Land and Housing Review (토지주택연구)

Land and Housing Research Institute (한국토지주택공사 토지주택연구원)
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Analysis of Viscosity and Bleeding Characteristics of Grouting Materials according to the Proportion of Bentonite

벤토나이트 함량에 따른 지반 그라우팅 재료의 점성 및 블리딩 특성 분석

  • 이종원 (부산대학교 사회환경시스템공학과) ;
  • 원조현 (부산대학교 사회환경시스템공학과) ;
  • 최현용 (부산대학교 사회환경시스템공학과) ;
  • 오태민 (부산대학교 사회환경시스템공학과)
  • Received : 2021.11.10
  • Accepted : 2021.12.04
  • Published : 2021.12.30
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Abstract

Grouting has been widely used to enhance the strength of the ground and prevent waterflow into the underground space in the geotechnical engineering field. Cement with bentonite can be considered a helpful grouting material because the bentonite has a swelling ability with water. Therefore, it is essential to evaluate the characteristics of grouting materials according to the mixing ratio for a successful grouting process. In this regard, the study investigated the viscosity and bleeding characteristics of grouting materials according to the mixing ratio (i.e., water/cement ratio and bentonite/cement ratio). In the experimental result, the viscosity increases with decreasing water/cement ratio and rising proportion of bentonite by weight of cement. However, the results of the bleeding ratio show the tendency is inversely proportional to the viscosity results. Bentonite was explored in terms of the viscosity and bleeding criterion. This result is expected to be meaningful to determine the optimized mixing ratio of bentonite-cement in the grouting field.

그라우팅 공법은 지반 내 토목구조물 활용 시 지반 강도특성을 증진시키거나 지하공간 활용 시 차수효과를 위하여 활발하게 적용되고 있다. 최근에는 그라우팅 기밀특성을 향상시키기 위하여 벤토나이트가 시멘트 재료와 함께 활용되고 있다. 이러한 벤토나이트-시멘트 그라우팅 재료의 원활한 주입을 위해서는 주입재료의 배합비율에 따른 특성을 사전에 파악하는 것이 중요하다. 본 연구에서는 그라우팅 재료로 주로 활용되고 있는 1종 보통 포틀랜드 시멘트와 벤토나이트를 이용하여 물/시멘트 배합비율 및 벤토나이트 함량에 따른 점성도 및 블리딩 발생비율을 분석하였다. 실험결과, 물/시멘트 배합비율이 감소하거나 벤토나이트 함량이 증가할수록 점성도는 급격히 증가하고 블리딩 비율은 감소하는 반비례 경향을 보였다. 또한, 적합한 재료 선정 기준에 따라 물/시멘트 배합비율 따른 적용가능한 벤토나이트 함량을 선정하였다. 본 연구에서 분석한 벤토나이트-시멘트 그라우팅 재료의 평가 결과는 향후 지반 내 적합한 그라우팅 재료 선정을 위하여 유용하게 활용될 수 있을 것으로 기대된다.

Keywords

Acknowledgement

이 논문은 한국연구재단 4단계 BK21 사업의 스마트 해양도시 인프라 교육연구단 과제를 통해 수행된 연구결과임(4199990614525).

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