Characteristics of Electrical Resistivity of Dry Sandstone with Respect to Temperature and Humidity

doi:10.12972/ksmer.2014.51.1.30

All Issue

2014 Vol.51, Issue 1 Preview Page Next Page

Research Paper

Characteristics of Electrical Resistivity of Dry Sandstone with Respect to Temperature and Humidity 온도와 습도에 따른 건조사암의 전기비저항 특성: 이태종·이상규
Tae Jong Lee and Sang Kyu Lee

28 February 2014. pp. 30-40

PDF

Abstract

A laboratory electrical resistivity measurement system in controlled temperature and humidity condition has been set up. Using the system, resistivity of a dry sandstone has been measured in various temperature and humidity conditions. Electrical resistivity showed very strong dependance on the temperature and humidity, maximum 232 times difference when relative humidity and temperature are in the ranges of 45∼85% and 20∼40℃, respectively. Electrical resistivity decreases when temperature and/or humidity increase. Ten percent change of relative humidity gives stronger effects to electrical resistivity than 5℃ of temperature change. It needs more than 7 days for the sample to reach equilibrium condition with the temperature and humidity inside the chamber, so that an asymptotic equation has been suggested to estimate the resistivity in equilibrium. The estimated resistivity showed clearer negative dependance on both temperature and humidity. Especially, it shows very clear negative linear dependancy between resistivity and relative humidity in log-linear scale.

Keywords

Controlled temperature and humidity

Dry sandstone

Resistivity

Temperature

Humidity

항온･항습 환경에서 건조한 암석 시료의 전기비저항을 측정할 수 있는 시스템을 구축하였다. 이를 이용하여 수포화 하지 않은 건조한 사암 시편을 이용해서 온도와 습도를 달리하며 전기비저항을 산출하고 온도 및 습도에 따른 건조사암의 전기비저항 특성을 고찰하였다. 상대습도가 45∼85% 범위, 온도가 20∼40℃ 범위에서 전기비저항을 10시간 측정할 때 측정되는 전기비저항은 온도와 습도에 크게 좌우되어 최대 232배의 차이를 보였다. 온도와 습도가 높아짐에 따라 전기비저항은 낮아지는 반비례관계를 보이며, 동일한 온도일 때에 습도가 10% 씩 변화하는 경우가 동일한 습도일 때에 온도가 5℃ 씩 변화하는 경우보다 더 강하게 영향을 받는다. 많은 경우에 시편 내부의 온･습도가 항온･항습기 내부의 설정 온･습도와 평형을 이루기 위해서는 7일 이상의 시간이 소요되어 적절한 점근식을 제안하였다. 이를 통해 추정한 평형상태의 전기비저항은 온도와 습도와 더욱 뚜렷한 반비례 관계를 보이며, 특히 습도와 전기비저항의 log값은 선형적 반비례 관계를 보인다.

키워드

항온･항습 환경

건조사암

전기비저항

온도

습도

References

Ahn, S.H., Amirikas, R., Bahk, S.Y., Gapienko, V.A., Hong, B., Hong, S.J., Jung, S.Y., Kim, J.Y., Kim, Y.J., Kim, Y.U., Koo, D.G., Lee, K.S., Lee, S.J., Lee, Y.L., Lim, I.T., Nam, S.K., Pac, M.Y., Park, S.K., Ra, Y.S., Rhee, J.T., Seo, S.W. and Sim, K.S., 2000, “Temperature and humidity dependence of bulk resistivity of bakelite for resistive plate chambers in CMS,” Nuclear Instruments and Methods in Physics Research A, Vol. 451, pp. 582-587.
ASTM, 2007, Standard test methods for DC resistance or conductance of insulating materials, D 257-07.
Kim, Y. and Choi, Y.K., 1999, “Experimental verification on factors affecting core resistivity measurements,” J. of the Korean Geophys. Soc., Vol. 2, No. 3, pp. 225-233.
Lee, S.K. and Lee, T.J., 2008, “Electrical resistivity versus water contents of core samples from a geothermal borehole in Pohang, Korea,” J. of the Korean Society of Mineral and Energy Resources Engineers, Vol. 45, No. 5, pp. 526-535.
Lee, S.K. and Lee, T.J., 2009, “Characteristics of electrical resistivity of cylindrical cement core with respect to the conductivity and contents of pore water,” J. of the Korean Society of Mineral and Energy Resources Engineers, Vol. 46, No. 5, pp. 553-562.
Lee, S.K. and Lee, S.K., 2010, “The prototype study of resistivity and porosity measurement for the sample collected near marine hydrothermal deposit,” Jigu-Mulli- wa-Mulli-Tamsa, Vol. 13, No. 4, pp. 378-387.
Lee, S.K., Lee, T.J. and Kim, H.C., 2013, “Electrical resistivity measurements of ultra-high resistivity materials by voltmeter-ammeter method,” J. of the Korean Society of Mineral and Energy Resources Engineers, Vol. 50, No. 4, pp. 512-524.
Park, S., Cho, S.J., Lee, T.J., Lee, S.K. and Lee, S.K., 2007, “Domestic and overseas technical trends on electro-physical properties measurement,” J. of the Korean Society of Mineral and Energy Resources Engineers, Vol. 44, No. 6, pp. 593-599.
Park, S.G., 2004, “Physical property factors controlling the electrical resistivity of subsurface,” Mulli-Tamsa, Vol. 7, No. 2, pp. 130-135.
Park, M.K., 2005, “Laboratory study on the electrical resistivity characteristics with contents of clay minerals,” Mulli-Tamsa, Vol. 8, No. 3, pp. 218-223.
Rezlescu, N., Rezlescu, E., Doroftei, C. and Popa, P.D., 2005, “Study of some Mg-based ferrites as humidity sensors,” J. of Physics: Conference Series, Vol. 15, pp. 296-299.

