Research Article

THE EFFECTS OF DIFFERENT SOURCES OF CALCIUM IN IMPROVEMENT OF SOILS BY MICROBIALLY INDUCED CALCITE PRECIPITATION (MICP)

Volume: 37 Number: 3 September 1, 2020
  • Harun Akoğuz
  • Semet Çelik
  • Özlem Barış

THE EFFECTS OF DIFFERENT SOURCES OF CALCIUM IN IMPROVEMENT OF SOILS BY MICROBIALLY INDUCED CALCITE PRECIPITATION (MICP)

Abstract

Several soil improvement techniques are successfully implemented today. Studies are increasingly becoming popular on microbially induced calcite precipitation (MICP) as an environment-friendly and sustainable method that is an alternative to other soil improvement techniques. Our study examined the effects of different sources of calcium on an improvement that was carried out on a sand soil with a 35% relative density by using the MICP method. The results were analyzed by using unconfined compression, permeability, calcite formation percentage, pH, SEM (scanning electron microscopy) and XRD (x-ray diffraction) experiments. As a result of the unconfined compression test, the strength values were obtained as 2406 kPa in the specimens where calcium chloride was used as a calcium source, 2435 kPa in the specimens where calcium nitrate was used and 64 kPa in the specimens where calcium acetate was used. The permeability experiment revealed a decrease in permeability of 80.8% for calcium chloride, 23% for calcium nitrate and 90.4% for calcium acetate. According to the results of the SEM analyses, the structures that formed in all specimens bound the grains to each other and coated the surfaces of the grains. In the XRD analyses, calcite formation was observed in the specimens where calcium chloride and calcium nitrate were used as the source, while, in contrast, vaterite formations were also observed in the specimens where calcium acetate was used as the source. It was determined that different sources of calcium had different effects on improvement of sand soils by microbially induced calcite precipitation (MICP).

Keywords

References

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Details

Primary Language

English

Subjects

Engineering

Journal Section

Research Article

Authors

Harun Akoğuz This is me
0000-0001-9274-0249
Türkiye

Özlem Barış This is me
0000-0002-2679-5599
Türkiye

Publication Date

September 1, 2020

Submission Date

June 23, 2019

Acceptance Date

August 26, 2019

Published in Issue

Year 2019 Volume: 37 Number: 3

APA
Akoğuz, H., Çelik, S., & Barış, Ö. (2020). THE EFFECTS OF DIFFERENT SOURCES OF CALCIUM IN IMPROVEMENT OF SOILS BY MICROBIALLY INDUCED CALCITE PRECIPITATION (MICP). Sigma Journal of Engineering and Natural Sciences, 37(3), 953-965. https://izlik.org/JA64UJ47YF
AMA
1.Akoğuz H, Çelik S, Barış Ö. THE EFFECTS OF DIFFERENT SOURCES OF CALCIUM IN IMPROVEMENT OF SOILS BY MICROBIALLY INDUCED CALCITE PRECIPITATION (MICP). SIGMA. 2020;37(3):953-965. https://izlik.org/JA64UJ47YF
Chicago
Akoğuz, Harun, Semet Çelik, and Özlem Barış. 2020. “THE EFFECTS OF DIFFERENT SOURCES OF CALCIUM IN IMPROVEMENT OF SOILS BY MICROBIALLY INDUCED CALCITE PRECIPITATION (MICP)”. Sigma Journal of Engineering and Natural Sciences 37 (3): 953-65. https://izlik.org/JA64UJ47YF.
EndNote
Akoğuz H, Çelik S, Barış Ö (September 1, 2020) THE EFFECTS OF DIFFERENT SOURCES OF CALCIUM IN IMPROVEMENT OF SOILS BY MICROBIALLY INDUCED CALCITE PRECIPITATION (MICP). Sigma Journal of Engineering and Natural Sciences 37 3 953–965.
IEEE
[1]H. Akoğuz, S. Çelik, and Ö. Barış, “THE EFFECTS OF DIFFERENT SOURCES OF CALCIUM IN IMPROVEMENT OF SOILS BY MICROBIALLY INDUCED CALCITE PRECIPITATION (MICP)”, SIGMA, vol. 37, no. 3, pp. 953–965, Sept. 2020, [Online]. Available: https://izlik.org/JA64UJ47YF
ISNAD
Akoğuz, Harun - Çelik, Semet - Barış, Özlem. “THE EFFECTS OF DIFFERENT SOURCES OF CALCIUM IN IMPROVEMENT OF SOILS BY MICROBIALLY INDUCED CALCITE PRECIPITATION (MICP)”. Sigma Journal of Engineering and Natural Sciences 37/3 (September 1, 2020): 953-965. https://izlik.org/JA64UJ47YF.
JAMA
1.Akoğuz H, Çelik S, Barış Ö. THE EFFECTS OF DIFFERENT SOURCES OF CALCIUM IN IMPROVEMENT OF SOILS BY MICROBIALLY INDUCED CALCITE PRECIPITATION (MICP). SIGMA. 2020;37:953–965.
MLA
Akoğuz, Harun, et al. “THE EFFECTS OF DIFFERENT SOURCES OF CALCIUM IN IMPROVEMENT OF SOILS BY MICROBIALLY INDUCED CALCITE PRECIPITATION (MICP)”. Sigma Journal of Engineering and Natural Sciences, vol. 37, no. 3, Sept. 2020, pp. 953-65, https://izlik.org/JA64UJ47YF.
Vancouver
1.Harun Akoğuz, Semet Çelik, Özlem Barış. THE EFFECTS OF DIFFERENT SOURCES OF CALCIUM IN IMPROVEMENT OF SOILS BY MICROBIALLY INDUCED CALCITE PRECIPITATION (MICP). SIGMA [Internet]. 2020 Sep. 1;37(3):953-65. Available from: https://izlik.org/JA64UJ47YF

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