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Engineering Properties of Controlled Low Strength Material for Sewer Pipe by Standard Soil Classification

표준토 조건별 하수관용 유동화 채움재의 공학적 특성

  • Lee, Jun (Daejeon & Chungnam Branch, Korea Conformity Laboratories) ;
  • Kim, Young-Wook (Daejeon & Chungnam Branch, Korea Conformity Laboratories) ;
  • Lee, Bong-Chun (Built Environment Materials Center, Korea Conformity Laboratories) ;
  • Jung, Sang-Hwa (Construction Technology Research Center, Korea Conformity Laboratories)
  • 이준 (한국건설생활환경시험연구원 대전.충남지원) ;
  • 김영욱 (한국건설생활환경시험연구원 대전.충남지원) ;
  • 이봉춘 (한국건설생활환경시험연구원 건축환경기술센터) ;
  • 정상화 (한국건설생활환경시험연구원 건설기술연구센터)
  • Received : 2018.09.06
  • Accepted : 2018.09.17
  • Published : 2018.09.30

Abstract

Controlled low strength material(CLSM), known as flowable fill is used sewer. This paper evaluates flowability, segregation, early strength and excavatability of CLSM made using standard soils such as SM, ML, CL, CH. Also, various mix proportions of CLSM containing kaolinite, red soil, Joomun Jin standard soil were developed and the mixing ratio optimized. It was considered as the flowability and early strength were severly affected by W/B, S/B, and early strength and flowability depend on standard soils which means the satisfaction conditions of CLSM were variety of standard soil conditions. Finally, not only optimal mixing proportions were deducted according to standard soil condition but confirmed effectiveness of bleeding and excavatability.

본 연구에서는 공사 시 발생하는 현장 굴착토를 활용한 하수관용 유동화 뒤채움재의 실용화 기술개발의 일환으로서 현장 굴착토를 모사한 표준토 종류별에 따른 CLSM의 배합요인별 유동성, 재료분리 저항성, 조기강도 및 재굴착강도 등의 공학적 특성을 검토하였다. 연구결과 카올리나이트, 황토, 주문진사를 이용하여 국내 토질을 대표하는 SM, ML, CL, CH 등의 대표토질을 구현할 수 있는 재료간 혼합비율을 도출하였다. 또한 CLSM의 유동성 및 조기압축강도에 가장 큰 영향을 미치는 요인은 W/B 및 S/B인 것으로 분석되었으며, 표준토 종류별에 따라 소요 유동성 및 조기강도를 만족시키는 범위가 매우 상이한 것으로 나타났다. 또한 유동성 및 초기강도를 확보할 수 있는 W/B 및 S/B를 적용한 표준토 종류별 CLSM의 재료분리저항성 및 재굴착성 평가를 통해 도출된 배합비율에 대한 유효성을 확인할 수 있었으며, 이를 통해 표준토 종류별에 따른 CLSM의 적정 배합비율을 도출하였다.

Keywords

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