All Issue

2013 Vol.29, Issue 2 Preview Page
A Study on the Mechanism of Soil Improvement Using Environment-friendly Organic Acid Material

친환경 유기산 재료를 활용한 지반개량 메커니즘에 관한 연구

Jong-Hwi Lee1
,
Jae-Won Jung2
,
Yun-Su Han1
,
Byung-Sik Chun3*
이 종휘1
,
정 재원2
,
한 윤수1
,
천 병식3*
1Researcher, Ocean Industry Research Dept. / Advanced Technology Institute Hyundai Heavy Industry
2Graduate student, Dept. of Civil and Environmental Engrg., Hanyang Univ.
3Prof., Dept. of Civil and Environmental Engrg., Hanyang Univ.
1현대중공업 중앙기술원 기반기술연구소 해양산업연구실 연구원
2한양대학교 건설환경공학과 석사과정
3한양대학교 건설환경공학과 교수
*교신저자. *Corresponding Author. 
28 February 2013. pp. 23-34
PDF XML Citation
Abstract

An organic acid material, which can be manufactured by plants extraction, encourages microbe proliferation over time. Microbial activity, which is affected by organic acid, encourages accelerating consolidation with biochemical penetration ; soil particles are compacted by microbes and pore water is dissipated quickly. Additionally, CaCO3 for cementation was made by proliferating microbes. Accordingly, tests were conducted to investigate the unconfined compressive strength and permeability of soil samples aged with and without an organic acid. In the 96 days of aging, the strength was generally 1.5∼2.5 times greater than those without an organic acid material and permeability was definitely decreased to 74.2∼93.1%. SEM analysis showed the change of pore structure and the change of the total bacteria counts revealed the activity of microbes reflecting the engineering characteristics and this material would be an environment-friendly for soil improvement.

Keywords
SEM
XRD

식물의 추출물로 제조할 수 있는 유기산 재료는 포설 시 지중 속에서 미생물의 증식을 유도하며, 미생물에 의해 지반에서 압밀을 가속화시키고 빠르게 간극수압을 소산시킨다. 추가적으로 일부 미생물에 의해 탄산칼슘을 생성시켜 공극을 채워 강도를 증대시키거나 투수성을 감소시킬 수 있다. 따라서, 본 연구에서는 유기산 재료의 지반개량 메커니즘 규명을 위하여 화강풍화토, 라테라이트성 적토에 유기산 재료 혼합 전 후의 강도와 투수시험을 실시하였으며, SEM, XRD로부터 원인을 규명하였다. 유기산 재료 혼합 후 재령 96일에서 강도는 약 1.5～2.5배 증가하였으며, 투수계수는 72.9～93.1%의 감소율을 보였다. SEM으로부터 흙 입자의 구조가 변하거나 공극이 감소한 것을 관찰하여 강도증대, 투수감소의 원인을 규명할 수 있었으며, XRD로부터 탄산칼슘의 생성도 고결화의 주된 요인이라고 결론내릴 수 있었다. 이에 본 유기산 재료는 친환경적으로 지반을 개량할 수 있는 공법으로 활용될 수 있을 것으로 보인다.

