CUED Publications database

Microbial induced calcite precipitation for geotechnical and environmental applications

Dawoud, O and Chen, CY and Soga, K (2014) Microbial induced calcite precipitation for geotechnical and environmental applications. In: UNSPECIFIED pp. 11-18..

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Microbial Induced Calcite Precipitation (MICP) stands as a promising technique for modifying engineering characteristics of the soil including: strength, stiffness, and permeability. These modifications represent the requirements of several geotechnical and environmental applications. This paper studies the incremental changes in permeability correlated with the development in soil stiffness. Permeameter cells modified with s-wave bender elements were used to measure changes in permeability. The bender elements were used to continuously monitor the development in soil stiffness. A systematic study was performed to evaluate MICP product under different treatment conditions changing concentration of treatment solution, retention times and back pressure. Treatment concentrations from 0.25-1.0 M have been used, and the back pressure was applied at values between 0 and 100kPa while maintaining effective stress at 50 kPa for all experiments. Results have shown no notable changes in MICP changing pore water pressure. The major changes were ascribed to the concentration of chemicals used for treatment. At low calcite content, all treatment conditions lead to similar results for stiffness development and hydraulic conductivity reduction. Using high concentrations for treatment solutions resulted in earlier clogging that altered the manner by which soil acquires new characteristics. The outcomes presented by this paper provided a reference for evaluation of the proper use of MCIP. © 2014 American Society of Civil Engineers.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Divisions: Div D > Geotechnical and Environmental
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:06
Last Modified: 13 Oct 2020 03:28
DOI: 10.1061/9780784413456.012