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The increasing environmental awareness warrants the requirement of investigation towards eco-friendly and sustainable ground improvement techniques. Microbial Induced Calcite Precipitation (MICP) is an innovative green technology that uses biological means to improve the engineering properties of geomaterials. The main conception behind this technique is to bind the soil particles together by Calcite (CaCO3) precipitated using microbial processes. Ureolysis or urea hydrolysis was one of the most efficient processes among all MICP methods of Calcite precipitation. In this study, two urease-positive microorganisms, namely, Sporosarcina Ureae and Bacillus Megatrium were introduced externally into the soil environment by hand mixing process to improve the engineering properties of a clayey soil collected from the surroundings of NIT Warangal campus. The urease activity of each of the microorganisms was studied using conductivity and optical density tests. The improvement in soil strength was studied by comparing the unconfined compressive strength (UCS) of the soil at different curing periods after MICP treatment with bacteria. The results show that both microorganisms can significantly improve the strength of the clayey soil.

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Study on Characterization of MICP Treated Clayey Soil

  • 会议论文

  • 发表日期：

    2025年

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  • Debdip Das,
  • Vineeth Reddy Karnati,
  • Kalyan Kumar Gonavaram,
  • Amitava Bandhu

摘要

The increasing environmental awareness warrants the requirement of investigation towards eco-friendly and sustainable ground improvement techniques. Microbial Induced Calcite Precipitation (MICP) is an innovative green technology that uses biological means to improve the engineering properties of geomaterials. The main conception behind this technique is to bind the soil particles together by Calcite (CaCO3) precipitated using microbial processes. Ureolysis or urea hydrolysis was one of the most efficient processes among all MICP methods of Calcite precipitation. In this study, two urease-positive microorganisms, namely, Sporosarcina Ureae and Bacillus Megatrium were introduced externally into the soil environment by hand mixing process to improve the engineering properties of a clayey soil collected from the surroundings of NIT Warangal campus. The urease activity of each of the microorganisms was studied using conductivity and optical density tests. The improvement in soil strength was studied by comparing the unconfined compressive strength (UCS) of the soil at different curing periods after MICP treatment with bacteria. The results show that both microorganisms can significantly improve the strength of the clayey soil.