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Effect of Ureolytic Bacteria on Compressibility of the Soils with Variable Gradation

Architecture, Civil Engineering, Environment
Volume 16 (2023): Issue 3 (September 2023)
By:
Open Access
|Oct 2023

Figures & Tables

Figure 1.

Grain size distribution curves of tested materials
Grain size distribution curves of tested materials

Figure 2.

The process of biomineralization in a flask: a) bacterial solution, b) bacterial solution right after CaCl2-urea solution added, c) calcite crystals precipitated at the bottom of the flask, where bacterial solution and cementation solution were mixed (after a few days of storing at room temperature)
The process of biomineralization in a flask: a) bacterial solution, b) bacterial solution right after CaCl2-urea solution added, c) calcite crystals precipitated at the bottom of the flask, where bacterial solution and cementation solution were mixed (after a few days of storing at room temperature)

Figure 3.

Results of oedometric tests of: a) untreated fine sand (FSa), b) fine sand (FSa) improved with the MICP method
Results of oedometric tests of: a) untreated fine sand (FSa), b) fine sand (FSa) improved with the MICP method

Figure 4.

Results of oedometric tests of: a) untreated fly ash (FA), b) fly ash (FA) improved with the MICP method
Results of oedometric tests of: a) untreated fly ash (FA), b) fly ash (FA) improved with the MICP method

Figure 5.

Results of oedometric tests of: a) untreated silt (Si), b) silt (Si) improved with the MICP method
Results of oedometric tests of: a) untreated silt (Si), b) silt (Si) improved with the MICP method

The parameters of tested soils

MaterialD50 (mm)ρs (g/cm3)Ip (%)
Silt (Si)0.0312.677.7
Fine sand (FSa)1.902.65–
Fly ash (FA)0.0602.18–

Chemical and phase composition of tested fly ash (FA)

Phase-mineral composition (%)Chemical composition (%)
SiO243.28Si22.37
Al2O331.81Al15.80
Fe2O31.82C3.49
CaO1.10K2.46
MgO2.16Fe1.87
K2O3.42Mg0.97
TiO20.63Ca0.81
LOI12.45Ti0.56
DOI: https://doi.org/10.2478/acee-2023-0040 | Journal eISSN: 2720-6947 | Journal ISSN: 1899-0142
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Language: English
Page range: 131 - 139
Submitted on: Apr 5, 2023
Accepted on: Apr 25, 2023
Published on: Oct 20, 2023
Published by: Silesian University of Technology
In partnership with: Paradigm Publishing Services
Publication frequency: 4 times per year
Keywords:
Biomineralization,
MICP,
Soil improvement,
Soil parameters,
Ureolytic bacteria
Related subjects:
Architecture and design,
Architecture,
Architects, buildings

© 2023 Mariola Wasil, Urszula Wydro, Elżbieta Wołejko, published by Silesian University of Technology
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

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