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이강자(Lee, Kangja),위지혜(Wi, Jihea),안용훈(An, Yonghoon),최항석(Choi, Hangseok),손병후(Sohn, Byunghu) 한국구조물진단유지관리학회 2009 한국구조물진단학회 학술발표회논문집 Vol.2009 No.2
This paper presents results of laboratory experiments for estimating the thermal conductivity of backfill materials that were compacted by a variety of compaction energy levels. Silica sand and decomposed granite soil have been chosen as backfill materials in this study. The thermal conductivity of the soil samples increases with an increase in compaction energy and water content, which corresponds to the well-known relationship among thermal conductivity-dry density-water content.
이강자 ( Lee Kangja ),위지혜 ( Wi Jihea ),안용훈 ( An Yonghoon ),최항석 ( Choi Hangseok ),손병후 ( Sohn Byunghu ) 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.13 No.2
This paper presents results of laboratory experiments for estimating the thermal conductivity of backfill materials that were compacted by a variety of compaction energy levels. Silica sand and decomposed granite soil have been chosen as backfill materials in this study. The thermal conductivity of the soil samples increases with an increase in compaction energy and water content, which corresponds to the well-known relationship among thermal conductivity-dry density-water content.
지중 열교환기용 뒤채움재로서 흑연을 첨가한 벤토나이트 그라우트재의 열전도도 및 점도 특성
이철호(Chulho Lee),이강자(Kangja Lee),최항석(Hangseok Choi),최효범(Hyopum Choi) 한국지열·수열에너지학회 2009 한국지열에너지학회논문집 Vol.5 No.1
Bentonite-based grouting has been usually used for sealing a borehole installed for a dosed-loop vertical ground heat exchanger in a geothermal heat pump system (GHP) because of its high swelling potential and low hydraulic conductivity. The bentonite-based grout, however, has relatively lower thermal conductivity than that of ground formation. Accordingly, it is common to add some additives such as silica sand into the bentonite- based grout for enhancing heat transfer. In this study, graphite is adapted to substitute silica sand as an addictive because graphite has very high thermal conductivity. The effect of graphite on the thermal conductivity of bentonite-based grouts has been quantitatively evaluated for seven bentonite grouts from different product sources. In addition, the viscosity of graphite-added bentonite grout was measured to evaluate the field pumpability of the grout.