Journal of the Korean Recycled Construction Resources Institute (한국건설순환자원학회논문집)

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

DOI QR Code

Relationship Analysis between Half Cell Potential and Open Circuit Potential Considering Temperature Condition

온도 영향을 고려한 RC 구조의 반 전위 및 OCP의 상관성 분석

  • Yoon, Yong-Sik (Department of Civil and Environmental Engineering, Hannam University) ;
  • Kwon, Seung-Jun (Department of Civil and Environmental Engineering, Hannam University)
  • 윤용식 (한남대학교 토목환경공학과) ;
  • 권성준 (한남대학교 토목환경공학과)
  • Received : 2022.03.07
  • Accepted : 2022.03.17
  • Published : 2022.03.30
Download PDF
⟨ Previous Next ⟩

Abstract

The corrosion potential in concrete varies greatly with exposure and concrete mix conditions. In this study, RC (Reinforcement Concrete) samples were prepared considering cover depth, chloride concentration, and W/C(water to cement) ratio as variables, and HCP(Half Cell Potential) was measured, which evaluated comparative potential between embedded steel and concrete surface. In addition, OCP(Open Circuit Potential) was measured using buried steel and CE(Counter Electrode). Agar and NaOH solution were used as ion exchange materials and Hg/HgO was used for RE(Reference Electrode), which was more sensitive to temperature than HCP. Among the influencing factors, the exposure period and chloride concentration had a relatively greater effect than cover depth and w/c ratio. Additionally, the entire measured HCP and OCP showed a clearly linear relationship with increasing cover depth and w/c ratio. Through multiple regression analysis, the relationship between HCP and OCP was quantified, and an improved correlation was obtained with temperature effect.

콘크리트 내의 부식전위는 노출환경 및 배합에 따라 크게 변화한다. 본 연구에서는 피복 두께, 염화물 농도, 물-시멘트 비를 변수로 하여 RC 시편을 제조하였으며, 철근과 표면과의 전위차를 평가하는 HCP 측정을 수행하였다. 또한 매립된 철근과 상대전극을 이용하여 OCP의 측정하였다. 한천과 NaOH 수용액을 이온교환물질로, Hg/HgO를 기준전극으로 사용하여 OCP를 측정하였는데, HCP에 비하여 온도에 더욱 민감하게 작용하였다. 영향 인자 중 존치 기간 및 염화물 농도는 피복 두께 및 물-시멘트 비보다 상대적으로 큰 영향을 가지고 있었다. 또한 전체 측정된 HCP 및 OCP는 피복 두께 및 물-시멘트와 뚜렷한 선형관계를 나타내었다. 다중회귀분석을 통하여 HCP와 OCP의 관계를 정량화하였으며 온도를 고려하여 개선된 상관성을 도출하였다.

Keywords

Acknowledgement

본 연구는 정부의 지원으로 한국연구재단 중견연구자지원사업의 지원을 받아 수행되었으며 이에 감사드립니다(NRF-2020R1A2C2009462).

