한국건설순환자원학회논문집 (Journal of the Korean Recycled Construction Resources Institute)

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

DOI QR Code

보수시기를 고려한 염해에 노출된 콘크리트 교각의 탄소량 평가

CO2 Evaluation of Reinforced Concrete Column Exposed to Chloride Attack Considering Repair Timing

  • 김성준 (한남대학교 건설시스템공학과) ;
  • 김영준 (한남대학교 건설시스템공학과) ;
  • 권성준 (한남대학교 건설시스템공학과)
  • 투고 : 2014.01.17
  • 심사 : 2014.02.26
  • 발행 : 2014.03.30
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

본 연구에서는 탄소배출 평가기법을 이용한 자재생산단계, 운송단계, 시공단계 뿐 아니라 보수시기 및 보수단위 탄소량을 고려하여 콘크리트 교각의 탄소배출량을 평가하였다. 혼화재료를 포함한 4가지 배합이 고려되었고 Life 365를 이용하여 염화물 침투를 평가하였으며, 이에 따른 보수횟수 및 보수시기를 설정하였다. 또한 목표내구수명동안 구조물의 피복두께를 걷어내어 재타설한 경우와 재타설 후 잔존염화물량을 제거하기 위한 전기화학적 공정의 사용유무에 따른 탄소배출량을 평가하였다. 평가결과 높은 물-결합재비를 가진 배합은 초기 시공단계에서의 탄소량은 상대적으로 적지만 보수횟수의 증가에 따라 탄소량이 증가하였으며, 탈염공법이 적용되는 경우 보수시의 단위 탄소량에 따라 전과정 탄소량이 크게 증가하였다. 보수횟수에 따라 탄소량의 증가가 발생하는데, W/B37-OPC의 경우 9번, W/B50-OPC에서는 18번, W/B40-SG에서는 4번, W/B74-SG는 7번으로 평가되었다. 더 긴 보수 불필요 기간을 가진 RC 구조물이 탄소량 감소에 유리함을 알 수 있다.

In this paper, $CO_2$ amount is evaluated considering repairing timing and unit $CO_2$ amount per repair method including various stage of material manufacturing, moving, and construction. Four mix proportions with mineral admixture are considered and repairing timing/numbers are simulated based on the results from Life 365 which can handle chloride penetration. Furthermore two repair methods (simple cover concrete replacement and replacement with electro-chemical method for removing chloride content) are considered and the related $CO_2$ emissions are evaluated. From the study, the case with high W/B (water to binder ratio) ratio shows smaller $CO_2$ emission in construction stage but it increases more rapidly with increasing number of repair. $CO_2$ emission considering electro-chemical method greatly increases with the increasing unit $CO_2$ for the repairing method. The numbers of jumping step (repairing number) are evaluated to be 9 for WB37-OPC, 18 for WB50-OPC, 4 for WB40-SG, and 7 for WB47-SG respectively. RC structures with the longer maintenance free period are evaluated to be advantageous for saving $CO_2$ emission.

