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Title |
Analysis of Microstructure, Electrical and Resistance Heating Properties of Cement Composites Incorporating Conductive Fibers
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Authors |
서동주(Dong-Ju Seo) ; 이유재(You-Jae Lee) ; 최범균(Beom-Gyun Choi) ; 박종건(Jong-Gun Park) ; 허광희(Gwang-Hee Heo) |
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DOI |
https://doi.org/10.4334/JKCI.2023.35.5.543 |
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Keywords |
전도성 섬유; 전기전도성 시멘트 복합체(ECCC); 미세구조; 전기저항; 저항 발열 conductive fibers; electrical conductive cement composites (ECCC); microstructure; electrical resistance; resistive heating |
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Abstract |
When an electrical potential (voltage) is applied to electrically conductive cement composites (ECCCs) using embedded electrodes for snow removal and deicing of winter pavements, heat is generated due to the inherent resistance to current flow. This generated heat can be effectively used to melt the snow/ice accumulation on the pavements. In this study, experimental investigations were conducted into the electrical and resistance heating properties of cement composites incorporating micro carbon and macro steel fibers. Furthermore, scanning electron microscopy and thermo-gravimetric analysis were performed to analyze their effects on the microstructure and hydration products of the hardened cement composites, respectively. The results showed that resistance heating properties improved with increasing applied voltage and micro carbon fiber content. The highest heating temperature, reaching 65.9 °C, was achieved in the ECCC-CF1.25 specimen, which incorporated 1.25 % micro carbon fibers with an applied voltage of 30 V. However, the addition of macro steel fibers up to 1.25 % did not significantly enhance resistance heating properties. Electrical resistance decreased notably as the micro carbon fiber content increased, while the incorporation of macro steel fibers did not form a conductive network and led to increased electrical resistance, thus not improving resistance heating properties. It was evident that the microstructure and hydration products of the hardened cement composites remained relatively unchanged after repetitive electrical heating, maintaining stable electrical conductivity in the ECCC.
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