Geophysics and Geophysical Exploration (지구물리와물리탐사)

Korean Society of Earth and Exploration Geophysicists (한국지구물리·물리탐사학회)
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Mortar Characterization using Electrical Resistivity Method

모르타르의 전기비저항 특성

  • Farooq, Muhammad (Department of Mineral Resources and Energy Engineering, Chonbuk National University) ;
  • Park, Sam-Gyu (Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources (KIGAM)) ;
  • Song, Young-Soo (Department of Mineral Resources and Energy Engineering, Chonbuk National University) ;
  • Kim, Jung-Ho (Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources (KIGAM))
  • ;
  • 박삼규 (광물자원연구본부, 한국지질자원연구원) ;
  • 송영수 (자원에너지공학과, 전북대학교) ;
  • 김정호 (광물자원연구본부, 한국지질자원연구원)
  • Published : 2009.05.28
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Abstract

Cement based mortars are widely used to improve the soft ground of a dam site, highway construction, and karst voids. The mechanical properties of the mortar are well documented in literature, however very limited work is done on their physical properties such as electrical resistivity which is considered as one of the most important physical property known while improving the soft grounds. In this paper, electrical resistivity of the Portland cement mortars is examined by employing the Wenner technique. Cylindrical specimens with various water/cement ratios (w/c) ranges from 0.35, 0.45, 0.50 and 0.65 were cast and tested. The test results showed that the electrical resistivity of the mortar increases with increasing curing time and decreases with increasing water content and w/c. A reasonable, good relation was found between electrical resistivity and compressive strength of mortar.

시멘트 모르타르는 고속도로 건설 및 댐 사이트의 연약지반 보강과 석회암 공동의 지반보강에 널리 사용되고 있다. 모르타르의 물리적 성질은 많은 연구 결과로부터 잘 알려져 있지만, 연약지반의 개량 정도를 평가하기 위해서 알아야 할 가장 중요한 물성 중의 하나인 전기비저항에 대해서는 극히 일부의 연구만 수행되어 있다. 이 연구에서는 물과 포틀랜드 시멘트의 배합비(0.35, 0.45, 0.50, 0.65)를 달리하여 원통형의 모르타르 시료를 제작하여, 웨너 배열 방식으로 전기비저항을 측정하였다. 그 결과 모르타르 시료의 전기비저항은 경과시간에 따라 증가하였으며, 함수비와 물/시멘트의 배합비가 증가할수록 감소하였다. 이 결과로부터 모르타르의 전기비저항과 압축강도는 밀접한 관계를 가지고 있음을 알 수 있었다.

Keywords

References

  1. Archie, G. E., 1942, The electrical resistivity log as an aid in determining some reservoir characteristics, Transitions of the AIMME, 146, 54-62
  2. Browne, R. D., 1982, Design prediction of the life for rein-forced concrete in marine and other chloride environments, Durability of Building Materials, 1(2), 113-125
  3. Christensen, B. J., Coverdale, R. T., Olson, R. A., Ford, S. J., Garboczi, E. J., Jennings, H. M., and Mason, T. O., 2005, Impedance spectroscopy of hydrating cement-based materials: measurement, interpretation, and application, Journal of the American Ceramic Society, 77(11), 2789-2804 https://doi.org/10.1111/j.1151-2916.1994.tb04507.x
  4. Elsener, B., 1988, Electrochemical methods for evaluating reinforced concrete structures, SIA Documentation D020, Non-destructive test of reinforced concrete structures, Swiss Association for Engineers and Architects, Ziirich, 27-37
  5. Fazeli, M. A., 2007, Construction of grout curtain in Karstic environment case study: Salam Farsi Dam, Environmental Geology, 51(5), 791-796
  6. Fu, X. and Chung, D. D. L., 1998, Sensitivity of the bond strength to the structure of the interface between rein-forcement and cement, and the variability of this structure, Cement and Concrete Research, 28(6), 787-793
  7. Gowers, K. R. and Millard, S. G., 1999, Measurement of concrete resistivity for assessment of corrosion severity of steel using Wenner technique, ACI Materials Journal, 96(5), 536-541
  8. Horpibulsuk, S., Miura N., and Nagaraj, T. S., 2003, Assess-ment of strength development in cement admixed high water content clays with Abram's law as a basis, Geotechnique. 53(4), 439-444
  9. McCarter, W. J., 1996, Assessing the protective qualities of treated and untreated concrete surfaces under cyclic wetting and drying, Building and Environment, 31(6), 551-556
  10. Michaux, M., Fletcher, P., and Vidick, B., 1989, Evolution at early hydration times of the chemical composition of liquid phase of oil- well cement pastes with and without additives part I: Additive free cement pastes, Cement and Concrete Research, 19(3), 443-456
  11. Michaux, M., Nelson, E. B., and Vidick, B., 1990, Chemistry and Characterization of Portland Cement, Well Cementing, E.B. Nelson (ed.), Elsevier Science Publishers, Amsterdam Chap. 2
  12. Millard, S. G., 1991, Reinforced concrete resistivity measure-ment techniques, Proc. Institution Civil Engineers, part 2, 71-88
  13. Perez-Pena, M., Roy, D. M., and Tamas, F. D., 1989, Influence of chemical composition and inorganic admixtures on the electrical conductivity of hydrating cement pastes, Journal of Materials Research, 4(1), 215-223
  14. Prentice, G., 1991, Electrochemical Engineering Principles, Prentice-Hall, Englewood Cliffs, New Jersey
  15. Wenner, F., 1916, A method of measuring earth resistivity U.S. Bureau of standard Bulletin, 12, 469-478