang Gang & Zening Gao & Daili Zhang & Chen Xi, 2021. "Improvement of the Salinized Soil Properties of Fly Ash by Freeze-Thaw Cycles: An Impact Test Study," Sustainability, MDPI, vol. 13(5), pages 1-24, March.
    • Handle: RePEc:gam:jsusta:v:13:y:2021:i:5:p:2908-:d:512630
    as

    Download full text from publisher

    File URL: https://www.mdpi.com/2071-1050/13/5/2908/pdf
    Download Restriction: no
    File URL: https://www.mdpi.com/2071-1050/13/5/2908/
    Download Restriction: no
    ---><---

    References listed on IDEAS

    as
    1. Jilin Qi & Pieter A. Vermeer & Guodong Cheng, 2006. "A review of the influence of freeze‐thaw cycles on soil geotechnical properties," Permafrost and Periglacial Processes, John Wiley & Sons, vol. 17(3), pages 245-252, July.
    Full references (including those not matched with items on IDEAS)

    Most related items

    These are the items that most often cite the same works as this one and are cited by the same works as this one.
    1. Qianqian Zhao & Junzhen Li & Roman Fediuk & Sergey Klyuev & Darya Nemova, 2021. "Benefit Evaluation Model of Prefabricated Buildings in Seasonally Frozen Regions," Energies, MDPI, vol. 14(21), pages 1-18, November.
    2. Yangchun Han & Jiulong Cheng & Qiang Cui & Qianyun Dong & Wanting Song, 2020. "Uplift Bearing Capacity of Cone-Cylinder Foundation for Transmission Line in Frozen Soil Regions, Using Reduced-Scale Model Tests and Numerical Simulations," Energies, MDPI, vol. 13(8), pages 1-22, April.
    3. Chen Chen & Chaozhe Zhang & Xiao Liu & Xiaona Pan & Yenan Pan & Pengjiao Jia, 2023. "Effects of Freeze-Thaw Cycles on Permeability Behavior and Desiccation Cracking of Dalian Red Clay in China Considering Saline Intrusion," Sustainability, MDPI, vol. 15(4), pages 1-20, February.

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:gam:jsusta:v:13:y:2021:i:5:p:2908-:d:512630. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    If CitEc recognized a bibliographic reference but did not link an item in RePEc to it, you can help with this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: MDPI Indexing Manager (email available below). General contact details of provider: https://www.mdpi.com .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.