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2015 Vol.14, Issue 2
Effect of Mixed Ratios of Ground Improvement Material using Microorganisms on the Strength of Sands

미생물을 활용한 지반개량제의 혼합비율에 따른 사질토의 강도개선 효과

Kyung-Ho Park1
,
Daehyeon Kim2*
박 경호1
,
김 대현2*
1Graduate Student, Department of Civil Engineering, Chosun Univ.
2Associate Professor, Department of Civil Engineering, Chosun Univ.
*교신저자. *Corresponding Author. 
30 June 2015. pp. 1-9
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Abstract

In this study, the objective of the study is to evaluate the effect of calcium carbonate powder, produced by the microbial reactions, on the strength of soft ground (sand). To analyze the cementation effects of calcium carbonate powder produced by microbial reactions on the strength of the sand, six different types of specimens (untreated, calcium carbonate, cement, carbonate + cement (1:9, 3:7, 5:5)) were made. The specimen were tested after curing (7 and 28 days). Uniaxial compressive strengths were measured on D 5 cm × H 10 cm specimens. Based on the test results, as both the weight ratio and the curing period increase, calcium carbonate, cement, and calcium carbonate + cement specimens showed an increase in the strength. In addition, compared with the strength of the specimen with cement, the strengths of the specimens with mixing ratios of 1:9, 3:7, and 5:5 (carbonate : cement) were found to be 93.5~95.8%, 825.%, 65.2~70.6%.

Keywords
Microbial reaction
Calcium carbonate powder
Soft ground
Uniaxial compressive strength

본 연구에서는 미생물 반응으로 생성된 탄산칼슘을 분말로 제작하여 연약지반(모래)의 강도 증진 효과를 확인하고자 하였다. 미생물반응으로 생성된 탄산칼슘의 고결화 효과를 분석하기 위해 6가지 case(무처리, 탄산칼슘, 시멘트, 탄산칼슘+시멘트(1:9, 3:7, 5:5))를 모래 중량비에 따라 고결제를 달리(4%, 8%)하여 양생후(7일, 28일) 실험을 하였다. 또한 현장여건과 비슷한 조건의 실험을 하기 위해서 중량비에 따라 세립분(0%, 5%, 15%)를 추가하여 D 5cm × H 10cm 공시체로 성형한 후 일축압축강도를 측정하였다. 그 결과, 중량비와 양생일이 증가할수록 탄산칼슘, 시멘트, 탄산칼슘+시멘트 모두 강도가 증가하는 경향을 확인하였다. 또한 시멘트 강도 대비 중량비 1:9, 3:7, 5:5의 탄산칼슘+시멘트 강도를 비교한 결과 각각 93.5~95.8%, 82.5%, 65.2~70.6%로 나타났다.

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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 : 14
  • No :2
  • Pages :1-9
  • Received Date : 2015-03-12
  • Revised Date : 2015-03-30
  • Accepted Date : 2015-03-31
  • DOI :https://doi.org/10.12814/jkgss.2015.14.2.001
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