콘크리트학회논문집 (Journal of the Korea Concrete Institute)

  • 제25권4호
  • /
  • Pages.411-418
  • /
  • 2013
  • /
  • 1229-5515(pISSN)
  • /
  • 2234-2842(eISSN)
한국콘크리트학회 (Korea Concrete Institute)
권호 표지
DOI QR코드

DOI QR Code

결합재 종류에 따른 해양 콘크리트의 강도 발현, 염화물 확산 및 단열온도 상승 특성에 대한 비교 연구

A Comparative Study on Strength Development, Chloride Diffusivity and Adiabatic Temperature Rise of Marine Concrete Depending on Binder Type

  • 투고 : 2012.12.12
  • 심사 : 2013.03.20
  • 발행 : 2013.08.31
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

최근 해양 콘크리트 구조물의 염해 및 수화열 저감을 위한 재료적 대책으로 혼합시멘트의 사용이 증가하고 있다. 혼합시멘트는 염해 및 수화열 저감 성능이 우수한 결합재이지만 재령 28일까지의 압축강도 발현이 작은 특징이 있다. 그러나 현행 해양 콘크리트 시방 규정은 높은 수준의 설계기준 압축강도를 재령 28일에 엄격히 만족하도록 되어 있다. 따라서 혼합시멘트를 사용하면 물-결합재비는 작고 단위결합재량은 많은 해양 콘크리트 배합이 예상된다. 이와 같이 높은 압축강도 위주의 해양 콘크리트 배합은 염해 내구성 확보에 유리하지만 수화열 저감에는 불리하다. 따라서 이 연구에서는 물-결합재비 및 결합재 종류에 따른 해양 콘크리트의 재료적 특성을 실험적으로 검토하고 예측하였다. 검토 및 예측 결과, 고로슬래그시멘트(BSC) 및 삼성분계 혼합시멘트(TBC) 배합은 1종 보통포틀랜드시멘트(OPC) 배합보다 재령 28일까지의 압축강도 발현은 상대적으로 작지만 재령 56일에는 유사한 압축강도를 발현하였으며 염해 및 수화열에 유리한 것으로 나타났다. 그러나 현행 해양 콘크리트의 최소 설계기준 압축강도를 만족하기 위해서는 단열온도 상승량이 크게 증가하는 것으로 예측되어 이에 대한 대책이 필요할 것으로 판단된다.

Recently, in order to reduce a damage of chloride attack and hydration heat in marine concrete structures, blended cement in mixing the marine concrete is widely used. Long term strength development is distinct in concrete with blended cement and it also has excellent resistance to chloride attack and reduction of hydration heat. However, blended cement has a characteristic of relatively low compressive strength in early age of 28 days. On the other hand, a high level of compressive strength is required in the Standard Specification for marine concrete mix design. Such concrete mix design satisfying Standard Specification is effective to chloride attack but disadvantageous for hydration heat reduction due to large quantity of binder. In this study, the material properties of marine concrete considering water-binder ratio and binder type are experimentally investigated. Through the research results, compressive strength in blended cement at the age of 56 days is similar although it has smaller compressive strength at the age of 28 days compared with result of OPC (ordinary portland cement). Even though blended cement has a large water-binder ratio and small unit of binder content, chloride ion diffusion coefficient is still small and hydration heat is also found to be reduced. For meeting the required compressive strength in Standard Specification for marine concrete at 28 days, the increased unit content of binder is needed but the increased hydration heat is also expected.

