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Temperature and humidity dependency on electrical resistivity are discussed using sandstone (SS) and marble (MB) for porous samples and tempered glass (TG) for nonporous sample. A total of 54 experiments has been performed; 3 samples, 3 temperature conditions of 15, 25, and 35℃, 3 relative humidity conditions of 45, 65, and 85%, and 2 different initial conditions of dry and wet. Resistivity changes have been monitored for 10 hours by a voltmeter-ammeter method. Asymptote equation is successfully applied to the resistivity change for both dry and wet initial conditions simultaneously, which allow us to determine unique resistivity on a specific temperature and relative humidity. For TG sample, stronger resistivity changes can be observed by temperature change rather than relative humidity change, while vise versa for porous SS and MB samples, which means that even very small porosity of 0.42% and 0.74%, respectively, affects the resistivity with temperature and relative humidity changes.
공극의 유무에 따라 건조한 시편에서 전기비저항의 온도 및 습도의 영향을 고찰하였다. 공극이 있는 사암(SS) 및 대리암(MB)과 공극이 없는 강화유리(TG)의 3종의 시편에 대하여, 환경시험기의 설정 온도를 15, 25, 35℃, 습도를 45, 65, 85%, 그리고 시편의 초기조건을 건조상태와 습윤상태로 달리하여 총 54 경우에 대하여 전압송신-전류측정법에 의해 전기비저항을 모니터링하였다. 초기조건을 달리하여 10 시간 동안 측정한 두 전기비저항 그래프로부터 두 경우가 모두 같은 전기비저항으로 수렴한다는 조건으로 점근식을 적용하면 특정 온도와 습도에서의 전기비저항을 유일하게 제시할 수 있다. 또한, TG는 습도보다는 온도에 SS와 MB는 온도보다는 습도에 더 강하게 영향을 받는다. 즉, SS와 MB는 비록 0.42%와 0.74%로 공극률이 매우 작음에도 불구하고 공극의 존재에 의해 측정되는 전기비저항이 온･습도변화에 크게 영향을 받는다.
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- 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 :3
- Pages :427-436
- DOI :https://doi.org/10.12972/ksmer.2014.51.3.427
Journal of the Korean Society of Mineral and Energy Resources Engineers
