Effect of CaCO3 microbiological precipitation on dune sand
Publish place: International Conference on civil engineering, architecture and urban development management in Iran
Publish Year: 1397
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:
CAUM01_0100
تاریخ نمایه سازی: 25 اردیبهشت 1398
Abstract:
Microbial induced calcite precipitation (MICP) is a novel ground improvement method to increase strength and reducing the hydraulic conductivity of sand using natural biogeochemical processes. This paper aims to study the effectiveness of MICP in improving the shear strength and hydraulic conductivity of dune sand. A species of Sprosarcina group, S. urea was used to trigger the calcite precipitation. Sand specimens were treated using of bacterial cell and urea– calcium chloride solutions. Measured strength and stiffness values from unconfined compression tests ranged for treated samples were 527.7 kPa and 69.43 MPa, respectively, while strength and stiffness values of control specimen (untreated sand) in triaxial condition (confining pressure 50 kPa) were measured 255.7 kPa and 25.5 MPa, respectively. Permeability coefficient value of treated sample was reduced 50.5% to treated sample by falling head test.
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Authors
m khaleghi
Msc, Department of Civil Engineering, Isfahan University of Technology,
m.a Rowshanzamir,
Associate Professor, Department of Civil Engineering, Isfahan University of Technology,
y Abdolvand
Msc Student, Department of Civil Engineering, Iran University of Science & Technology,