Journal of the Korean Recycled Construction Resources Institute (한국건설순환자원학회논문집)

Korean Recycled Construction Resources Institute (한국건설순환자원학회)
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Improvement of Seawater Corrosion Resistance of Concrete Reinforcing Steel Using by Conductive Photocatalyst

전도성 광촉매를 이용한 콘크리트 철근의 염해 내구성 향상에 관한 연구

  • Bae, Geun-Guk (Haeundae-gu Office Economy Promotion Division) ;
  • Bae, Geun-Woo (MARINE General Construction) ;
  • Ahn, Yong-Sik (Deprt. of Materials Science & Engineering, Pukyong National University)
  • 배근국 (부산광역시 해운대구청 경제진흥과, 부경대학교 재료공학과) ;
  • 배근우 (마린종합건설(주)) ;
  • 안용식 (부경대학교 재료공학과)
  • Received : 2017.04.28
  • Accepted : 2017.06.13
  • Published : 2017.06.30
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Abstract

In marine environment, the durability of concrete and reinforcing steel is known to be deteriorate by the permeation of chloride ion into concrete. In this study the conductive photocatalyst was used to improve the seawater corrosion resistance of the concrete and steel. Mortar and concrete samples were prepared by mixing with various amounts of conductive active carbon and photocatalytic powder($TiO_2$). The compressive strength of concrete was decreased with the increase of the amount of conductive carbon powders. The samples containing conductive carbon and photocatalytic powders showed the superior seawater corrosion resistance compared with the ordinary sample, which was verified by XRF analysis showing the concentration of chloride ion($Cl^-$) of mortars and concretes. The inhibitive effect of photocatalyst against chloride attack was discussed with the diffusion coefficient of chloride ion into mortar and concrete.

해양환경에서 콘크리트의 내구성과 철근의 부식은 콘크리트 내부로 침투하는 염소이온에 의해 악화된다. 본 연구에서는 염소이온에 의해 야기되는 콘크리트의 염해부식에 대한 저항성을 향상시키기 위해 전도성 광촉매를 사용하였다. 시험체로는 전도성 활성탄소와 광촉매($TiO_2$)분말을 혼합하여 모르타르와 콘크리트를 제작하였다. 전도성 탄소의 함량이 증가할수록 압축강도는 감소하였다. 전도성 광촉매가 첨가된 시험체가 일반 시험체보다 월등히 우수한 내염해부식성을 나타내었으며 이것은 XRF 시험에 의한 분석 결과 모르타르 또는 콘크리트 내부로의 염소이온 확산이 광촉매 작용에 의해 억제되었기 때문인 것으로 판단되었다. 모르타르 및 콘크리트 내부로의 염소이온 확산계수를 구함으로써 광촉매에 의한 염소이온 확산에 대한 억제반응이 분석되었다.

Keywords

References

  1. Antoine, P., Didier, R., Jean, V. (2001). Influence of pH and chloride anion on the photocatalytic degradation of organic compounds, Journal of Applied Catalysis B, Environmental 35, 117-124. https://doi.org/10.1016/S0926-3373(01)00244-2
  2. Cheong, H.M., Ahn, T.S., Lee, K.M. (2004). Improved technologies of durability of concrete bridge for chloride attack, Journal of the Korea Concrete Institute, 16(2), 31-37 [In Korean].
  3. Cho, S.H., Han, N.H., Chung, L. (2002). A Study on nondestructive method to measure the corrosion level of reinforcing bar, Journal of the Architectural Institute of Korea, 18(8), 19-26 [In Korean].
  4. Hong, S.J., Lee, S.W. (2013). An experimental study for the construction of photocatalytic method concrete road structure, Journal of Highway Engineering, 15(6), 1-9 [In Korean].
  5. Kang, S.H. (1998). Electrically conductive concrete, Journal of the Korea Concrete Institute, 10(6), 34-40 [In Korean].
  6. Kang, T.G., Jang, Y.H., Park, K.C. (2009). Photoelectrical conductivity and photodegradation properties of $TiO_2$ and Ag sputtered $TiO_2$ plasma spraying coatings, Journal of Korea Electrotechnology Research Institute, 27(2), 156-161 [In Korean].
  7. Kim, K.H., Cha, S.W. (2009). Chloride diffusion coefficient model considering the initiation time of exposure to chloride environment, Journal of the Korea Concrete Institute, 21(3), 377-386 [In Korean]. https://doi.org/10.4334/JKCI.2009.21.3.377
  8. Lee, H.H., Kwon, S.J. (2013). Evaluation of chloride penetration in concrete with ground granulated blast furnace slag considering fineness and replacement ratio, Journal of Korean Recycled Construction Resources Institute, 1(1), 26-34 [In Korean]. https://doi.org/10.14190/JRCR.2013.1.1.026
  9. Michael, V., Allen, J. (1991). Direct determination of diffusion coefficients by chronoamperometry at microdisk electrodes, Journal of Electroanal. Chem., 308, 27-38. https://doi.org/10.1016/0022-0728(91)85056-U
  10. Oh, B.H., Jang, S.Y., Shin, Y.S. (1999). Corrosion characteristics of steel reinforcements induced by internal chlorides in concrete and determination of chloride thresholds, Journal of the Korea Concrete Institute, 11(3), 193-203 [In Korean] https://doi.org/10.22636/JKCI.1999.11.3.193
  11. So, H.S., Choi, S.H., Seo, C.S. (2014). Influence of temperature on chloride ion diffusion of concrete, Journal of the Korea Concrete Institute, 26(1), 71-78 [In Korean]. https://doi.org/10.4334/JKCI.2014.26.1.071
  12. So, H.S., Oh, J.S., Park, G.B. (2011). Permeability and Transport Mechanisms of Media into Concrete, Report No.37, Kistec, 53-77.
  13. Yi, S.Y., Lee, J.B. (2000). Application of electrochemical corrosion measurement techniques for rebars in concrete, Journal of Corros. Sci. Soc. of Korea, 29(6), 313-324 [In Korean].