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Title |
Analysis of Heat-generating Performance, Flexural Strength and Microstructure of Conductive Mortar Mixed with Micro Steel Fiber and MWCNT
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Authors |
최범균(Beom-gyun Choi) ; 허광희(Gwang-hee Heo) |
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DOI |
https://doi.org/10.11112/jksmi.2024.28.3.47 |
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Keywords |
마이크로 강섬유; 다중벽 탄소나노튜브 (MWCNT); 전도성 모르타르; 발열성능; 휨강도 Micro steel fiber; Multi-walled carbon nanotube (MWCNT); Conductive mortar; Heat-generating performance; Flexural strength |
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Abstract |
This study were conduced experimentally to analyze the heat-generating performance, flexural strength, and microstructure of conductive mortar mixed with micro steel fiber and multi-wall carbon nanotube (MWCNT). In the conductive mortar heat-generating performance and flexural strength tests, the mixing concentration of MWCNT was selected as 0.0wt%, 0.5wt%, and 1.0wt% relative to the weight of cement, and micro steel fibers were mixed at 2.0vol% relative to the volume. The performance experiments were conducted with various applied voltages (DC 10V, 30V, 60V) and different electrode spacings (40 mm, 120 mm) as parameters, and the flexural strength was measured at the curing age of 28 days and compared and analyzed with the normal mortar. Furthermore, the surface shape and microstructure of conductive mortar were analyzed using a field emission scanning electron microscope (FE-SEM). The results showed that the heat-generating performance improved as the mixing concentration of MWCNT and the applied voltage increased, and it further improved as the electrode spacing became narrower. However, even if the mixing concentration of MWCNT was added up to 1.0 wt%, the heat-generating performance was not significantly improved. As a result of the flexural strength test, the average flexural strength of all specimens except the PM specimen and the MWCNT mixed specimens was 4.5 MPa or more, showing high flexural strength due to the incorporation of micro steel fibers. Through FE-SEM image analysis, Through FE-SEM image analysis, it was confirmed that a conductive network was formed between micro steel fibers and MWCNT particles in the cement matrix.
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