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

Mariola Wasil

Mariola Wasil

Bialystok University of Technology, Faculty of Civil Engineering and Environmental SciencesBialystok, Poland
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Wasil, Mariola
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Urszula Wydro

Urszula Wydro

Bialystok University of Technology, Faculty of Civil Engineering and Environmental SciencesBialystok, Poland
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Wydro, Urszula
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Elżbieta Wołejko

Elżbieta Wołejko

Bialystok University of Technology, Faculty of Civil Engineering and Environmental SciencesBialystok, Poland
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Wołejko, Elżbieta
  
20. Okt. 2023
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Online veröffentlicht: 20. Okt. 2023
Seitenbereich: 131 - 139
Eingereicht: 05. Apr. 2023
Akzeptiert: 25. Apr. 2023
DOI: https://doi.org/10.2478/acee-2023-0040
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© 2023 Mariola Wasil et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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

Material D50 (mm) ρs (g/cm3) Ip (%)
Silt (Si) 0.031 2.67 7.7
Fine sand (FSa) 1.90 2.65 –
Fly ash (FA) 0.060 2.18 –

Chemical and phase composition of tested fly ash (FA)

Phase-mineral composition (%) Chemical composition (%)
SiO2 43.28 Si 22.37
Al2O3 31.81 Al 15.80
Fe2O3 1.82 C 3.49
CaO 1.10 K 2.46
MgO 2.16 Fe 1.87
K2O 3.42 Mg 0.97
TiO2 0.63 Ca 0.81
LOI 12.45 Ti 0.56
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