Information

Publisher :The Korean Society of Mineral and Energy Resources Engineers
Publisher(Ko) :한국자원공학회
Journal Title :Journal of the Korean Society of Mineral and Energy Resources Engineers
Journal Title(Ko) :한국자원공학회지
Volume : 51
No :1
Pages :30-40
DOI :https://doi.org/10.12972/ksmer.2014.51.1.30

[1] Ahn, S.H., Amirikas, R., Bahk, S.Y., Gapienko, V.A., Hong, B., Hong, S.J., Jung, S.Y., Kim, J.Y., Kim, Y.J., Kim, Y.U., Koo, D.G., Lee, K.S., Lee, S.J., Lee, Y.L., Lim, I.T., Nam, S.K., Pac, M.Y., Park, S.K., Ra, Y.S., Rhee, J.T., Seo, S.W. and Sim, K.S., 2000, “Temperature and humidity dependence of bulk resistivity of bakelite for resistive plate chambers in CMS,” Nuclear Instruments and Methods in Physics Research A, Vol. 451, pp. 582-587.

[2] ASTM, 2007, Standard test methods for DC resistance or conductance of insulating materials, D 257-07.

[3] Kim, Y. and Choi, Y.K., 1999, “Experimental verification on factors affecting core resistivity measurements,” J. of the Korean Geophys. Soc., Vol. 2, No. 3, pp. 225-233.

[4] Lee, S.K. and Lee, T.J., 2008, “Electrical resistivity versus water contents of core samples from a geothermal borehole in Pohang, Korea,” J. of the Korean Society of Mineral and Energy Resources Engineers, Vol. 45, No. 5, pp. 526-535.

[5] Lee, S.K. and Lee, T.J., 2009, “Characteristics of electrical resistivity of cylindrical cement core with respect to the conductivity and contents of pore water,” J. of the Korean Society of Mineral and Energy Resources Engineers, Vol. 46, No. 5, pp. 553-562.

[6] Lee, S.K. and Lee, S.K., 2010, “The prototype study of resistivity and porosity measurement for the sample collected near marine hydrothermal deposit,” Jigu-Mulli- wa-Mulli-Tamsa, Vol. 13, No. 4, pp. 378-387.

[7] Lee, S.K., Lee, T.J. and Kim, H.C., 2013, “Electrical resistivity measurements of ultra-high resistivity materials by voltmeter-ammeter method,” J. of the Korean Society of Mineral and Energy Resources Engineers, Vol. 50, No. 4, pp. 512-524.

[8] Park, S., Cho, S.J., Lee, T.J., Lee, S.K. and Lee, S.K., 2007, “Domestic and overseas technical trends on electro-physical properties measurement,” J. of the Korean Society of Mineral and Energy Resources Engineers, Vol. 44, No. 6, pp. 593-599.

[9] Park, S.G., 2004, “Physical property factors controlling the electrical resistivity of subsurface,” Mulli-Tamsa, Vol. 7, No. 2, pp. 130-135.

[10] Park, M.K., 2005, “Laboratory study on the electrical resistivity characteristics with contents of clay minerals,” Mulli-Tamsa, Vol. 8, No. 3, pp. 218-223.

[11] Rezlescu, N., Rezlescu, E., Doroftei, C. and Popa, P.D., 2005, “Study of some Mg-based ferrites as humidity sensors,” J. of Physics: Conference Series, Vol. 15, pp. 296-299.

Journal of the Korean Society of Mineral and Energy Resources Engineers ISSN:2288-0291(Print) 2288-2790(Online) 한국자원공학회지

All Issue