Proceedings of the Korean Geotechical Society Conference (한국지반공학회:학술대회논문집)

Korean Geotechnical Society (한국지반공학회)
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Study on cement-based grout for closed-loop vertical ground heat exchanger

수직 밀폐형 지중 열교환기 뒤채움재로서 시멘트 그라우트의 적용성 검토

  • Park, Moon-Seo (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Wi, Ji-Hae (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Lee, Chul-Ho (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Lee, Kang-Ja (Kolon Engineering and Construction Co., Ltd.) ;
  • Choi, Hang-Seok (School of Civil, Environmental and Architectural Engineering, Korea University)
  • 박문서 (고려대학교 건축사회환경공학부) ;
  • 위지혜 (고려대학교 건축사회환경공학부) ;
  • 이철호 (고려대학교 건축사회환경공학부) ;
  • 이강자 ((주)코오롱 건설) ;
  • 최항석 (고려대학교 건축사회환경공학부)
  • Published : 2010.03.25
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Abstract

In this paper, the applicability of cement grout has been studied as an alternative to bentontite grout to backfill ground heat exchangers. To provide an optimal mixture design, the groutabilty and thermal conductivity of cement grouts with various mixture ratios were experimentally evaluated and compared. The unconfined compression strength of cement grout specimen was measured, which are exposed to cyclic temperature variation ranging from $50^{\circ}C$ to $-5^{\circ}C$. In addition, the integrity of the interface between circulating HDPE pipes and cement grout by performing equivalent hydraulic conductivity tests, in which a pipe locates at the center of the specimen.

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