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Penetration Properties of Airborne Chlorides on Concrete Exposed in Marine Environment

해안환경에 노출된 콘크리트의 비래염분 침투 특성

  • Lee, Jong-Suk (Structural Engineering Research Division, Korea Institute of Construction Technology) ;
  • An, Gi-Hong (Structural Engineering Research Division, Korea Institute of Construction Technology)
  • 이종석 (한국건설기술연구원 인프라구조연구실) ;
  • 안기홍 (한국건설기술연구원 인프라구조연구실)
  • Received : 2012.03.21
  • Accepted : 2012.06.25
  • Published : 2012.10.31

Abstract

Airborne chlorides are transported to inland by sea wind to be attached to seashore concrete structure surface then penetrated into concrete structure members. Since the surface attached chloride amount are dependent on the amount of airborne chlorides, the prediction of distribution of airborne chlorides is important information in preventing chloride corrosion problems in seashore concrete structures. The prediction of surface chloride amount from airborne chlorides environment is extremely difficult than concrete directly in contact with seawater. In addition, their penetrating tendency is different from that of concrete immersed in seawater. In this study, properties of surface and penetrated chlorides under airborne chlorides environment are investigated. Concrete specimens were manufactured and exposed to marine environment for 3 years. The specimens were analyzed at the time durations of 1, 2, and 3 years to check surface chloride amount to penetrated chloride depth. The results revealed that there were certain differences according to surface roughness of concrete and with and without washing effect due to rainfalls. The evaluation results showed that penetrated chlorides depend on amount of airborne chlorides and duration of exposure. In addition, a notable tendency of having deeper chloride penetration and higher chloride content in concrete members under long-term exposure was observed.

References

  1. Thomas, M., "Chloride Thresholds in Marine Concrete," Cement and Concrete Research, Vol. 26, No. 4, 1996, pp. 513-519. https://doi.org/10.1016/0008-8846(96)00035-X
  2. Thomas, M. D. A. and Matthewsb, J. D., "Performance of pfa Concrete in a Marine Environment-10-Year Results," Cement and Concrete Composites, Vol. 26, No. 1, 2004, pp. 5-20. https://doi.org/10.1016/S0958-9465(02)00117-8
  3. Sandberg, P., Tang, L., and Andersen, A., "Recurrent Studies of Chloride Ingress in Uncracked Marine Concrete," Cement and Concrete Research, Vol. 28, No. 10, 1998, pp. 1489-1503. https://doi.org/10.1016/S0008-8846(98)00124-0
  4. Ann, K. Y., Ahn, J. H., and Ryou, J. S., "The Importance of Chloride Content at the Concrete Surface in Assessing the Time to Corrosion of Steel in Concrete Structures," Construction and Building Materials, Vol. 23, Issue 1, 2009, pp. 239-245. https://doi.org/10.1016/j.conbuildmat.2007.12.014
  5. Song, H. W., Lee, C. H., and Ann, K. Y., "Factors Influencing Chloride Transport in Concrete Structures Exposed to Marine Environments," Cement and Concrete Composites, Vol. 30, Issue 2, 2008, pp. 113-121. https://doi.org/10.1016/j.cemconcomp.2007.09.005
  6. Castro, P., De Rincon, O. T., and Pazini, E. J., "Interpretation of Chloride Profiles from Concrete Exposed to Tropical Marine Environments," Cement and Concrete Research, Vol. 31, Issue 4, 2001, pp. 529-537. https://doi.org/10.1016/S0008-8846(01)00453-7
  7. Roy, S. K., Chye, L. K., and Northwood, D. O., "Chloride Ingress in Concrete as Measured by Field Exposure Tests in the Atmospheric, Tidal and Submerged Zones of a Tropical Marine Environment," Cement and Concrete Research, Vol. 23, No. 6, 1993, pp. 1289-1306. https://doi.org/10.1016/0008-8846(93)90067-J
  8. Mustafa, M. A. and Yusof, K. M., "Atmospheric Chloride Penetration into Concrete in Semitropical Marine Environment," Cement and Concrete Research, Vol. 24, No. 4, 1994, pp. 661-670. https://doi.org/10.1016/0008-8846(94)90190-2
  9. Meira, G. R., Andrade, C., Padaratz, I. J., Alonso, C., and Borba Jr., J. C., "Chloride Penetration into Concrete Structures in the Marine Atmosphere Zone-Relationship between Deposition of Chlorides on the Wet Candle and Chlorides Accumulated into Concrete," Cement and Concrete Composites, Vol. 29, No. 9, 2007, pp. 667-676. https://doi.org/10.1016/j.cemconcomp.2007.05.009
  10. Swatekititham, S., "Computational Model for Chloride Concentration on Concrete Surface under Actual Environmental Condition," PhD Dissertation, Kochi University, Japan, 2004, 71 pp.
  11. Abu-Tair, A. I., Lavery, D., Nadjai, A., Rigden, S. R., and Ahmed, T. M. A., "A New Method for Evaluating the Surface Roughness of Concrete Cut for Repair or Strengthening," Construction and Building Materials, Vol. 14, No. 3, 2000, pp. 171-176. https://doi.org/10.1016/S0950-0618(00)00016-7
  12. Andrzej Garbacz, Luc Courard, and Katarzyna Kostana, "Characterization of Concrete Surface Roughness and Its Relation to Adhesion in Repair Systems," Materials Characterization, Vol. 56, No. 4-5, pp. 281-289.
  13. Moon, H. Y. and Lee, J. S., "A Study on Performance of Devices for Measuring the Sea-Salt Flying to the concrete Structures in the Seashore," Journal of Korean Society of Civil Engineers, Vol. 24, No. 2A, 2004, pp. 417-422.
  14. KSF2713, "Testing Method for Analysis of Chloride in Concrete and Concrete Raw Materials," Korean Agency for Technology and Standards, 2002, 8 pp.
  15. Meira, G. R., Andrade, C., Alonso, C., Borba Jr., J. C., and Padilha Jr., M., "Durability of Concrete Structures in Marine Atmosphere Zones-The Use of Chloride Deposition Rate on the Wet Candle as an Environmental Indicator," Cement and Concrete Composites, Vol. 32, Issue 6, 2010, pp. 427-435. https://doi.org/10.1016/j.cemconcomp.2010.03.002