키워드
유기산재료
미생물
탄산칼슘
일축압축강도
투수계수
References
1
1.Chun, B. S. (2010), “Final Report about A Study on the Evaluation on Application of River Bank of Con-a Method”, Hanyang University, pp.1-15.
2
2.Clough, J. M., Peet, M. M., and Kramer, P. J. (1981), “Effects of high atmospheric CO2 and sink size on rates of photosynthesis of a soybean cultivar”, Plant Physiol. 67, pp.1007-1010.
3
3.Das, B. M. (1994), Principle of Geotechnical Engineering, 3rd edition, PWS Publishing Company, Boston, pp.67-87.
4
4.David, M. S., Jeffry, J. F., Peter, G. H., and David, A. Z. (2005). “Priciples and Applications of Soil Microbiology” 2nd edition. Pearson Prentice Hall, pp.33-50.
5
5.DeJong, J. T., Fritzges, M. B., and Nülein, K. (2006), “Microbially Induced Cementation to Control Sand Response to Undrained Shear”, Journal of Geotechnical and Geoenvironmental Engineering, pp. 1381-1392.
6
6.Do, J. N., Lee, J. H., Kim, J. W., Kim, K. M., Lee, J. K., Kim, Y. S., and Chun, B. S. (2010), Effect of Strength Increase of the Ground Using Polysaccharide Environmentally Friendly Soil Stabilizer, 2010 Korean Geo-Environmental Society Fall Conference, pp.97-101.
7
7.Ghosh, P., Mandal, s., Chattopadhyay, B. D., and Pal, S. (2005), “Use of microorganism to improve the strength of cement mortar”, Cement Concrete Research, Vol.35, No.10, pp.1980-1983.
8
8.Ghosh, S., Biswas, M., Chattopadhyay, B. D., and Mandal, S. (2009), “Microbial activity on the microstructure of bacteria modified mortar”, Cement and Concrete Composites, Vol.31, pp.93-98.
9
9.Hobbie, J. E., R. J. Daley, and S. Jasper, (1977), “Use of Nuclepore filters for counting bacteria by fluorescence microscopy”, Appl., Environ., Microbiol., Vol.33, pp.1255-1228.
10
10.Kim, S. T., Do, J. N., Jo, H. S., and Chun, B. S. (2011), “Effects of Ground Strength Increase using Polysaccharide Environmentally Friendly Soil Stabilizer”, The Journal of KGES, Vol.12, No.11, pp.13-21.
11
11.Kim, H. C. (2011), Cementation characteristcs of soil using Bacteria, Josun University Graduate school, Master’s thesis, pp.1-15.
12
12.Krebs, H. A. (1952), Symposium 3 (Citric Acid Cycle), 2nd Int., Congr. Biochem. Paris.
13
13.Lipus, L. C. and Dobersek, D. (2007), “Influence of magnetic field on the aragonite precipitation”, Chemical Engineering Science, Vol.62, pp.2089-2095.
14
14.Madigan, M. T. and Martinko, J. M. (2003), Brock biology of microorganisms, 11th ed., Prentice-Hall, Upper Saddle River, N.J.
15
15.Nebel, H. and Epple, M. (2008), “Continuous Preparation of Calcite, Aragonite and Vaterite, and of Magnesium-Substituted Amorphous Calcium Carbonate (Mg-ACC)”, Journal of Inorganic and General Chemistry, Vol.634, No.8, pp.45-57.
16
16.Osaki Corporation (2011), Construction manual for con-α (translated from Japanese). Osaki Corporation. http://www.osaki-c.co.jp. accessed 1 February 2011.
17
17.Park, S. S., Kim, W. J., and Lee, J. C. (2011), Effect of Biomineralization on the Strength of Cemented Sands, Journal of KGS, Vol.27, No.5, pp.75-84.
18
18.Ramakrishnan, V., Deo, K. S., Duke, E. F., and Bang, S. S. (1999), “SEM investigation of microbial calcite precipitation in cement”, Proc. Of 21st International Conference on Cement Microscopy, Las Vegas, NV, pp.406-414.
19
19.Ramakrishnan, V., Bang, S. S., and Deo, K. S. (1998), “A Novel Technique for Repairing Cracks in High Performance Concrete Using Bacteria”, Proc. of The Int. Conf. on HPHSC, Perth, Australia, pp.597-618.
20
20.Saxena, S. K. and Lastrico, R. M. (1978), “Static properties of lightly cemented sand”, Journal of Geotech. Engerg. Div., ASCE, Vol.104, No.12, pp.1449-1465.
21
21.Tittelboom, K. V., Belie, N. D., De Muynck, W., and Verstraete, W. (2010), “Use of bacteria to repair cracks in concrete”, Cement and Concrete Research, Vol.40, pp.157-166.
Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 29
  • No :2
  • Pages :23-34
  • Received Date : 2012-06-12
  • Accepted Date : 2013-01-25
  • DOI :https://doi.org/10.7843/kgs.2013.29.2.23
Journal Informaiton Journal of the Korean Geotechnical Society Journal of the Korean Geotechnical Society
Archives
: Vol.23~28 (2007~2012)
  • NRF
  • KOFST
  • KISTI Current Status
  • KISTI Cited-by
  • crosscheck
  • orcid
  • open access
  • ccl
Journal Informaiton Journal Informaiton - close