Journal of the Korean Recycled Construction Resources Institute (한국건설순환자원학회논문집)

Korean Recycled Construction Resources Institute (한국건설순환자원학회)
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Fundamental Study on the Strength and Heat Transferring Charcteristic of Cement Composite with Waste CNT

폐CNT를 혼입한 시멘트 복합체의 강도 및 열전달 특성에 대한 기초적 연구

  • Koo, Hounchul (Nampyoung) ;
  • Kim, Woon-Hak (School of Civil & Environmental Engineering, Hankyong National University) ;
  • Oh, Hongseob (Department of Civil and Infrastructure Engineering, Gyeongsang National University)
  • 구현철 (남평산업) ;
  • 김운학 (한경대학교 건설환경공학과) ;
  • 오홍섭 (경상국립대학교 건설시스템공학과)
  • Received : 2022.02.23
  • Accepted : 2022.03.28
  • Published : 2022.03.30
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Abstract

The purpose of this study was to develop self-heating concrete by utilizing the conduction resistance of concrete in order to reduce the risk of occurrence of black ice in the concrete pavement in winter and to prevent damage caused by freez-thawing effect. For this purpose, it was attempted to evaluate the strength and temperature exothermic characteristics using powder and liquid waste CNTs and a waste cathode agent as a conduction promotion. It was analyzed that liquid waste CNT had an effective dispersion degree in the mortar and a small decrease in strength occurred. In addition, DC 24 V was supplied by applying steel mesh, copper foil and copper wire to the mortar as electrodes, and the temperature change characteristics according to the mixing ratio of spent CNTs, anodes and carbon fibers were evaluated. In addition, by evaluating the temperature characteristics according to the electrode spacing from the selected optimal mixture, it was confirmed that it had sufficient heating characteristics up to an electrode spacing of 100 mm up to AC 50 V.

동절기 콘크리트 포장체의 블랙아이스 발생위험을 낮추고 동결에 의한손상을 방지할 목적으로 콘크리트의 전도저항성을 활용하여 자기 히팅 콘크리트를 개발하고자 하였다. 이를 위하여 분말형과 액상형 폐CNT와 전도촉진을 위해 폐음극재를 사용하여 강도변화와 온도 발열특성을 평가하고자 하였다. 액상형 폐CNT가 모르타르내에서 분산정도가 효과적이고, 강도저하가 작게 발생하는 것으로 분석되었다. 또한 모르타르에 스틸매쉬, 구리포일과 구리선을 전극으로 적용하여 DC 24 V를 공급하였으며, 폐CNT, 폐음극재과 탄소섬유 혼입율에 따른 온도변화 특성을 평가하였다. 또한 선정된 최적배합으로부터 전극간격에 따른 온도 특성을 평가하여 AC 50 V 까지는 전극간격 100 mm 까지는 충분한 발열 특성을 갖는 것을 확인하였다.

Keywords

Acknowledgement

이 논문은 2021년도 경상국립대학교 대학회계 연구비 지원에 의하여 연구되었으며, 저자들은 이에 감사드립니다.

References

  1. Chang, C., Ho, M., Song, G., Mo, Y.L., Li, H. (2009). A feasibility study of self-heating concrete utilizing carbon nanofiber heating elements, Smart Materials and Structures, 18(12), 127001. https://doi.org/10.1088/0964-1726/18/12/127001
  2. Chu, H., Zhang, Z., Liu, Y., Leng, J. (2014). Self-heating fiber reinforced polymer composite using meso/macropore carbon nanotube paper and its application in deicing, Carbon, 66, 154-163. https://doi.org/10.1016/j.carbon.2013.08.053
  3. Gomis, J., Galao, O., Gomis, V., Zornoza, E., Garces, P. (2015). Self-heating and deicing conductive cement. Experimental study and modeling, Construction and Building Materials, 75, 442-449. https://doi.org/10.1016/j.conbuildmat.2014.11.042
  4. Karademir C.(2019). The electrical heating performance of multi-walled carbon nanotubes(MWCNT) reinforced mortar, Journal of Material Sciences & Engineering, 8(2), 1000519.
  5. Kim, H., Ban, H. (2017). An experimental approach to investigate the heat transferring effect of carbon nanotube on the concrete slab, Journal of the Korean GEO-environmental Society, 18(12), 59-63.
  6. Lee, H.Y., Kang, D.H., Song, Y.M., Chung, W.S. (2017). Heating experiment of CNT cementitious composites with single-walled and multiwalled carbon nanotubes, Journal of Nanomaterials, 2017, Article ID 3691509.
  7. Lee, H.Y., Song, Y.M., Loh, K.J., Chung, W.S. (2018). Thermal response characterization and comparison of carbon nanotube-enhanced cementitious composites, Composite Structures, 202, 1042-1050. https://doi.org/10.1016/j.compstruct.2018.05.027
  8. Liu, Y., Lai, Y., Ma, D.X. (2015). Research of carbon fibre grille reinforced composites in airport pavement snowmelt, Materials Research Innovations, 19(Sup10), 49-54.
  9. Oh, S., Oh, K., Jung, S., Chung, W., Yoo, S. (2017). Effects of CNT aditions on mechanical properties and microstructures of cement, Journal of the Korea Institute for Structural Maintenance and Inspection, 21(6), 162-168. https://doi.org/10.11112/JKSMI.2017.21.6.162
  10. Park, S., Lee, H., Chung, W. (2018). Experimental study on voltage supply efficiency of nano cement composite for prevention of road icing, Journal of the Korean Society of Hazard Mitigation, 18(6), 221-228. https://doi.org/10.9798/kosham.2018.18.6.221
  11. Song, D.G., Cho, H.K., Lee, H.S. (2016). Evaluation of the exothermic properties and reproducibility of concrete containing electro-conductive materials, Journal of the Korea Institute of Building Construction, 16(1), 25-34. https://doi.org/10.5345/JKIBC.2016.16.1.025
  12. Tuan, C.Y., Yehia, S. (2004). Evaluation of electrically conductive concrete containing carbon products for deicing, Materials Journal, 101(4), 287-293.
  13. Zhao, H., Wu, Z., Wang, S., Zheng, J., Che, G. (2011). Concrete pavement deicing with carbon fiber heating wires, Cold Regions Science and Technology, 65(3), 413-420. https://doi.org/10.1016/j.coldregions.2010.10.010