Geo-Congress 2020
Dissolution and Recrystallization of Iron Oxide during MICP
Publication: Geo-Congress 2020: Biogeotechnics (GSP 320)
ABSTRACT
An MICP field trial was performed at the Integrated Field-Scale Subsurface Research Challenge (IFRC) site, at Rifle, Colorado, USA. Non-destructive geophysical tests were used to monitor changes in soil properties as a function of time, while groundwater was sampled and tested for chemical indicators, including pH and dissolved iron content. During the field trial, the measured concentration of dissolved iron (Fe2+ ferrous iron) increased, which implied that the increased microbial activity resulted in dissolution of naturally occurring iron oxides, which are naturally occurring cementation agents. Column tests were performed to compare dissolved iron concentrations in the effluent of MICP tests performed in silty sands to sands with iron oxide. Release of ferrous iron was observed in the columns with iron oxide mineral phases; however, no observable differences were detected in the distribution of mass of calcite precipitated within the soil columns.
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ACKNOWLEDGEMENTS
This material is based upon work primarily supported by the Engineering Research Center Program of the National Science Foundation under NSF Cooperative Agreement Number EEC-1449501. Any opinions, findings and conclusions, or recommendations expressed in this material are those of the author(s), and do not necessarily reflect those of the NSF.
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Information & Authors
Information
Published In
Geo-Congress 2020: Biogeotechnics (GSP 320)
Pages: 179 - 187
Editors: Edward Kavazanjian Jr., Ph.D., Arizona State University, James P. Hambleton, Ph.D., Northwestern University, Roman Makhnenko, Ph.D., University of Illinois at Urbana-Champaign, and Aaron S. Budge, Ph.D., Minnesota State University, Mankato
ISBN (Online): 978-0-7844-8283-4
Copyright
© 2020 American Society of Civil Engineers.
History
Published online: Feb 21, 2020
ASCE Technical Topics:
- Chemical compounds
- Chemical elements
- Chemical properties
- Chemicals
- Chemistry
- Engineering fundamentals
- Environmental engineering
- Field tests
- Geology
- Geomechanics
- Geotechnical engineering
- Heavy metals
- Iron (chemical)
- Iron compounds
- Pollution
- Sandy soils
- Soil mechanics
- Soil pollution
- Soil properties
- Soil treatment
- Soils (by type)
- Subsurface environment
- Tests (by type)
Authors
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