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Research Article

Characteristic of Permeability with the Sand, Calcium Bentonite and Solidifier Mixtures according to Selective Reaction of TCE

트리클로로에틸렌(TCE) 선택적 반응에 따른 모래, 칼슘-벤토나이트 및 겔화제 혼합차수물의 투수 특성

Seong Yeol Yun1
,
Jeong Woo Choi2
,
Minah Oh3
,
Jai-Young Lee4
윤 성열1
,
최 정우2
,
오 민아3
,
이 재영4
1Member, Department of Environmental engineering, The University of Seoul, 163 Seoulsiripdae-ro, Dongdaemun-gu, Seoul, Republic of Korea
2Nonmember, Student, Department of Environmental engineering, The University of Seoul, 163 Seoulsiripdae-ro, Dongdaemun-gu, Seoul, Republic of Korea
3Member, Researcher, Department of Environmental engineering, The University of Seoul, 163 Seoulsiripdae-ro, Dongdaemun-gu, Seoul, Republic of Korea
Member, Professor, Department of Environmental engineering, The University of Seoul, 163 Seoulsiripdae-ro, Dongdaemun-gu, Seoul, Republic of Korea
* Corresponding Author
31 March 2020. pp. 25-33
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Abstract

본 연구에서는 기존 차수재가 수분과의 팽윤성을 갖는 특징을 개선하기 위해 모래, 칼슘-벤토나이트 및 겔화제 혼합물의 트리클로로에틸렌(TCE) 반응에 따른 투수 특성을 평가하였다. 이를 위해 연구 재료의 기본적인 특성 분석, 투수시험을 진행하였다. 투수계수는 칼슘-벤토나이트 혼합 비율이 증가함에 따라 감소하였으며, 겔화제 혼합 비율이 증가함에 따라 증가하였다. 결론적으로, 칼슘-벤토나이트 15%, 겔화제 30% 이상 혼합 시 지하수 유동에서의 투수계수는 α × 10-4 cm/sec 이상으로 분석되어 지하수 유동을 차단하지 않는 것으로 분석되었다. 또한 TCE 반응 시 혼합차수물의 투수계수는 α × 10-7 cm/sec 이하로 분석되어, 차단층 투수계수 조건(1.0 × 10-6 cm/sec 미만)을 만족하였다. 따라서 칼슘-벤토나이트와 겔화제는 TCE로 오염된 토양 및 지하수에 선택적 투수능 변환 특성을 보이는 차수재로서 활용이 가능하다.

To improvement the swelling characteristics of the existing cutoff wall against the moisture, the permeability of the sand, calcium bentonite and solidifier mixture according to the contact with trichloroethylene (TCE) was evaluated. Characteristics analysis and the permeability test of the research materials were performed. The permeability was decreased as the mixing ratio of the calcium bentonite was increased and it was increased as the mixing ratio of the solidifier was increased. In conclusion, when mixing 15% of calcium bentonite and more than 30% of solidifier, the permeability coefficient in the underground water movement was analyzed as more than α × 10-4 cm/sec showing that it does not block the underground water movement. In addition, as the permeability coefficient of mixtures after TCE reaction was analyzed as less than α × 10-7 cm/sec, it satisfied the condition of blocking layer (less than 1.0 × 10-6 cm/sec). Therefore, the calcium bentonite and solidifier can be utilized as barrier that showing the characteristic of percolation ability conversion in soil and underground water contaminated with TCE.

Keywords
Solidifier
Gelling agent
Calcium bentonite
Coefficient of permeability
Trichloroethylene

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Information
  • Publisher :Korean Geosythetics Society
  • Publisher(Ko) :한국지반신소재학회
  • Journal Title :Journal of the Korean Geosynthetics Society
  • Journal Title(Ko) :한국지반신소재학회 논문집
  • Volume : 19
  • No :1
  • Pages :25-33
  • Received Date : 2019-12-16
  • Revised Date : 2020-01-23
  • Accepted Date : 2020-02-18
  • DOI :https://doi.org/10.12814/jkgss.2020.19.1.025
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