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Title |
Study on Microstructure and Electrical Properties of Cement Mortar Containing Conductive Fibers
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Authors |
박종건(Jong-Gun Park) ; 서동주(Dong-Ju Seo) ; 임두열(Doo-Yeol Lim) ; 이유재(Yu-Jae Lee) ; 허광희(Gwang-Hee Heo) |
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DOI |
https://doi.org/10.11112/jksmi.2022.26.3.72 |
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Keywords |
탄소섬유; 강섬유; 비저항; 침투 임계점; SEM/EDS(주사전자현미경/에너지 분산형 X-ray 분광분석기) Carbon fiber; Steel fiber; Resistivity; Percolation threshold; SEM/EDS(scanning electron microscope/energy disperse X-ray spectrometer) |
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Abstract |
This paper studied the effect on the microstructure, electrical properties, and compressive strength of cement mortar containing carbon fiber (CF) and steel fiber (SF), which are conductive materials. The resistivity of conductive fiber-reinforced cement mortar (FRCM) was measured using the 4-probe method, and the compressive strength was measured based on the compression test. Their performance was compared and reviewed with plain mortar (PM). Furthermore, the surface shape and composition of the fracture surface of the conductive FRCM were analyzed using a scanning electron microscope (SEM) and an energy disperse X-ray spectrometer (EDS). The results showed that the resistivity gradually increased as the curing time increased in all specimens, whereas the resistivity decreased significantly as the fiber volume fraction increased. Adding steel fibers up to 1.25% did not affect the resistivity of cement mortar considerably. On the contrast, the resistivity of carbon fiber was somewhat decreased even at low contents (ie, 0.1 to 0.3%), and thereafter, it was significantly decreased. The percolation threshold of the conductive CFRCM containing CF used in this experiment was 0.4%, and it is judged to be the optimum carbon fiber dosage to maximize the conductive effect while maintaining the compressive strength performance as much as possible. For the surface shape and composition analysis of conductive FRCM, the fracture surface was observed through SEM-EDS. These results are considered to be very useful in establishing the microstructure mechanism of reinforcing fibers in cement mortars.
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