Eighth International Conference on Case Histories in Geotechnical Engineering
Leaching Assessment of MICP-Treated Coal Combustion Products in Roadways Embankment
Publication: Geo-Congress 2019: Soil Improvement (GSP 309)
ABSTRACT
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.
Get full access to this article
View all available purchase options and get full access to this chapter.
REFERENCES
U.S. Environmental Protection Agency (U.S.EPA). Municipal solid waste-clean energy, 2014.
ASTM D2166/D2166M-13. (2013) Standard Test Method for Unconfined Compressive Strength of Cohesive Soil, ASTM International, West Conshohocken, PA
Zhao, Q., Li, L., Li, C.; Li, M., Amini, F., and Zhang, H. (2014a). “Factors Affecting Improvement of Engineering Properties of MICP-treated Soil Catalyzed by Bacteria and Urease.” J. of Materials in Civil Eng., ASCE,. 0001013, 04014094.
Zhao, Q., Li, L., Li, C., Zhang, H. and Amini, F. (2014b). “A Full Contact Flexible Mold for Preparing Samples Based on Microbial Induced Calcite Precipitation Technology.” Geotechnical Testing J., ASTM, 37(5), 1-5.
Li, M., Li, L., Ogbonnaya, U., Wen, K., Tian, A., and Amini, F. (2016). “Influence of Fiber Addition on Mechanical Properties of MICP-treated Sand.” J. of Materials in Civil Eng., ASCE,28(4), 04015166.
Li, Y., L. Li, S. Cordero-Zayas, F. Santos and J. H. Yaeger (2014). “Environmental impact of fly ash utilization in roadway embankments.” Journal of Material Cycles and Waste Management, 16(4): 591-596.
Rebata-Landa, V. (2007). “Microbial Activity in Sediments: Effects on Soil Behavior.” Ph.D. thesis, Georgia Institute of Technology, Atlanta, GA.
Wang, S., Q. Ma and Z. H. Zhu (2008). “Characteristics of coal fly ash and adsorption application.” Fuel, 87(15-16): 3469-3473.
Wen, K., C. Bu, S. Liu, Y. Li and L. Li (2018). “Experimental investigation of flexure resistance performance of bio-beams reinforced with discrete randomly distributed fiber and bamboo.” Construction and Building Materials, 176: 241-249.
Information & Authors
Information
Published In
Geo-Congress 2019: Soil Improvement (GSP 309)
Pages: 273 - 279
Editors: Christopher L. Meehan, Ph.D., University of Delaware, Sanjeev Kumar, Ph.D., Southern Illinois University Carbondale, Miguel A. Pando, Ph.D., University of North Carolina Charlotte, and Joseph T. Coe, Ph.D., Temple University
ISBN (Online): 978-0-7844-8211-7
Copyright
© 2019 American Society of Civil Engineers.
History
Published online: Mar 21, 2019
ASCE Technical Topics:
- Ashes
- Chemical processes
- Chemistry
- Coal
- Combustion
- Embankment (transportation)
- Energy engineering
- Energy sources (by type)
- Engineering materials (by type)
- Environmental engineering
- Fly ash
- Fuels
- Highway and road management
- Highway and road structures
- Highway transportation
- Highways and roads
- Infrastructure
- Leaching
- Materials engineering
- Non-renewable energy
- Pollution
- Soil pollution
- Soil treatment
- Transportation engineering
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.