Enzyme induced carbonate precipitation (EICP) for vertical columnar stabilization and soil nailing has been demonstrated in bench scale testing. In EICP, precipitation of calcium carbonate (CaCO3) is induced via hydrolysis of urea using free urease enzyme. The enzyme is introduced into the soil in an aqueous solution containing urea and calcium ions to precipitate CaCO3. The precipitated CaCO3 improves the strength and stiffness and increases dilatancy of the soil by filling soil pores, roughening the soil particles, and binding the particles together. EICP was used to improve soil around 51 mm- and 76 mm-diameter vertical perforated plastic pipes in 19 L buckets and a 1 m3 soil box, respectively. EICP solution was also injected through a 9.5-mm diameter perforated tube to create inclined columns to model soil nails. These tests demonstrate the feasibility of using EICP to create cemented soil columns for foundation support and soil nailing.

Original languageEnglish (US)
Pages (from-to)13-22
Number of pages10
JournalGeotechnical Special Publication
Issue number288 GSP
StatePublished - 2017
Event5th International Conference on Grouting, Deep Mixing, and Diaphragm Walls, Grouting 2017 - Honolulu, United States
Duration: Jul 9 2017Jul 12 2017

ASJC Scopus subject areas

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


Dive into the research topics of 'Bio-Inspired Soil Improvement Using EICP Soil Columns and Soil Nails'. Together they form a unique fingerprint.

Cite this