Dissolution and Recrystallization of Iron Oxide during MICP

Junghwoon Lee, Susan Burns, Frederick Colwell, Dimitrios Ntarlagiannis, Juliette Ohan, Sina Saneiyan

Research output: Contribution to journalConference articlepeer-review

2 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)179-187
Number of pages9
JournalGeotechnical Special Publication
Volume2020-February
Issue numberGSP 320
DOIs
StatePublished - 2020
EventGeo-Congress 2020: Biogeotechnics - Minneapolis, United States
Duration: Feb 25 2020Feb 28 2020

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology
  • Building and Construction
  • Civil and Structural Engineering
  • Architecture

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