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Evaluation of Soil Improvement by Carbonate Precipitation with Urease

요소분해효소에 의한 탄산칼슘 침전을 통한 지반 개량 평가

Jun Young Song1
,
Youngjong Sim2
,
Kyu-Nam Jin3
,
Tae Sup Yun4*
송 준영1
,
심 영종2
,
진 규남3
,
윤 태섭4*
1Graduate Student, Dept. of Civil and Environmental Engrg., Yonsei Univ
2Research Fellow, Land and Housing Institute
3Senior Research Fellow, Land and Housing Institute
4Associate Prof., Dept. of Civil and Environmental Engrg., Yonsei Univ.
1연세대학교 토목환경공학과 석사과정
2한국토지주택공사 토지주택연구원 건설기술연구실 수석연구원
3한국토지주택공사 토지주택연구원 건설기술연구실 실장
4연세대학교 토목환경공학과 부교수
*교신저자. *Corresponding Author. 
30 September 2017. pp. 61-69
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Abstract

This study presents the experimental results of CaCO3 formation in sand by the Enzyme Induced Carbonate Precipitation (EICP) method. Concentration of CaCO3 with elapsed reaction time is calibrated by standardized procedure by measuring CO2 pressure, and it increases with time towards asymptotic value. Jumunjin sand saturated with EICP solution shows that both shear wave velocity and electrical conductivity sharply increase as the reaction starts to approach to the constant values after 50 hours of reaction time. Urease concentration of 0.5 g/L exhibits 224% higher final shear wave velocity than that of 0.1 g/L. The nucleation models hint that carbonate tends to precipitate not only at grain contacts but also at grain surfaces. Regardless of urease concentration, electrical conductivity and shear wave velocity follow the unique path. The scanning electron microscopic images and X-ray computed tomographic images validate the spatial configuration of produced CaCO3 in soils.

Keywords
EICP
Urease
Cementation
Shear wave velocity
Electric conductivity
SEM
X-ray CT

본 연구에서는 사질토에서의 EICP에 의한 탄산칼슘 침전량을 정량적으로 평가하였다. 생성된 탄산칼슘은 염산과의 반응에 수반되는 이산화탄소 기체 압력 증분을 통해 간접적으로 측정하였으며, 이는 반응이 진행됨에 따라 특정 값으로 수렴하는 경향을 보였다. EICP 용액으로 포화된 주문진표준사의 전단파 속도 및 전기전도도값은 측정된 탄산칼슘량의 수렴시간보다 선행하여 일정한 값에 도달함을 확인하였다. 결정화 모델은 탄산칼슘이 흙 입자간 접촉점과 입자 표면에서 생성됨을 나타내며, 이를 통해 최종 전단파 속도 및 최종 전기전도도에 도달하는 시간과 탄산칼슘 생성량의 수렴시간 간의 불일치가 설명 가능함을 보였다. 또한, 용액 농도 0.5g/L를 이용한 최종 전단파 속도는 0.1g/L의 것보다 224% 높은 효율을 나타내었다. 더불어 효소의 농도와 무관하게 전기전도도와 전단파 속도의 상관관계가 있음을 확인하였으며 주사전자현미경과 X-ray CT 이미지 분석을 통해 생성된 탄산칼슘의 공간적 분포를 확인하였다.

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Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 33
  • No :9
  • Pages :61-69
  • Received Date : 2017-08-31
  • Accepted Date : 2017-09-15
  • DOI :https://doi.org/10.7843/kgs.2017.33.9.61
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