Journal
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
Volume 31, Issue 12, Pages -Publisher
ASCE-AMER SOC CIVIL ENGINEERS
DOI: 10.1061/(ASCE)MT.1943-5533.0002959
Keywords
Microbially induced calcite precipitation (MICP); Wet-dry; Freeze-thaw; Acid rain; Environmental durability; Enhancement; Fiber reinforcement; Multiple treatments
Categories
Funding
- National Science Foundation [1531382]
- Natural Science Foundation of China [51668050]
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1531382] Funding Source: National Science Foundation
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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. Experimental results indicated that durability of MICP-treated soil was weak in wet-dry cycles, freeze-thaw cycles, and acid rain conditions. The unconfined compression strength (UCS) of MICP-treated soil had nearly 80% reduction after one wet-dry cycle, 58% reduction after 15 freeze-thaw cycles, and 83% reduction after 15 days immersed in acid rain solution with the pH of 3.5. 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 5 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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