Journal of the Korea Institute of Building Construction (한국건축시공학회지)

The Korean Institute of Building Construction (한국건축시공학회)
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Predicting Carbonation Progress of Carbonation Repaired RC Structures Repair

탄산화가 진행된 기존 RC구조물의 보수 공법 적용 후 탄산화 진행 예측

  • Received : 2017.01.24
  • Accepted : 2017.05.19
  • Published : 2017.06.20
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Abstract

Carbonation of concrete is being occurred due to interaction of atmospheric carbon dioxide with hydroxides. Reinforce concrete (RC) structure is getting collapse or accident due to corrosion of embedded steel rebar. The maintenance of reinforced concrete structure recently has the attention of researchers regarding durability of structure and its importance day by day is increasing. In order to study the carbonation progress of pre-repaired concrete, present study was carried out to measure the carbonation velocity for different repair materials up to 100% of carbonation. The obtained results have predicted the carbonation progress of repair materials in service condition. These results have been verified by FEM and FDM analysis. As a result, the carbonation depth can be predicted by using the carbonation prediction formula after the repair, and the analytical and the experimental values are almost similar when the initial $Ca(OH)_2$ concentration is assumed to be 40%.

본 연구에서는 탄산화가 이미 진행된 콘크리트 구조물을 대상으로 촉진 탄산화 실험을 실시하였다. 각 보수재별 탄산화 속도계수를 도출 후 보수후의 탄산화 진행 예측식을 이용하여 탄산화 진행 예측한다. 또한 신뢰성 확보를 위하여 FDM과 FEM 해석을 통한 탄산화 깊이 예측을 비교했다. 그 결과 보수후 탄산화 예측식을 이용하면 탄산화 깊이를 예측할 수 있으며, 초기 $Ca(OH)_2$ 농도 40%로 가정할 때 해석 값과 실험값이 거의 유사함을 알 수 있었다.

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References

  1. Kim MH, Kwon YJ, Kang SP, Kim GY. A study on the investigation of carbonation velocity and remaining life by actual condition for reinforced concrete apartments in korea. Architectural Institute of Korea. 2001 Jan;17(1):45-50.
  2. Lee CS, Kim YG, Kim YH. A suggestion of carbonation-prediction equations of viaducts and structures covered creek for road vehicle in seoul metropolitan. Korea Concrete Institute. 2007 May;19(1):649-52.
  3. Kwon SJ, Song HW, Byun KJ. Durability design for cracked concrete structures exposed to carbonation using stochastic approach. Korean Society of Civil Engineers. 2005 Sep;25(5):741-50.
  4. Koh KT, Kim SW, Kim DG, Song MS, Cho YC. Prediction of carbonation process in concrete. Korea Concrete Institute. 1999 Nov;11(2):767-70.
  5. Park YG. Development of carbonation-prediction equation of concrete under domestic exposure environments[master's thesis]. [Seoul (Korea)]: Yonsei University; 2002. 95 p.
  6. Lee JG, Park KS, Kim HJ, Lee JJ. Prediction model of remaining service life of concrete for irrigation structures by measuring carbonation. Korea Concrete Institute. 2003 Jan;15(4):529-40. https://doi.org/10.4334/JKCI.2003.15.4.529
  7. Aguiar JB, Júnior C. Carbonation of surface protected concrete. construction and building materials. 2013 Dec;49:478-83. https://doi.org/10.1016/j.conbuildmat.2013.08.058
  8. Hamada M, Kishitani K, Yamane S. The influence of forms on the properties concrete : on absorption and carbonation of surface of concrete. Transactions of the Architectural Institute of Japan. 1962 Sep;(76):1-36.
  9. Kishitani K, Kobayashi K, Kashino N, Uno Y. The relationship between rebar corrosion and neutralization in the concrete containing chloride. Concrete Research and Technology. 1991 Jan;2(1):77-84. https://doi.org/10.3151/crt1990.2.1_77
  10. Masuda Y, Tanano H. Mathematical model on progress of carbonation of concrete. Concrete Research and Technology. 1991 Jan;2(1):125-34. https://doi.org/10.3151/crt1990.2.1_125
  11. Fukushima T. Tendency of the concentration of atmospheric carbon dioxide and new prediction/ evaluation methods of the progress of carbonation of concrete. Proceedings of the Symposium on Global Environment; 2001 Jun 26; Kitakyushu, Japan. Tokyo (Japan): Japan Society of Civil Engineers; 2001. p. 151-6.
  12. Yoda A, Yokomuro T. Strength and carbonation of high early-strength cement concrete in 32-year lapse after placement. Ashikaga Institute of Technology Research report. 2003 Dec;37:27-30.
  13. Baba A, Senbu O. A predictive method of carbonation depth of concrete with various. Proceedings of the Japan Concrete Institute; 1987 Sep 9; Tokyo, Japan. Tokyo(Japan): Japan Concrete Institute; 1987. p. 333-8.
  14. K. Shirayama, Structure of durability of present and future, Japan Concrete Institute 1988 Sep;26(11):4-10.
  15. Izumi I, Oshida F. Studies on concrete carbonation and reinforcement corrosion in reinforced concrete building. Journal Of Structural And Construction Engineering. 1989 Dec:(406):1-12.
  16. Architectural Institute of Japan. Recommendations for durability design and construction practice of reinforced concrete buildings. 2nd ed. Tokyo(Japan): Architectural Institute of Japan; 2016. 260 p.
  17. KS F 2596, Method for Measuring Carbonation Depth of Concrete. Korea Industrial Standards, Seoul(Korea): Korean Standards & Certification Information Center; 2004. 7 p.
  18. Lee SH, Park WJ, Lee HS, Kyung JW, Byun YM. A study of fem analysis to evaluate restrain- performance of surface-finishes for carbonation. Architectural Institute of Korea. 2007 Sep;23(9):151-8.
  19. Japan Concrete Institute. Life Time Evaluation Program for Concrete Structures by Computation Analysis; Version 2.0. 2nd ed. Tokyo(Japan): Japan Concrete Institute; 2010. 46 p.