한국지반공학회논문집 (Journal of the Korean Geotechnical Society)

  • 제32권5호
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  • Pages.5-13
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  • 2016
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  • 1229-2427(pISSN)
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  • 2288-646X(eISSN)
한국지반공학회 (Korean Geotechnical Society)
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달걀껍질을 칼슘원으로 사용한 미생물 고결 모래의 공학적 특성

Engineering Characteristics of Cemented Sand with Microorganism Using Eggshell as Calcium Source

  • 투고 : 2016.02.16
  • 심사 : 2016.05.01
  • 발행 : 2016.05.31
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초록

요소 분해 미생물을 이용하여 흙 입자 사이에 칼사이트를 석출시킬 때 칼슘원이 필요하며, 일반적으로 염화칼슘을 칼슘원으로 사용하고 있다. 염화칼슘은 도로, 지반 및 주변 식물에 부작용을 일으키므로 본 연구에서는 버려지는 달걀껍질을 사용한 칼슘원을 개발하고자 하였다. 미생물에 기존 칼슘원인 염화칼슘 또는 식초로 달걀껍질을 분해하여 얻은 새로운 칼슘원을 혼합하여 모래 입자 사이에 칼사이트를 생성시킨 다음, 고결모래의 칼사이트 생성량, 투수계수 및 일축압축강도를 비교 분석하였다. 공시체 제작은 느슨한 상태의 Ottawa모래로 직경 5cm, 높이 10cm 공시체를 만든 다음 Sporosarcina pasteurii 미생물을 포함한 요소와 두 종류의 칼슘원을 1일 1회씩 30일 동안 주입하여 제작하였다. 칼슘원으로 달걀껍질을 사용한 경우 칼사이트 생성량은 평균 7.2%로 염화칼슘을 사용한 경우보다 1.2배 높았다. 또한 달걀껍질을 사용하여 고결시킨 공시체의 투수계수는 평균 3.82E-5cm/s로 7.7배 정도 감소하였으며, 일축압축강도는 평균 387kPa로 염화칼슘을 사용한 경우보다 1.2배 높았다. 한편, 칼슘원에 관계없이 칼사이트 생성량이 증가할수록 강도는 증가하고 투수계수는 감소하는 경향을 보였다.

A calcium source is necessary for calcite precipitation within soil particles by microbial decomposition of urea and a calcium chloride is usually used. The harmful environmental impact of calcium chloride on road, ground and plants is severe. In this study, an eggshell with vinegar is investigated for an environmental-friendly calcium source. Urea-decomposing microorganism and eggshell or calcium chloride as a calcium source are mixed with Ottawa sand to precipitate calcite. Then, the cemented sand with calcite is tested for calcite precipitation, permeability and unconfined compressive strength. A specimen is prepared by loose Ottawa sand in a size of 5 cm in diameter and 10 cm in height. A urea solution with Sporosarcina pasteurii and two different calcium sources is injected into the specimen once a day for 30 days. Calcite precipitated at average of 7.2% on the specimen with eggshell as a calcium source, which was 1.2 times more than that with calcium chloride. The permeability of a specimen with eggshell was at average of 3.82E-5 cm/s, which was 7.7 times lower than that with calcium chloride. Unconfined compressive strength of a specimen with eggshell was at average of 387 kPa, which was 1.2 times higher than that with calcium chloride. As more calcite precipitated, the strength increased while the permeability decreased, regardless of calcium sources.

