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Title |
Effects on the Mechanical Properties and Electrical Conductivity of Cement Mortar Containing Carbon and Steel Fibers
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Authors |
허광희(Gwang-Hee Heo) ; 박종건(Jong-Gun Park) ; 서동주(Dong-Ju Seo) ; 고성곤(Sung-Gun Koh) |
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DOI |
https://doi.org/10.4334/JKCI.2022.34.2.191 |
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Keywords |
탄소섬유; 강섬유; 섬유보강 시멘트 모르타르(FRCM); 전기 전도도; 퍼콜레이션 임계점 carbon fiber; steel fiber; fiber-reinforced cement mortar (FRCM); electrical conductivity; percolation threshold |
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Abstract |
This paper experimentally evaluated the effects on the mechanical properties and electrical conductivity of cement mortar containing carbon and steel fibers, which are conductive materials. Performance of conductive fiber-reinforced cement mortar (FRCM) was studied based on compressive strength test, flexural strength test and electrical conductivity test. Performances were compared and reviewed with plain mortar (PM) at age of 28 days. Furthermore, the surface shape of the developed conductive FRCM fracture surface was investigated using a scanning electron microscope (SEM). Flexural strengths of conductive carbon fiber reinforced cement mortar (CFRCM) and steel fiber reinforced cement mortar (SFRCM) were significantly improved compared to that of plain mortar; the increase in steel fiber content enhanced the post-peak flexural toughness, especially for SFRCM specimens containing 1.0 % to 1.25 % fiber by volume. However, the compressive strength of conductive CFRCM decreased significantly as the fiber volume fraction increased, and the tendency of strength decrease was greater in CFRCM containing 1.25 % fiber by volume. Overall, adding steel fibers up to 1.25 % led to no significant improvement of electrical conductivity of SFRCM. In contrast, electrical conductivity of all CFRCMs except for those with low fiber volume fractions of carbon fibers (i.e., 0.1~0.3 %) significantly increased. The percolation threshold detected for CFRCM used this study showed that a carbon fiber dosage of 0.4 % led to optimum electrical conductivity.
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