Journal of the Korean Geosynthetics Society (한국지반신소재학회논문집)

Korean Geosynthetics Society (한국지반신소재학회)
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The Study of Optimum Lime Content for Ground Improvement of Clayey Soils and Its Effects on Plasticity and Strength Characteristics

점성토 지반 개량을 위한 최적 생석회 첨가량 결정 및 이에 따른 소성 및 강도 특성 분석

  • Goo, Jeong-Min (Research Dept., Dong Myeong Engineering) ;
  • Choi, Changho (Dept. of Geotechnical Engineering, Korea Institute of Construction Technology)
  • Received : 2013.02.20
  • Accepted : 2013.03.13
  • Published : 2013.03.30
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Abstract

This study proposed optimum lime contents for clayey soils consisting of representative clay minerals, Kaolinite and Na-Bentonite, according to optimum lime content method (ASTM C 977-22) by means of ground improvement method of clayey soils. As geotechnical properties, the variations of atterberg limits and unconfined compressive strength were analyzed and Ca-ion and micro-structure along elapsed time were observed for lime-added clayey specimens. The test results show that optimum lime content method provides an appropriate methodology for ground improvement of clayey soils and the variation of $Ca^{2+}$ might be a good index to predict the rate of ground improvement for clayey soils with lime addition.

본 연구에서는 점성토 지반의 지반공학적 특성의 개량을 목적으로 ${\bigcirc}{\bigcirc}$지역에서 채집한 점성토와 이에 대한 대표적 점토광물인 Kaolinite 및 Na-Bentonite에 대하여 최적 생석회 첨가량 결정법(ASTM C 977-22) 방법에 의거하여 각 시료에 대하여 생석회 첨가량을 결정하였다. 이에 대한 지반공학적 특성인 아터버그한계, 일축압축강도의 변화에 대하여 분석하였으며, 시간경과에 따른 Ca 이온 변화 및 점토입자의 미세결정구조 변화를 관찰, 분석하였다. 본 실험 결과 점성토 지반의 지반공학적 특성 개선을 위하여 첨가되는 생석회 첨가량은 최적 생석회 첨가량 결정법에 의해 효과적으로 결정할 수 있고, 시간에 따른 $Ca^{2+}$ 이온 변화 측정치는 점성토 지반의 지반공학적 개선효과 추정에 활용 가능함을 확인하였다.

Keywords

References

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