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참고문헌

  1. Al Qabany, A. and Soga, K. (2013), "Effect of Chemical Treatement Used in MICP on Engineering Properties of Cemented Soils", Geotechnique, Vol.63, No.14, pp.331-339. https://doi.org/10.1680/geot.SIP13.P.022
  2. ASTM D4373-14 (2014), Standard Test Method for Rapid Determination of Carbonate Content of Soils", West Chnshohocken, PA, USA.
  3. Burbank, M, Weaver, T., Green, T., Williams, B., and Crawford, R. (2011), "Precipitation of Calcite by Indigenous Microorganisms to Strengthen Liquefiable Soils", Geomicrobiology Journal, Vol.28, No.4, pp.301-312. https://doi.org/10.1080/01490451.2010.499929
  4. Chang, K. C. S., McGinn, J. M., Weinhert, E. Jr., Miller, S. A., Ikeda, D. M., and Duponte, M. W. (2013), "Natural Farming: Water-Soluble Calcium", Sustainable Agriculture, pp.1-3.
  5. Choi, S. G. (2014), "Development of environment-friendly sand cementation using blast furnace slag and calcite precipitation", Ph.D. thesis, Kyungpook National University.
  6. Chu, J., Ivanov, V., and Stabnikov, V. (2012), "Microbially Induced Calcium Carbonate Precipitation on Surface or in the Bulk of Soil", Geomicrobiol. J., Vol.29, No.6, pp.544-549. https://doi.org/10.1080/01490451.2011.592929
  7. Chu, J., Ivanov, V., Stabnikov, V. and Li, B. (2013), "Microbial Method for Construction of an Aquaculture Pond in Sand", Geotechnique, Vol.63, No.10, pp.871-875. https://doi.org/10.1680/geot.SIP13.P.007
  8. Chung, J.S., Kim, B.H., and Kim, I.S. (2014), "A Case Study on Chloride Corrosion for the End Zone of Concrete Deck Subjected to De-icing Salts Added Calcium Chloride", Journal of the Korean Society of Safety, Vol.29, No.6, pp.87-93. https://doi.org/10.14346/JKOSOS.2014.29.6.087
  9. DeJong, J. T., Fritzges, M. B., and Nuslein, K. (2006), "Microbially Induced Cementation to Control Sand Response to Undrained Shear", J. Geotech. Geoenviron. Eng., Vol.132, No.11, pp.1381-1392. https://doi.org/10.1061/(ASCE)1090-0241(2006)132:11(1381)
  10. DeJong, J.T., Soga, K.S., Kavazanjian, E., Burns, S., van Paassen, L., Fragaszy, R., Al Qabany, A., Aydilek, A., Bang, S.S., Burbank, M., Caslake, L., Chen, C.Y., Cheng, X., Chu, J., Ciurli, S., Fauriel, S., Filet, A.E., Hamdan, N., Hata, T., Inagaki, Y., Jefferis, S., Kuo, M., Larrahondo, J., Manning, D., Martinez, B., Mortensen, B., Nelson, D., Palomino, A., Renforth, P., Santamarina, J.C., Seagren, E.A., Tanyu, B., Tsesarsky, M., and Weaver, T. (2013), "Biogeochemical Processes and Geotechnical Applications: Progress, Opportunities and Challenges", Geotechnique, Vol.63, No.4, pp.287-301. https://doi.org/10.1680/geot.SIP13.P.017
  11. Ivanov, V., Chu, J., Stabnikov, V., and Li, B. (2015), "Strengthening of Soft Marine Clay Using Bioencapsulation", Marine Georesources & Geotechnology, Vol.33, No.4, pp.320-324. https://doi.org/10.1080/1064119X.2013.877107
  12. Lechtanski, V.L. (2000), "Calcium Carbonate Content of Eggshells, Inquiry-Based Experiments in Chemistry", Oxford : New York, pp. 159-165.
  13. Mitchell, J. K. and Santamarina, J. C. (2005), "Biological Considerations in Geotechnical Engineering", J. Geotech. Geoenviron. Eng., Vol.131, No.10, pp.1222-1233. https://doi.org/10.1061/(ASCE)1090-0241(2005)131:10(1222)
  14. Park, S.S., Choi, S.G., and Nam, I.H. (2014), "Effect of Plant-Induced Calcite Precipitation on the Strength of Sand", Journal of Mater. Civ. Eng., Vol.26, No.8, 06014017. https://doi.org/10.1061/(ASCE)MT.1943-5533.0001029
  15. Shin, S. S., Park, S. D., Kim, H. S., and Lee, K. S. (2010), "Effects of Calcium Chloride and Eco-friendly Deicer on the Plat Growth", Korean Society of Environmental Engineers, Vol.32, No.5, pp.487-498.
  16. Van Paassen, L. A., Ghose, R., van der Linden, T. J. M., van der Star, W. R. L., and van Loosdrecht, M. C. M. (2010), "Quantifying Biomediated Ground Improvement by Ureolysis: Large-scale Biogrout Experiment", J. Geotech. Geoenviron. Eng., Vol.136, No.12, pp. 1721-1728. https://doi.org/10.1061/(ASCE)GT.1943-5606.0000382