| Title |
Electrical Resistivity, Heating Performance, and Microstructural Characteristics of Three-Phase Electrically Conductive Cement Mortars |
| Authors |
최범균(Choi, Beom Gyun);·박종건(Park, Jong Gun);·윤창호(Yun, Chang-ho);·허광희(Heo, Gwang Hee) |
| DOI |
https://doi.org/10.12652/Ksce.2026.46.1.0039 |
| Keywords |
삼상 복합; 전기 발열; 시멘트 모르타르; 전기 비저항; 발열; 미세구조 특성 Three-phase composite; Electrical self-heating; Cement mortar; Electrical resistivity; Joule heating; Microstructural characteristics |
| Abstract |
In this study, the properties of three-phase composite electrically heated cement mortars incorporating multi-walled carbon nanotubes(MWCNT), micro steel fibers (MSF), and carbon fibers (CF) were systematically investigated. Electrically heated cement mortars have attracted increasing attention as an alternative technology for snow melting and ice prevention during winter conditions, and this study focused on the combined effects of conductive materials with different length scales. In particular, the synergistic effects resulting from the interactions among MWCNT, MSF, and CF were analyzed with respect to the microstructural characteristics, heating performance, and electrical behavior of the conductive mortars. The experimental results demonstrated that the three-phase composite system incorporating MWCNT, MSF, and CF exhibited a pronounced synergistic effect compared to single-phase or binary composite specimens. As the applied voltage and the dosage of MWCNT increased, the heating performance was significantly enhanced, while the electrical resistivity showed a marked decreasing trend. These results indicate that the formation of continuous conductive
pathways plays a critical role in improving the self-heating performance of cement mortars. Scanning electron microscopy (SEM) observations revealed that MWCNTs were relatively uniformly dispersed within the cement matrix together with MSF and CF, forming conductive networks and acting as effective bridging elements between conductive fillers. However, localized agglomeration of MWCNTs was also observed, which resulted in non-uniform conductive pathways and consequently contributed to a reduction in heating performance. Overall, the findings of this study clarify the relationship between microstructure and heating behavior in
three-phase conductive cement mortars and provide fundamental insights for the design of electrically heated pavement materials for
snow-melting and deicing applications. |