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    Multiscale Study of Soil Stabilization Using Bacterial Biopolymers

    Access Status
    Fulltext not available
    Authors
    Ramachandran, Asha Latha
    Dubey, Anant Aishwarya
    Dhami, Navdeep
    Mukherjee, Abhijit
    Date
    2021
    Type
    Journal Article
    
    Metadata
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    Citation
    Ramachandran, A.L. and Dubey, A.A. and Dhami, N.K. and Mukherjee, A. 2021. Multiscale Study of Soil Stabilization Using Bacterial Biopolymers. Journal of Geotechnical and Geoenvironmental Engineering. 147 (8): 04021074.
    Source Title
    Journal of Geotechnical and Geoenvironmental Engineering
    DOI
    10.1061/(ASCE)GT.1943-5606.0002575
    ISSN
    1090-0241
    Faculty
    Faculty of Science and Engineering
    Curtin International
    School
    School of Civil and Mechanical Engineering
    CI Regional Deans
    URI
    http://hdl.handle.net/20.500.11937/84701
    Collection
    • Curtin Research Publications
    Abstract

    Conventional methods of soil stabilization employing materials, such as lime or cement, have considerable environmental penalties due to their high embodied energy. Alternatives such as biopolymers can significantly alleviate this problem. This paper is the first attempt to reveal the basic mechanism of stabilizing sand using bacterial biopolymer by conducting investigations spanning from microscopic to macroscopic scales. Xanthan gum, a bacterial biopolymer, has been microscopically characterized both as a stand-alone binder and with varying proportions of clay reinforcement. Sand columns have been produced using xanthan gum as the binder with varying quantities of clay. The biopolymer stabilized samples were characterized by strength and water absorption. Although xanthan gum was able to bind the sand, exposure to moisture considerably affected its strength. The addition of clay significantly improved the performance by reinforcing the polymer. The mechanism of stabilization has been revealed through advanced microscopic investigations using scanning electron microscopy, nanoindentation, and atomic force microscopy. The study reveals the potential of bacterial polymerization as a means of sustainable soil stabilization.

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