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Leaching Assessment of MICP-Treated Coal Combustion Products in Roadways Embankment
Microbial induced calcium carbonate precipitation (MICP) is a promising technology to improve engineering properties of soil. The goal of this paper is to explore the possibility of using the MICP to treat coal combustion products to increase the mechanical strength and the limit the metal leaching from these products. Class C fly ash was used in the MICP treatment. Experimental results show that unconfined compressive strength (UCS) of MICP-treated fly ash samples increased from 1.3 MPa to 2.6 MPa when the fly ash content increased from 3% to 6% (by weight). However, the UCS of MICP-treated samples dropped to 0.07 MPa when the fly ash percent was up to 20%. Toxicity characteristic leaching procedure (TCLP) results showed that concentrations of boron, chromium, and lead decreased with fly ash in the MICP-treated sample. Compared to the fly ash sample without MICP, the MICP-treatment can limit the metal leaching with stronger bonding of precipitated calcium precipitation.
Leaching Assessment of MICP-Treated Coal Combustion Products in Roadways Embankment
Microbial induced calcium carbonate precipitation (MICP) is a promising technology to improve engineering properties of soil. The goal of this paper is to explore the possibility of using the MICP to treat coal combustion products to increase the mechanical strength and the limit the metal leaching from these products. Class C fly ash was used in the MICP treatment. Experimental results show that unconfined compressive strength (UCS) of MICP-treated fly ash samples increased from 1.3 MPa to 2.6 MPa when the fly ash content increased from 3% to 6% (by weight). However, the UCS of MICP-treated samples dropped to 0.07 MPa when the fly ash percent was up to 20%. Toxicity characteristic leaching procedure (TCLP) results showed that concentrations of boron, chromium, and lead decreased with fly ash in the MICP-treated sample. Compared to the fly ash sample without MICP, the MICP-treatment can limit the metal leaching with stronger bonding of precipitated calcium precipitation.
Leaching Assessment of MICP-Treated Coal Combustion Products in Roadways Embankment
Zhang, Junke (author) / Wen, Kejun (author) / Li, Lin (author)
Eighth International Conference on Case Histories in Geotechnical Engineering ; 2019 ; Philadelphia, Pennsylvania
Geo-Congress 2019 ; 273-279
2019-03-21
Conference paper
Electronic Resource
English
Leaching Assessment of MICP-Treated Coal Combustion Products in Roadways Embankment
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