A stoichiometric model was developed for predicting the amount of carbonate precipitation and gas production from two different biogeotechnical soil improvement techniques: enzyme-induced hydrolysis of urea and microbial denitrification. Carbonate precipitation via hydrolysis of urea, or ureolysis, and via dissimilatory nitrate reduction, or denitrification, has been shown in laboratory testing to improve the shear strength and cyclic resistance of granular soils. Desaturation via denitrification has also shown the ability to improve cyclic resistance. For effective implementation of these techniques in the field, it is important to understand the material requirements necessary to achieve the desired degree of improvement. Therefore, a model for predicting carbonate precipitation and gas production from these techniques was developed using stoichiometry, thermodynamics, and microbial growth patterns and calibrated with laboratory test data. The model will facilitate the implementation of cost-effective, non-intrusive, and sustainable ground improvement.

Original languageEnglish (US)
Pages (from-to)7-16
Number of pages10
JournalGeotechnical Special Publication
Issue number269 GSP
StatePublished - 2016
Event1st Geo-Chicago Conference: Sustainability and Resiliency in Geotechnical Engineering, Geo-Chicago 2016 - Chicago, United States
Duration: Aug 14 2016Aug 18 2016

ASJC Scopus subject areas

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


Dive into the research topics of 'A Stoichiometric Model for Biogeotechnical Soil Improvement'. Together they form a unique fingerprint.

Cite this