Journal of The Korean Society of Agricultural Engineers (한국농공학회논문집)

The Korean Society of Agricultural Engineers (한국농공학회)
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A Study on Cementation Reaction Mechanism for Weathered Granite Soil and Microbial Mixtures

화강풍화토와 미생물 혼합물의 고결 반응 메카니즘

  • Oh, Jongshin (GL Construction Co. Ltd.) ;
  • Lee, Sungyeol (Depart of Rural & Biosystems Engieering, Chonnam National University) ;
  • Kim, Jinyung (Korea Institute of Civil Engineering and Building Technology) ;
  • Kwon, Sungjin (Depart of Rural & Biosystems Engieering, Chonnam National University) ;
  • Jung, Changsung (Depart of Rural & Biosystems Engieering, Chonnam National University) ;
  • Lee, Jaesoo (Depart of Rural & Biosystems Engieering, Chonnam National University) ;
  • Lee, Jeonghoon (Depart of Rural & Biosystems Engieering, Chonnam National University) ;
  • Ko, Hwabin (Depart of Rural & Biosystems Engieering, Chonnam National University) ;
  • Baek, Wonjin (Department of Rural & Biosystems Engineering, Chonnam National University)
  • Received : 2019.10.07
  • Accepted : 2019.10.31
  • Published : 2019.11.30
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Abstract

The purpose of this study is to investigate the reaction mechanism of soil and bacteria solution by various mixing ratios. For this purpose, in order to understand the reaction mechanisms of microorganisms and weathered granite soil, the tests were carried out under various mixing ratios additives such as soil, bacteria solution, $Ca(OH)_2$ and fixture. The test results from this study are summarized as follows. Firstly, the reaction between the bacteria solution and fixture produced a precipitate called vaterite, a type of silicate and calcium carbonate. Secondly, as a result of SEM analysis, the resulting precipitates generated from the test results using the specimens with various mixing ratios except SW condition and the irregular spherical microscopic shapes were formed in the size of $150{\mu}m$ to $20{\mu}m$. In addition, it can be seen that the bacteria solution and the fixture reacted between the granules to form an adsorbent material layer on the surface, and the microorganisms had a biological solidifying effect when the pores are combined into hard particles. Finally, The XRD analysis of the sediment resulting from the reaction between the microorganism and the deposit control agent confirmed the presence of a type of calcium carbonate ($CaCO_3$) vaterite, which affects soil strength formation, as well as silicate($SiO_2$).

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References

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