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Abbasi, Mehdi. (1403). Experimental Study on Strength Properties of MICP-Treated Silty Sand. پژوهشنامه مدیریت اجرایی, 1(4), 28-34. doi: 10.22080/cste.2025.28436.1010
Mehdi Abbasi. "Experimental Study on Strength Properties of MICP-Treated Silty Sand". پژوهشنامه مدیریت اجرایی, 1, 4, 1403, 28-34. doi: 10.22080/cste.2025.28436.1010
Abbasi, Mehdi. (1403). 'Experimental Study on Strength Properties of MICP-Treated Silty Sand', پژوهشنامه مدیریت اجرایی, 1(4), pp. 28-34. doi: 10.22080/cste.2025.28436.1010
Abbasi, Mehdi. Experimental Study on Strength Properties of MICP-Treated Silty Sand. پژوهشنامه مدیریت اجرایی, 1403; 1(4): 28-34. doi: 10.22080/cste.2025.28436.1010

Experimental Study on Strength Properties of MICP-Treated Silty Sand

Contributions of Science and Technology for Engineering
مقاله 3، دوره 1، شماره 4، اسفند 2024، صفحه 28-34    اصل مقاله (1002.16 K)
نوع مقاله: Original Article
شناسه دیجیتال (DOI): 10.22080/cste.2025.28436.1010
نویسنده
Mehdi Abbasi*
Department of Civil Engineering, Faculty of Engineering, University of Guilan, Persian Gulf Highway, P.B, Rasht 41996‑13776, Guilan, Iran
تاریخ دریافت: 27 دی 1403،  تاریخ پذیرش: 29 دی 1403 
چکیده
Microbially induced carbonate precipitation (MICP) using ureolytic bacteria has emerged as a promising technique for geotechnical applications, including soil stabilization, land remediation, and groundwater control. This bio-mediated process relies on urease activity to hydrolyze urea, leading to calcium carbonate precipitation, which enhances soil strength and stiffness. In this study, the mechanical behavior of silica sand treated with MICP was investigated under varying cementation concentrations (µ) (0.25–1 mol/L), cementation ratios (β) (10–90%), and injection cycles (3, 14, and 21). Key parameters evaluated included unconfined compressive strength (UCS), secant modulus (E50), and calcium carbonate content. The results demonstrated a significant correlation between calcite content and mechanical properties, with optimal performance observed at 14.98% calcite content. This configuration yielded a UCS of 1030 kPa and an E50 of 389 MPa, achieved using Sporosarcina pasteurii, a β = 50%, and a µ = 0.75 mol/L over 21 days. Findings highlight the critical role of injection cycles and cementation concentration in achieving uniform calcium carbonate distribution and enhancing soil behavior. This study underscores the potential of MICP for tailored geotechnical solutions, providing valuable insights into optimizing bio-cementation processes.
کلیدواژه‌ها
MICP treatment؛ Sporosarcina pasteurii؛ Soil biological treatment؛ Unconfined compressive strength
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