Journal of the Korean Recycled Construction Resources Institute (한국건설순환자원학회논문집)

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

DOI QR Code

Evaluation of Chloride Penetration in Concrete with Ground Granulated Blast Furnace Slag considering Fineness and Replacement Ratio

고로슬래그 미분말 콘크리트의 분말도 및 치환율에 따른 염해 저항성 평가

  • Lee, Hyun-Ho (Donyang University, Architecture and Fire Administration) ;
  • Kwon, Seung-Jun (Hannam University, Civil and Environmental Eng.)
  • 이현호 (동양대학교 건축소방행정학과) ;
  • 권성준 (한남대학교 건설시스템공학과)
  • Received : 2013.05.09
  • Accepted : 2013.06.21
  • Published : 2013.06.30
Download PDF
⟨ Previous Next ⟩

Abstract

Durability performance in RC structures varies significantly with changes in cover depth and mix proportions. GGBFS (Ground Granulated Blast Furnace Slag) is very effective mineral admixture and widely used for an improved resistance to chloride attack. In this paper, characteristics such as porosity, compressive strength, and diffusion coefficient are evaluated in GGBFS concrete with 30~70% of replacement ratio and $4,000{\sim}8,000cm^2/g$ of fineness. Through the tests, more dense pore structure, higher compressive strength, and lower diffusion coefficient are obtained in GGBFS concrete, which are evaluated to be more dependent on replacement ratio than fineness. With increasing curing period from 3 to 91 days, porosity decreases to 77.47% and strength increases to 373% in GGBFS concrete. Chloride diffusion coefficient in GGBFS concrete decreases to 64.4% compared with that in OPC concrete, which shows significant improvement of durability performance.

RC 구조물의 내구성능 피복두께의 변화뿐 아니라 배합조건에 따라 크게 변화한다. 고로슬래그 미분말은 유용한 혼화재료이며, 최근들어 염해에 대한 저항성을 확보하기 위해 많이 사용되고 있다. 본 연구는 고로슬래그 미분말을 30~70%로, 분말도를 $4,000{\sim}8,000cm^2/g$으로 변화시키면서 공극률, 압축강도, 확산계수의 변화를 분석하였다. 실험결과 고로슬래그 미분말을 혼입한 콘크리트는 보통 콘크리트에 비하여 조밀한 공극구조, 높은 강도발현과 확산계수 감소를 확보하였으며, 분말도보다 치환율에 더욱 민감하게 변화하였다. 고로슬래그 미분말 콘크리트에서 재령이 3일에서 91일로 증가함에 따라 공극률은 77.47% 수준으로 감소하였으며, 압축강도는 373%로 증가하였다. 또한 염화물 확산계수는 OPC 콘크리트의 64.4% 수준으로 감소하여 내구적 저항성이 크게 개선됨을 알 수 있었다.

Keywords

References

  1. Broomfield, J.P. (1997). Corrosion of Steel in Concrete:understanding, investigation and repair, London, E&FN, 272-278.
  2. JSCE-Concrete committee. (2002). Standard specification for concrete structures.
  3. Korea Concrete Institute. (2004). Concrete Standard Specification-Durability Part [in Korean].
  4. Korea Expressway Corporation. (1999). Characteristics Study with Cement Type for Concrete Durability Improvement of RC, Technical Report, 129-133 [in Korean].
  5. Lee, H.S., and Kwon, S.J. (2012). "Analysis Technique for Chloride Behavior using Apparent Diffusion Coefficient of Chloride Ion from Neural Network Algorithm," Journal of the Korea Concrete Institute, 24(4), 481-490 [in Korean]. https://doi.org/10.4334/JKCI.2012.24.4.481
  6. Maekawa, K., Chaube, R., and Kishi, T. (1999). Modeling of Concrete Performance: Hydration, Microstructure Formation and Mass Transport, Routledge, London and New York, 150-177.
  7. 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
  8. Kwon, S.J., Lee, H.S., and Park, S.G. (2012). "Effect of Additional Water on Durability and Pore Size Distribution in Cement Mortar," Journal of the Korea Institute for Structural Maintenance and Inspection, 16(3), 75-83.
  9. Kwon, S.J., Na, U.J., Park, S.S., and Jung, S.H. (2009). "Service Life Prediction of Concrete Wharves with Early-Aged Crack : Probabilistic Approach for Chloride Diffusion," Structural Safety, 31(1), 75-83. https://doi.org/10.1016/j.strusafe.2008.03.004
  10. 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].
  11. RILEM. (1994). Durability Design of Concrete Structures, Report of RILEM Technical Committee 130-CSL, E&FN, 28-52.
  12. Samsung Construction. (2003). Evaluation for Diffusivity Characteristics in High Durable Concrete, Technical Report, Seoul, Korea, 27-33 [in Korean].
  13. Song, H.W., and Kwon, S.J. (2007). "Permeability Characteristics of Carbonated Concrete Considering Capillary Pore Structure," Cement and Concrete Research, 37(6), 909-915. https://doi.org/10.1016/j.cemconres.2007.03.011
  14. Song, H.W., and Kwon, S.J. (2009). "Evaluation of Chloride Penetration in High Performance Concrete Using Neural Network Algorithm and Micro Pore Structure," Cement and Concrete Research, 39(9), 814-824. https://doi.org/10.1016/j.cemconres.2009.05.013
  15. Song H.W., Pack, S.W., Lee, C.H., and Kwon, S.J. (2006). "Service Life Prediction of Concrete Structures under Marine Environment Considering Coupled Deterioration," Journal of Building and Monuments, 12(1), 265-284.
  16. Tang, L., and Nilsson, L.O. (1993). "Chloride Binding Capacity and Binding Isotherms of OPC Paste and Mortar," Cement and Concrete Research, 23(2), 347-353. https://doi.org/10.1016/0008-8846(93)90100-N

Cited by

  1. Evaluation of Durability Performance of Fly Ash Blended Concrete due to Fly Ash Replacement with Tire Derived Fuel Ash vol.28, pp.6, 2016, https://doi.org/10.4334/JKCI.2016.28.6.647
  2. Effects of Mineral Admixture on the Characteristics of Grout for PSC Bridge vol.2, pp.1, 2014, https://doi.org/10.14190/JRCR.2014.2.1.026