Journal of the Society of Disaster Information (한국재난정보학회 논문집)

The Korean Society of Disaster Information (한국재난정보학회)
권호 표지
DOI QR코드

DOI QR Code

Estimation of Service Life for Expressway Bridge Subjected to Chloride Ingress from De-icer

동절기 제설제 사용에 대한 고속도로 교량의 내구수명 평가

  • Received : 2015.11.05
  • Accepted : 2015.12.24
  • Published : 2015.12.31
Download PDF
⟨ Previous Next ⟩

Abstract

This paper aims to estimate the service life of the target bridge structures subjected to chloride ingress from de-icer, which is used for safety of vehicles in winter, by investigating the chloride ingress into concrete. In this study, the 10-year-old bridge structures were investigated by measuring the chloride along the depth from the exposed surface to derive the surface chloride concentration and the diffusion coefficient for the prediction of service life. The service life of each measured point on the structures were estimated with the surface chloride concentration and the diffusion coefficient by using Life-365 software. As a result, it was estimated for all measured points to have over 100-year service life. Furthermore, the diffusion coefficient and the service life from the measured data were compared to another method calculated with the concrete mix, considering the time dependency of diffusion coefficient.

본 연구에서는 동절기 교통안전을 위해 교량 구조물에 사용되는 제설제에 의한 염화물 침투 특성을 조사하여 사용수명을 평가하기 위해 수행되었다. 이 연구에서는 준공 후 공용기간이 약 10년이 경과한 10개 교량의 지점에서 깊이별 염화물 농도 분포를 조사하여 제설제에 의한 염해를 예측하기 위한 표면 염화물 농도와 확산계수를 도출하였다. 얻어진 정보를 바탕으로 Life-365 프로그램을 이용하여 각 지점의 사용수명을 평가하였다. 대상 교량의 사용수명 평가 결과 10개 지점 모두 100년 이상의 사용수명을 가질 것으로 판단되었다. 추가적으로 콘크리트의 배합에 기인한 확산계수를 구하여 제설제에 의한 염해와 해수에 의한 염해의 경우에 대해 확산특성을 비교 분석하고 사용수명을 평가하였다.

Keywords

References

  1. ACI Committee 365 (2001) Service life prediction-state of-the-art report. Manual of Concrete Practice, ACI 365.1R-00-44.
  2. Amey, S.L., Johnson, D.A., Miltenberger, M.A., Farzam, H. (1998) "Predicting the service life of concrete marin structures:an environmental methodology" ACI Structural Journal, Vol. 95, No. 2, pp.205-214.
  3. DuraCrete (2000) 'General guidelines for durability design and redesign', Probabilistic Performance based Durability Design of Concrete Structures, Report No. 15 in EU-Project(Brite EuRam III) No. BE95-1347, Gouda, The Netherlands.
  4. Fib (2006) 'Model code for service-life design', fib bulletin, 1st ed., p.34, Federation International du Beton, Lausanne, Switzerland.
  5. Jeon, C.K., Jeon, J.K., (2013). "A Experimnetal Study on the Field Application of Concrete with $Co_2$ Reduction Materials", Journal of Korea Society of Disaster Information, Vol. 9, No. 2, pp.128-136.
  6. Kim, D.B., Kwon, S.D., An, K.H. (2015) "A Study on the Allowable Crack Width of RC Beam with Corrosive Environment", Journal of Korea Society of Disaster Information, Vol.11, No.2, pp.253-261. https://doi.org/10.15683/kosdi.2015.11.2.253
  7. Korea Concrete Institute (2009) Standard Specification for Concrete commentary. Supplement II-Durability evaluation of concrete Evaluation of Durability.
  8. Lee, C.S., Yoon, I.S., Park, J.H., (2003). "Prediction of Time to Corrosion for Concrete Bridge Decks Exposed to De-Icing Chemicals " Journal of Korea Concrete Institute, Vol. 15, No. 4, pp.606-614. https://doi.org/10.4334/JKCI.2003.15.4.606
  9. Life-365 user manual (2013) Service life prediction model.
  10. Maage, M., Helland, S., Poulsen, E., Vennesland, O., Carlsen, J.E. (1996) "Service life prediction of existing concrete structures exposed to marine environment" ACI Materials Journal, Vol. 93, No. 6, pp.1-8.
  11. Maage, M., Poulsen, E., Vennesland, O. and Carlsen, J.E. (1995) 'Service life model for concrete structures exposed to marine environment', LIGHTCON Report No. 2.4, STF70 A94082 SINTEF, Trondheim, Norway
  12. NordTest (1999) 'Concrete, mortar and cement based repair materials: chloride migration coefficient from non-steady state migration experiments', NT BUILD 492, Helsinki, Finland.
  13. Park, C.B., (2001). "The Snowy Road Problem and improvement method", Korean Society of Civil Engineers, Vol. 49, No. 4, pp.49-51.
  14. Park, S.B., Kim, D.G., (2000). "A Experimental Study on the Chloride Diffusion Properties in Concrete", Journal of Concrete Instiotute, Vol.12, No.1, pp.33-44.
  15. Song, H.W., Lee, C.H., Lee, K.C., Kim, J.H., Ann, K.Y., (2008) "Chloride Penetration Resistance of Ternary Blended Concrete and Discussion for Durability ", Journal of Korea Concrete Institute, Vol. 20, No. 4, pp.439-449. https://doi.org/10.4334/JKCI.2008.20.4.439
  16. Tang, L. and Lindvall, Anders, (2013). "Validation of models for prediction of chloride ingress in concrete exposed in de-icing salt road environment" International Journal of Structural Engineering, Vol. 4, pp.86-99. https://doi.org/10.1504/IJSTRUCTE.2013.050766
  17. Tang, L. (2008) 'Engineering expression of the ClinConc model for prediction of free and total chloride ingress in submerged marine concrete', Cem. Concr. Res., Vol. 38, Nos. 8-9, pp.1092-1097. https://doi.org/10.1016/j.cemconres.2008.03.008
  18. Tang, L. (2007) 'Service-life prediction based on the rapid migration test and the ClinConc model', in Baroghel-Bouny, V. et al. (Eds.): RILEM Proceedings PRO 047: 'Performance Based Evaluation and Indicators for Concrete Durability', pp.157-164, RILEM Publications.
  19. Yang, E,I., Kim, M.Y., Park H.G., (2008). "Field Investigation of Chloride Penetration and Evaluation of Corrosion Characteristics for Deicer " The Journal of Korean Society of Hazard Mitigation, Vol. 8, No. 6, pp.47-52.
  20. Yun, D.G., Jeong, J.H., (2006). "Performance and Adequate Usage of Deicing Materials " The Journal of Korean Society of Road Engineers, Vol. 8, No. 1, pp.55-64.