Geomechanics and Engineering

  • 제12권5호
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  • Pages.803-813
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  • 2017
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  • 2005-307X(pISSN)
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  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

Application of magnesium to improve uniform distribution of precipitated minerals in 1-m column specimens

  • Putra, Heriansyah (Department of Civil and Environmental Engineering, Ehime University) ;
  • Yasuhara, Hideaki (Department of Civil and Environmental Engineering, Ehime University) ;
  • Kinoshita, Naoki (Department of Civil and Environmental Engineering, Ehime University) ;
  • Hirata, Akira (Department of Applied Chemistry, Ehime University)
  • 투고 : 2016.09.07
  • 심사 : 2017.02.16
  • 발행 : 2017.05.25
⟨ 이전 논문 다음 논문 ⟩

초록

This study discussed the possible optimization of enzyme-mediated calcite precipitation (EMCP) as a soil-improvement technique. Magnesium chloride was added to the injection solution to delay the reaction rate and to improve the homogenous distribution of precipitated minerals within soil sample. Soil specimens were prepared in 1-m PVC cylinders and treated with the obtained solutions composed of urease, urea, calcium, and magnesium chloride, and the mineral distribution within the sand specimens was examined. The effects of the precipitated minerals on the mechanical and hydraulic properties were evaluated by unconfined compressive strength (UCS) and permeability tests, respectively. The addition of magnesium was found to be effective in delaying the reaction rate by more than one hour. The uniform distribution of the precipitated minerals within a 1-m sand column was obtained when 0.1 mol/L and 0.4 mol/L of magnesium and calcium, respectively, were injected. The strength increased gradually as the mineral content was further increased. The permeability test results showed that the hydraulic conductivity was approximately constant in the presence of a 6% mineral mass. Thus, it was revealed that it is possible to control the strength of treated sand by adjusting the amount of precipitated minerals.

키워드

과제정보

연구 과제 주관 기관 : Penta-Ocean Construction Co., Ltd.

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  2. Factors affecting the urease activity of native ureolytic bacteria isolated from coastal areas vol.17, pp.5, 2017, https://doi.org/10.12989/gae.2019.17.5.421
  3. Debonding of microbially induced carbonate precipitation-stabilized sand by shearing and erosion vol.17, pp.5, 2019, https://doi.org/10.12989/gae.2019.17.5.429
  4. Review of Enzyme-Induced Calcite Precipitation as a Ground-Improvement Technique vol.5, pp.8, 2017, https://doi.org/10.3390/infrastructures5080066
  5. A Review of Enzyme Induced Carbonate Precipitation (EICP): The Role of Enzyme Kinetics vol.2, pp.1, 2017, https://doi.org/10.3390/suschem2010007
  6. Desiccation Induced Shrinkage of Compacted Lateritic Soil Treated via Enzymatic Induced Calcium Carbonate Precipitation Technique vol.1030, pp.None, 2021, https://doi.org/10.4028/www.scientific.net/msf.1030.110
  7. Improvement of Organic Soil Shear Strength through Calcite Precipitation Method Using Soybeans as Bio-Catalyst vol.11, pp.9, 2017, https://doi.org/10.3390/cryst11091044