키워드

참고문헌

  1. Kwon, S. J., Song, H. W., and Byun, K. J., "A Study on Analysis Technique for Chloride Penetration in Cracked Concrete under Combined Deterioration," Journal of the Korea Concrete Institute, Vol. 19, No. 3, 2007, pp. 359-366. https://doi.org/10.4334/JKCI.2007.19.3.359
  2. Koh, K. T., Jang, I. Y., Kim, S. W., and Lee, K. M., "Materials and Construction of Off-Shore Concrete Structures," Magazine of the Korea Concrete Institute, Vol. 16, No. 6, 2004, pp. 26-30.
  3. M, Funahashi, "Predicting Corrosion-Free Service Life of a Concrete Structure in a Chloride Environment," ACI Materials Journal, Vol. 87, No. 6, 1990, pp. 581-587.
  4. Kim, Y. G. and Cho, B. Y., "Performance Based Durability Design of Concrete Structures for Chloride Attack," Magazine of the Korea Concrete Institute, Vol. 18, No. 4, 2006, pp. 32-40.
  5. Chang, C. H. and Jung, Y. W., "The Study on High Performance of Offshore Concrete Using Crushed Stone Fines," Journal of the Korean Society of Marine Environment & Safety, Vol. 15, No. 2, 2009, pp. 135-142.
  6. Kang, S. P. and Kim, J. H., "Improvement of Durability and Change of Pore Structure for Concrete Surface by the Penetrative Surface Protection Agent," Journal of the Korea Concrete Institute, Vol. 18, No. 1, 2006, pp. 125-132. https://doi.org/10.4334/JKCI.2006.18.1.125
  7. Seo, S. H., Kim, D. W., Kim, P. S., Kim, Y. J., and Yoon, K. H., "Study on the Properties of Mass Concrete Using the Low Heat Materials," Proceedings of the Korea Concrete Institute, Vol. 23, No. 1, 2011, pp. 683-684.
  8. Kim, Y. R., Song, Y. C., Kim, O. J., Park, J. H., Yoo, J. H., and Jeong, Y., "A Study on the Field Application of Low Heat Concrete Using High Volume Mineral Admixture," Proceedings of the Korea Concrete Institute, Vol. 23, No. 1, 2011, pp. 303-304.
  9. Song, H. W., Lee, C. H., Lee, K. C., Kim, J. H., and Ann, K. Y., "Chloride Penetration Resistance of Ternary Blended Concrete and Discussion for Durability," Journal of the Korea Concrete Institute, Vol. 20, No. 4, 2008, pp. 439-449. https://doi.org/10.4334/JKCI.2008.20.4.439
  10. Bae, J. Y., Jang, Y. I., Park, S. B., and Kim, Y. Y., "An Experimental Study on the Compressive Strength and Chloride Diffusivity of Mortar Produced with Multiple Mixed Cement by the Experiments Design," Journal of Material Cycles and Waste Management, Vol. 28, No. 2, 2011, pp. 165-174.
  11. Moon, H. Y., Jeon, J. K., and Kim, H. S., "Resistance on the Sulfuric Acid Corrosion of Cement Matrix Containing Mineral Admixtures," Journal of the Korean Society of Civil Engineers, Vol. 25, No. 1, 2005, pp. 225-232.
  12. Ministry of Land, Infrastructure and Transport, Standard Concrete Specification, Korea Concrete Institute, 2009, pp. 360.
  13. BS 8500, Concrete Complementary British Standard to BS EN 206-1, Part 1: Method of Specifying and Guidance for the Specifier, British Standard, 2006,
  14. ACI 201, ACI Manual of Concrete Practice 2000, Materials and General Properties of Concrete, Chapter 2-Aggressive Chemical Exposure, American Concrete Institute, 2009, pp. 8-12.
  15. Korea Concrete Institute, Concrete Design Code and Commentary, Kimoondang Publishing Company, 2008, 523 pp.
  16. Nordtest Method, NT BUILD 492, Concrete, Mortar and Cement-Based Repair Materials, Chloride Migration Coefficient from Non-Steady-State Migration Experiments, Nordtest, Finland, 1999.
  17. Song, R. F., Lee, C. H., Baek, D. H., Han, M. C., Choi, E. K., and Han, C. G., "A Basic Study on the Improvement of the Quality of the Cement Mortar with Recycled Fine Aggregates Based on Fly Ash," Proceedings of the Korean Recycled Construction Resource Institute, Vol. 9, No. 2, 2009, pp. 41-44.
  18. Kang, S. H., Lee, Y. H., Jeong, H. J., and Park, C. L., "An Experimental Study on the Evaluation of Adiabatic Temperature Rise of Concrete," Journal of the Korea Concrete Institute, Vol. 7, No. 6, 1995, pp. 186-196.