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Volume 46 Issue 11
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FU Guiyong, XIAO Yang, SHI Jinquan, ZHOU Hang, LIU Hanlong. Experimental study on degradation of EICP and xanthan gum treated calcareous silt under wetting-drying cycles[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(11): 2341-2351. DOI: 10.11779/CJGE20230748
Citation: FU Guiyong, XIAO Yang, SHI Jinquan, ZHOU Hang, LIU Hanlong. Experimental study on degradation of EICP and xanthan gum treated calcareous silt under wetting-drying cycles[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(11): 2341-2351. DOI: 10.11779/CJGE20230748
shu

Experimental study on degradation of EICP and xanthan gum treated calcareous silt under wetting-drying cycles

  • 1.

    School of Civil Engineering, Chongqing University, Chongqing 400045, China

  • 2.

    Key Laboratory of New Technology for Construction of Cities in Mountain Area, Chongqing University, Chongqing 400045, China

  • 3.

    National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas, Chongqing 400045, China

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  • Received Date: August 03, 2023
  • Available Online: April 17, 2024
    Graphical Abstract
    • Abstract
  • The biopolymer (BP) has been an emerging environment-friendly biomaterial for soil reinforcement in recent years. However, due to its water solubility, the strength of the BP-stabilized soil gradually deteriorates under cyclic wetting-drying conditions. Therefore, it is very important to improve the water resistance of the BP-strengthened soil. In this study, the calcareous silt in the South China Sea was reinforced by the plant urease-induced calcium carbonate precipitation (EICP) combined with the xanthan gum (XG). A series of physical, mechanical and microscopic tests are carried out on the samples under different wetting-drying cycles. The test results show that with the increase of the XG content and plant urease concentration, the unconfined compressive strength of the XG-stabilized soil and XG-EICP-stabilized soil increases significantly. With the increase of the wetting-drying cycles, the strength decrease of XG-stabilized soil is greater than that of the joint-stabilized soil, and the joint-stabilized soil has better resistance to the wetting-drying cycles. The results of the EICP and XG-EICP solution tests show that the XG can form a water-insoluble gel-like precipitate in the EICP solution, and the calcium carbonate particles attached to the XG-EICP precipitate are larger than those produced by the pure EICP. The tests verify the feasibility of the EICP to improve the erosion resistance of the biopolymer-solidified soils against the wetting-drying cycles, and it is expected to provide new ideas and methods for marine soil reinforcement.
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    • References (28)
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