키워드

참고문헌

  1. Back, J.H., Tae, S.H., Roh, S.J., Lee, J.H., and Shin, S.W. (2011), A study on the requisite elements of LCCO2 evaluation system at planning stage of building, Korean journal of construction engineering and management, 12(3), 31-41[in Korean]
  2. Broomfield, J.P. (1997). Corrosion of Steel in Concrete: Understanding, Investigation and Repair, London, E&FN, 1-15.
  3. Cheon, H-M., An, T-S., Kim, H-S., and Han, B-K. (2006). Current State and Prospect of Electrochemical Techniques for Protection of Steel Corrosion in Concrete, Journal of the Korea concrete institute, 18(5), 16-22
  4. ISO 14040. (2006). Environmental Management-Lifecycle Assessment-Principles and Framework. International Organization for Standardization, 2nd Ed., Switzerland.
  5. JSCE-Concrete committee. (2002), Standard specification for concrete structures.
  6. KCI-Korea Concrete Institute. (2010), Concrete & Environment, 242 [in Korean].
  7. KCI-Korea Concrete Institute. (2004), Concrete standard specification -. durability part [in Korean].
  8. Kim, J-Y., Kim S. W., and Son, J. Y. (2004a), A study on the estimation of the environmental Load Intensity of construction materials for the building LAC -Focused on the amount of energy consumption and $CO_2$ Emission by I/O table, Journal of the architectural institute of Korea: Planning & Design, 20(7), 208-215 [in Korean]
  9. Kim, J.Y., Lee, S.E., and Shon, J.Y. (2004b), "An Estimation of the Energy Consumption & $CO_2$ Emission Intensity during Building Construction," Journal of the architectural institute of Korea : Planning & design, 20(10), 319-326 [in Korean].
  10. Kim, J.W., Lee, K.S., and Shin, S.W. (2011), A study on the development of an assesment methodology for emission from concrete manufacturing to CIP, Journal of the architectural institute of Korea: Planning & Design, 27(8), 103-110 [in Korean].
  11. Kim, S.K., Lee, S.H., Na, Y-J., and Kim, J.T. (2013), "Conceptual model for LCC-based $LCCO_2$ analysis of apartment buildings," Energy and Buildings, 64(1), 285-291. https://doi.org/10.1016/j.enbuild.2013.05.016
  12. Kim, T.H., and Tae, S.H. (2010), A study on the development of an evaluation system of $CO_2$ emission in the production of concrete, Journal of the Korea concrete institute, 22(6), 787-796 [in Korean]. https://doi.org/10.4334/JKCI.2010.22.6.787
  13. Kwon, S.J., Song, H.W., Byun, K.J., and Park, C.K. (2007), Analysis of chloride penetration in concrete with mineral admixtures using neural network algorithm and micro modeling, Journal of the Korean Society of Civil Engineers, 27(1A), 117-129 [in Korean].
  14. Lee, H.K., Kim, H.K., and Hwang, E.A. (2010), Utilization of power plant bottom ash as aggregates in fiber-reinforced cellular concrete, Waste Management, 30(2), 274-284. https://doi.org/10.1016/j.wasman.2009.09.043
  15. Lee, H.S.(2006). Repair LCC evaluation of RC structures through the FEM analysis of chloride ion penetration, Journal of the Korea Institute for Structural Maintenance Inspection, 10(1) 223-230 [in Korean].
  16. Lee, K-H., and Lee, K-H. (1996), The estimation of amount of energy consumption and $CO_2$ emission in construction activities, Journal of the Architectural Institute of Korea, 12(7), 197-204 [in Korean]
  17. Lee, S.H., Park, W.J., and Lee, H.S. (2013). Lifecycle $CO_2$ assessment method for concrete using $CO_2$ balance and suggestion to decrease $LCCO_2$ of concrete in South-Korean apartment. Energy and Buildings, 58(1), 93-102. https://doi.org/10.1016/j.enbuild.2012.11.034
  18. Maekawa, K., Ishida, T., and Kishi, T. (2003), Multi-scale modeling of concrete performance, Journal of Advanced Concrete Technology, 1(2), 91-126. https://doi.org/10.3151/jact.1.91
  19. Pade, C., and Guimaraes, M. (2007), The $CO_2$ uptake of concrete in a 100 year perspective, Cement and Concrete Research, 37(9), 1348-1356. https://doi.org/10.1016/j.cemconres.2007.06.009
  20. Park, S.S., Kwon, S.J., and Jung, S.H. (2012), Analysis technique for chloride penetration in cracked concrete using equivalent diffusion and permeation,Construction and Building Materials, 29(2), 183-192. https://doi.org/10.1016/j.conbuildmat.2011.09.019
  21. RILEM (1994), Durability Design of Concrete Structures, Report of RILEM Technical Committee 130-CSL, E&FN, 28-52.
  22. Song, H-W, Cho, H.J., Park, S.S., and Byun, K.J. (2001). Early-age cracking resistance evaluation of concrete structure. Concrete Science Engineering, 3(1), 62-72.
  23. Song, H-W., Shim, H-B., Petcherdchoo, A., and Park, S-K. (2009), Service life prediction of repaired concrete structures under chloride environment using finite difference method, Cement and Concrete Composites, 31(2), 120-127. https://doi.org/10.1016/j.cemconcomp.2008.11.002
  24. Tae, S.H., Park, J.H., and Kim, T.H. (2011), A development on the optimal design evaluation system of $CO_2$ emission and economical efficiency in the life cycle of concrete, Journal of the Korea concrete institute, 23(6), 43-47 [in Korean].
  25. Thomas, M. D. A. and Bamforth, P. B. (1999), Modeling 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
  26. Thomas M.D.A. and Bentz EC.(2002), Computer Program for Predicting The Service Life and Life-Cycle Costs of Reinforced Concrete Exposed to Chlorides. Life365 Manual, SFA.

피인용 문헌

  1. CO2 Emission and Storage Evaluation of RC Underground Structure under Carbonation Considering Service Life and Mix Conditions with Fly Ash vol.14, pp.12, 2014, https://doi.org/10.5392/JKCA.2014.14.12.999