Performance of MICP-Treated Soil against Environmental Deterioration
Publication: Geo-Congress 2023
ABSTRACT
Microbially induced calcite precipitation (MICP) is a sustainable biological ground improvement technology that is capable of improving the engineering properties of soil. A laboratory study was conducted to investigate the influence of some key environmental parameters on the long-term engineering performance of MICP-treated sandy soil, including wet-dry cycles, freeze-thaw cycles, and acid rain conditions, and to study the effect of enhancement through fiber reinforcement and multiple MICP treatments. Scanning electron microscopy, unconfined compression strength test, CaCO3 content, and mass loss measuring were conducted on treated samples. The results have shown that the strength of MICP-treated soil can be deteriorated by WD cycles. For FT cycle tests, the MICP-treated samples had better resistance at earlier stage, but the strength decreased severely along with more FT cycles. The MICP-treated samples were poor to resist acid rain erosion because of the dissolution of CaCO3 in acid. Fiber reinforcement and multiple MICP treatments were conducted to improve the resistance of MICP-treated sandy soil under environmental deteriorations. Fiber reinforcement mainly enhanced the ductility of MICP-treated samples. The failure strain of fiber-reinforced samples reached 1.6% compared with unreinforced samples of 0.4% after five wet-dry cycles. Multiple treatments enhanced the durability of MICP-treated samples. The UCS of multiple MICP-treated samples had no significant reduction after wet-dry and freeze-thaw cycles. For quadruple MICP-treated samples, a 51.9% UCS still remained after 15 days immersed in acid rain solution with the pH of 3.5.
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Geo-Congress 2023
Pages: 152 - 161
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Published online: Mar 23, 2023
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