References

  1. Alonso, C., Andrade, C., Gonzalez, J.A. (1988). Relation between resistivity and corrosion rate of reinforcements in carbonated mortar made with several cement types, Cement and Concrete Research, 18(5), 687-698. https://doi.org/10.1016/0008-8846(88)90091-9
  2. Adams, R.D., Cawley, P. (1989). Defect types and non destructive testing techniques for composites and bonded joints, Construction and Building Materials, 3(4), 170-183. https://doi.org/10.1016/0950-0618(89)90011-1
  3. Andrade, C., Alonso, C. (1996). Corrosion rate monitoring in the laboratory and on-site, Construction and Building Materials, 10(5), 315-328. https://doi.org/10.1016/0950-0618(95)00044-5
  4. Broomfield, J.P. (1997). Corrosion of Steel in Concrete: Understanding, Investigation and Repair, E&FN, London, 1-15.
  5. Baek, S.H., Xue, W., Feng, M.Q., Kwon, S.J. (2012). Nondestructive corrosion detection in RC through integrated heat induction and IR thermography, Journal of Non Destructive Evaluation, 31(2), 181-190.
  6. Chung, L., Kim, J.H.J., Yi, S.T. (2008). Bond strength prediction for reinforced concrete members with highly corroded reinforcing bars, Cement and Concrete Composites, 30(7), 603-611. https://doi.org/10.1016/j.cemconcomp.2008.03.006
  7. Dhir, R.K., Jones, M.R., Elghaly, A.E. (1993). PFA concrete: exposure temperature effects on chloride diffusion, Cement and Concrete Research, 23(5), 1105-1114. https://doi.org/10.1016/0008-8846(93)90170-E
  8. Duffo, G.S., Farina, S.B., Giordano, C.M. (2009). Characterization of solid embeddable reference electrodes for corrosion monitoring in reinforced concrete structures, Electrochimica Acta, 54(3), 1010-1020. https://doi.org/10.1016/j.electacta.2008.08.025
  9. Li, F., Yuan, Y., Li, C.Q. (2011). Corrosion propagation of prestressing steel strands in concrete subject to chloride attack, Construction and Building Materials, 25(10), 3878-3885. https://doi.org/10.1016/j.conbuildmat.2011.04.011
  10. Ishida, T., Iqbal, P.O., Anh, H.T.L. (2009). Modeling of chloride diffusivity coupled with non-linear binding capacity in sound and cracked concrete, Cement and Concrete Research, 39(10), 913-923. https://doi.org/10.1016/j.cemconres.2009.07.014
  11. Kwon, S.J., Na, U.J., Park, S.S., Jung, S.H. (2009). Service life prediction of concrete wharves with early-aged crack: probabilistic approach for chloride diffusion, Structural Safety, 31(1), 75-83. https://doi.org/10.1016/j.strusafe.2008.03.004
  12. Kim, Y.Y., Kim, J.M., Bang, J.W., Kwon, S.J. (2014). Effect of cover depth, w/c ratio, and crack width on half cell potential in cracked concrete exposed to salt sprayed condition, Construction and Building Materials, 54(15), 636-645. https://doi.org/10.1016/j.conbuildmat.2014.01.009
  13. Karthick, S.P., Muralidharan, S., Saraswathy, V., Thangavel, K. (2014). Long-term relative performance of embedded sensor and surface mounted electrode for corrosion monitoring of steel in concrete structures, Sensor and Actuators B: Chemical, 192, 303-309. https://doi.org/10.1016/j.snb.2013.10.123
  14. Karthick, S.P,, Kwon, S.J., Lee, H.S., Muralidharan, S., Saraswathy, V., Natarajan, R. (2017). Fabrication and evaluation of a highly durable and reliable chloride monitoring sensor for civil infrastructure, RSC advances, 7(50), 31252-31263. https://doi.org/10.1039/c7ra05532c
  15. KIBSE. (2020). Investigation and Monitoring Academic Service for Inner Ring Road PSC Box Girder Bridge Tendon - Final Report, Korean Institute of Bridge and Structural Engineers, Seoul [in Korean].
  16. Lee, S.K., Zielske, J. (2014). An FHWA special study: post-tensioning tendon grout chloride thresholds, Federal Highway Administration, FHWA-HRT-14-039.
  17. Lee, S.S., Kwon, S.J. (2021). Characteristics of OCP of reinforced concrete using socket-type electrodes during periodic salt damage test, Journal of the Korea Institute for Structural Maintenance and Inspection, 25(4), 28-36 [in Korean]. https://doi.org/10.11112/JKSMI.2021.25.4.28
  18. Maierhofer, C., Arndt, R., Rollig, M., Rieck, C., Walther, A., Scheel, H., Hillemeier, B. (2006). Application of impulse-thermography for nondestructive assessment of concrete structures, Cement and Concrete Composites, 28(4), 393-401. https://doi.org/10.1016/j.cemconcomp.2006.02.011
  19. Matsumura, T., Shirai, K., Saegusa, T. (2008). Verification method for durability of reinforced concrete structures subjected to salt attack under high temperature conditions, Nuclear Engineering and Design, 238(5), 1181-1188. https://doi.org/10.1016/j.nucengdes.2007.03.032
  20. Maekawa, K., Ishida, T., Kishi, T. (2009). Multi-Scale Modeling of Structural Performance, Taylor Fr, London, 322-325.
  21. Permeh, S., Lau, K., Lasa, I., Paredes, M. (2015). "Material and corrosion evaluation of defficient PT grout with enhanced sulfate concentrations," NACE Corrosion 2015, NACE CORROSION, Houston, TX, USA, 5828.
  22. Park, S.S., So, B.T. (2016). A study on correlation between accelerated corrosion test and long-term exposure test according to the temperature condition, Journal of Recycled Construction Resources, 4(2), 203-208 [in Korean].
  23. Song, H.W., Saraswathy, V. (2006). Studies on the corrosion resistance of reinforced steel in concrete with ground granulated blast-furnace slag-an overview, Journal of Hazardous Materials, 138(2), 226-233. https://doi.org/10.1016/j.jhazmat.2006.07.022
  24. Shao, X.M., Feldman, J.L. (2007). Micro-agar salt bridge in patch-clamp electrode holder stabilizes electrode potentials, Journal of Neuroscience Methods, 159(1), 108-115. https://doi.org/10.1016/j.jneumeth.2006.07.001
  25. So, H.S., Choi, S.H., Seo, C.S., Seo, K.S., So, S.Y. (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
  26. Thomas, M.D., Bamforth, P.B. (1999). Modelling chloride diffusion in concrete: effect of fly ash and slag, Cement and Concrete Research, 29(4), 487-495. https://doi.org/10.1016/S0008-8846(98)00192-6
  27. Tsai, Y.H., Wang, J., Chien, W.T., Wei, C.Y., Wang, X., Hsieh, S.H. (2019). A BIM-based approach for predicting corrosion under insulation, Automation in Construction, 107, 102923. https://doi.org/10.1016/j.autcon.2019.102923
  28. Win, P.P., Watanabe, M., Machida, A. (2004). Penetration profile of chloride ion in cracked reinforced concrete, Cement and Concrete Research, 34(7), 1073-1079. https://doi.org/10.1016/j.cemconres.2003.11.020
  29. Yoon, Y.S., Ryu, H.S., Lim, H.S., Koh, K.T., Kim, J.S., Kwon, S.J. (2018). Effect of grout conditions and tendon location on corrosion pattern in PS tendon in grout, Construction and Building Materials, 186, 1005-1015. https://doi.org/10.1016/j.conbuildmat.2018.08.023
  30. Yang, K.H., Lim, H.S., Kwon, S.J., Kim, J.H. (2020). Repair cost estimation techniques for reinforced concrete structures located at the seashore: Considering various probabilistic service life functions and actual mix proportions, Construction and Building Materials, 256, 119469. https://doi.org/10.1016/j.conbuildmat.2020.119469