An Experimental Comparison of the Fluidity of G-class cement with Portland cement

지열발전을 위한 지열정 시멘트용 G-class시멘트와 일반 포틀랜드시멘트와의 유동성 비교실험

  • Jeon, Jong-Ug (INNOGEO Technologies, System Development Division) ;
  • Won, Jong-Muk (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Choi, Hang-Seok (School of Civil, Environmental and Architectural Engineering, Korea University)
  • 전종욱 (이노지오테크놀로지 시스템개발부) ;
  • 원종묵 (고려대학교 건축사회환경시스템공학과) ;
  • 최항석 (고려대학교 건축사회환경시스템공학과)
  • Received : 2012.04.06
  • Accepted : 2012.05.11
  • Published : 2012.06.01


The G-class cement is usually used for geothermal well grouting to protect a steel casing which is equipped in a geothermal well to transfer geothermal water from deep subsurface to ground surface. In geothermal grouting process, obtaining appropriate fluidity is extremely important in order to fill cement grout flawlessly. In this paper, a series of the V-funnel and Slump Flow test was performed on both of the Portland cement and the G-class cement in order to compare fluidity and filling ability of those kind of cements. In the result of V-funnel test, the fluidity of G-class cement was evaluated much better than the Portland cement at the water/cement ratio of 0.8. In the case of Slump Flow test, the fluidity of G- class cement was estimated slightly better than the Portland cement at both the water/cement ratio of 0.55 and 0.8. Even though the initial fluidity and filling ability of G-class cement were relatively higher than the Portland cement, the results could be considerably changed with time. The results show that the fluidity and filling ability for geothermal well cementation can be properly controlled with water content and additives for adverse geothermal well environment.



Supported by : 한국에너지기술평가원(KETEP)


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