Mineralogy of calcium carbonate in MICP-treated soil using soaking and injection treatment methods

T. Hamed Khodadadi, Edward Kavazanjian, Huriye Bilsel

Research output: Contribution to journalConference articlepeer-review

15 Scopus citations


Treatment method can have a significant influence on the mineralogy of the precipitated calcium carbonate (CaCO3) in soil treated by microbially-induced carbonate precipitation (MICP). Rhombohedral calcite crystals are the most desirable form of CaCO3 for geotechnical applications due to their thermodynamically stable nature. However, not all treatment methods produce this form of CaCO3. Soaking and injection are two methods for MICP treatment of soil commonly used in the laboratory. The injection method was found to be more efficient for obtaining rhombohedral calcite crystals. It appears that rhombohedral calcite crystal growth is hindered in the soaking treatment method due to high concentration of organic matter in the treatment solution. These results indicate that mineralogical considerations should be included when determining an appropriate method for MICP-treatment of soil in the laboratory such that the resulting specimen is representative of the in situ mechanical behavior of MICP-treated soil.

Original languageEnglish (US)
Pages (from-to)195-201
Number of pages7
JournalGeotechnical Special Publication
Issue numberGSP 277
StatePublished - 2017
EventGeotechnical Frontiers 2017 - Orlando, United States
Duration: Mar 12 2017Mar 15 2017

ASJC Scopus subject areas

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


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