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<p>Microbial-induced calcite precipitation (MICP) is an innovative technique that enhances the strength and stiffness of sand by leveraging natural biogeochemical processes. This study investigates the effects of MICP on the shear strength of the sandy-silt soil subjected to freezing and thawing cycles. The mechanical behaviour of MICP-treated soil was evaluated using bacteria and a cementation solution containing urea and calcium chloride at varying concentrations. To assess durability, soil samples underwent 15 continuous freezing and thawing cycles. Unconfined compressive strength tests were conducted after 3, 5, 7, 10, 12, and 15 cycles to measure the corresponding changes in shear strength. Results revealed that shear strength decreased as the number of cycles increased. Untreated soil exhibited a 72% reduction in shear strength after 10 freeze–thaw cycles, while MICP-treated soil, with a 600&#xa0;mmol/L cementation solution, showed only a 22.9% reduction. These findings highlight that MICP treatment significantly improved the soil’s resistance to freeze–thaw degradation, offering promising potential for geotechnical applications in cold regions.</p>

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Influence of Microbially Induced Calcite Precipitation on the Behaviour of Sandy-Silt Soil Under Freezing and Thawing Cycles

  • 期刊论文

  • 发表日期：

    2025年1月2日

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  • Radha Palpi Boruah,
  • Berlin Mohanadhas,
  • Jayakesh Kamalanathan

摘要

Microbial-induced calcite precipitation (MICP) is an innovative technique that enhances the strength and stiffness of sand by leveraging natural biogeochemical processes. This study investigates the effects of MICP on the shear strength of the sandy-silt soil subjected to freezing and thawing cycles. The mechanical behaviour of MICP-treated soil was evaluated using bacteria and a cementation solution containing urea and calcium chloride at varying concentrations. To assess durability, soil samples underwent 15 continuous freezing and thawing cycles. Unconfined compressive strength tests were conducted after 3, 5, 7, 10, 12, and 15 cycles to measure the corresponding changes in shear strength. Results revealed that shear strength decreased as the number of cycles increased. Untreated soil exhibited a 72% reduction in shear strength after 10 freeze–thaw cycles, while MICP-treated soil, with a 600 mmol/L cementation solution, showed only a 22.9% reduction. These findings highlight that MICP treatment significantly improved the soil’s resistance to freeze–thaw degradation, offering promising potential for geotechnical applications in cold regions.