Journal of the Korean Recycled Construction Resources Institute (한국건설순환자원학회논문집)

Korean Recycled Construction Resources Institute (한국건설순환자원학회)
권호 표지
DOI QR코드

DOI QR Code

Heating Transferring Charcteristics of Cement Mortar Block with Waste CNT and Conduction Activator

폐CNT와 전도촉진재를 혼입한 시멘트 모르타르 블록의 발열 전도 특성

  • 구현철 ((주)하이퍼콘) ;
  • 김운학 (한경대학교 건설환경공학과) ;
  • 오홍섭 (경상국립대학교 건설시스템공학과)
  • Received : 2022.05.30
  • Accepted : 2022.06.28
  • Published : 2022.06.30
Download PDF
⟨ Previous Next ⟩

Abstract

High-purity waste CNTs were mixed into cement mortar to manufacture heat-generating concrete that can use low voltage power, and carbon fiber and waste cathode materials were also used improve the conductivity of the mortar. The waste CNTs were analyzed to have a high concentration of multi-walled CNTs, and substituted liquid type waste CNTs were used during mortar mixing in order to increase dispersibility. The temperature change of the mortar with CNT was evaluated when using electric power below DC 24 V in order to utilize a small self-generation facility such as small solar power module when the mortar heats up and to minimize electromagnetic waves. When liquid-type waste CNTs were applied and a voltage of DC 24 V was introduced, it rose to 60 ℃ in a 200 × 100 × 50 mm mortar block specimen. The field applicability of self heating mortar with waste CNT was sufficient and also the amount of change in heat energy in mortar with liquid type waste CNT, carbon fiber and waste cathode materials is more effective compared to it of other variables.

저전력 사용이 가능한 발열콘크리트를 제작하기 위하여 시멘트 모르타르에 고순도 폐CNT를 혼입하였으며, 모르타르의 전도율을 향상시키기 위하여 압축강도를 제어하는 수준에서 탄소섬유와 폐음극재를 활용하고자 하였다. 사용된 폐CNT는 다중벽 CNT의 함유량이 많은 것으로 분석되었고, 모르타르 배합시 분산성을 높이기 위하여 액상형으로 치환하여 사용하였다. 모르타르 발열시 태양광 등에 의한 소형 자가발전 설비를 활용하고 전자파를 최소화하기 위하여 DC 24 V이하의 전력 사용시의 모르타르의 온도 변화를 평가하였다. 액상형 폐CNT를 적용하고, DC 24 V의 전압을 도입한 경우 200 × 100 × 50 mm 블럭 시험편에서 60 ℃까지 상승하였으며, 액상형 폐CNT와 탄소섬유, 폐음극재를 모두 사용한 경우에는 DC 12 V에서도 55 ℃이상까지 온도가 상승하여 현장 적용성이 충분한 것으로 판단되었다. 특히 발열에너지 변화량에 있어서도 다른 변수들과 비교하여 효과적인 것으로 나타났다.

Keywords

Acknowledgement

이 논문은 국토교통과학기술진흥원 국토교통기술촉진연구사업(22CTAP-C164040-02)의 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, S.K. (2014). An Experiment Study on The Characteristics of X-Ray Shielding In Carbon Nano Tube Mixed Concrete, Master's Thesis, Hanyang University [in Korean].
  6. Koo, H., Kim, W.H., Oh, H. (2022). Fundamental study on the strength and heat transferring charcteristic of cement composite with waste CNT, Journal of the Korean Recycled Construction Resources Institute, 10(1), 66-73 [in Korean]. https://doi.org/10.14190/JRCR.2022.10.1.66
  7. Labulo, A.H., Martincigh, B.S., Omondi, B., Nyamori, V.O. (2017). Advances in carbon nanotubes as efficacious supports for palladium-catalysed carbon-carbon cross-coupling reactions, Journal of Materials Science, 52(16), 9225-9248. https://doi.org/10.1007/s10853-017-1128-0
  8. 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.
  9. 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
  10. 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.
  11. Oh, S., Oh, K.S., Jung, S.H., Chung, W., Yoo, S.W. (2017). Effects of CNT additions on mechanical properties and microstructures of cement, Journal of the Korea Institute for Structural Maintenance and Inspection, 21(6), 162-168 [in Korean]. https://doi.org/10.11112/JKSMI.2017.21.6.162
  12. 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 [in Korean]. https://doi.org/10.9798/kosham.2018.18.6.221
  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