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    Volume 50, Issue 1 (August 2021)

    Dynamic Properties of Biopolymer-Treated Loose Silty Sand Evaluated by Cyclic Triaxial Test

    (Received 3 March 2021; accepted 21 June 2021)

    Published Online: 26 August 2021

    CODEN: JTEVAB

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    Abstract

    Improvement in certain soil properties because of biopolymer treatment has been found to imply that it could help in liquefaction mitigation. In this study, the effect of confining pressure on cyclic strength properties of agar biopolymer treated and untreated silty sand has been explored so that their behavior at varying depths, subjected to varying overburden stress, could be known. The agar-treated and untreated soils subjected to effective confining stresses of 100, 150, and 200 kPa were tested under consolidated undrained, strain-controlled cyclic triaxial loading, keeping the other parameters constant. The pore water pressure response, stress-path behavior, and effect on dynamic soil parameters were studied. The excess pore pressure and secant shear modulus were found to increase with the increase in confining pressure, whereas there wasn’t much of an effect on damping characteristics. The confining pressure had a positive effect on treated soil subjected to cyclic loading in terms of strength and stiffness because of the densification caused from confinement. In addition, durability characteristics of the treated soil were evaluated by cyclic wetting and drying tests. The N2-Brunauer-Emmett-Teller surface area test revealed that the surface area and pore volume decreased upon treatment, the results of which were supported by scanning electron microscopy images also.

    Author Information:

    Smitha, S.
    Department of Civil Engineering, National Institute of Technology Calicut, Calicut, Kerala

    Rangaswamy, K.
    Department of Civil Engineering, National Institute of Technology Calicut, Calicut, Kerala


    Stock #: JTE20210141

    ISSN:0090-3973

    DOI: 10.1520/JTE20210141

    Author
    Title Dynamic Properties of Biopolymer-Treated Loose Silty Sand Evaluated by Cyclic Triaxial Test
    Symposium ,
    Committee D18