Journal of the Korea institute for structural maintenance and inspection (한국구조물진단유지관리공학회 논문집)

Korea Institute for Structural Maintenance Inspection (한국구조물진단유지관리공학회)
권호 표지
DOI QR코드

DOI QR Code

Characteristics of Calcium Leaching Resistance for Concrete Mixed with Mineral Admixture

광물질 혼화재를 혼합한 콘크리트의 칼슘용출 저항 특성

  • 최소영 (강릉원주대학교 토목공학과) ;
  • 최윤석 (한국건설생활환경시험연구원) ;
  • 양은익 (강릉원주대학교 토목공학과)
  • Received : 2016.02.26
  • Accepted : 2016.04.04
  • Published : 2016.07.01
Download PDF
⟨ Previous Next ⟩

Abstract

Concrete is a very useful construction material for the sealing disposal of hazardous substances. In general, mass concrete is applied to these structures. And, the mineral admixtures are recommended for the long term performance. Calcium leaching could be happened due to the contact with pure water in underground structures. Thus, it is needed to evaluate the resistance of calcium leaching for concrete mixed with mineral admixtures. From the test results, the mineral admixtures are effective to the improvement of long term compressive strength and chloride diffusion coefficient in concrete members. When calcium leaching is happened, however, the reduction of compressive strength and chloride penetration resistance is severe than OPC case, the micro pore distribution is adversely affected. Consequently, when the mineral admixtures are applied to underground structures which is exposed to calcium leaching environment, it is desirable to reduce water-to-binder ratio, to expose after the sufficient pozolanic reaction, and to use BFS than FA.

콘크리트는 유해물질을 봉함처리하기 위한 매우 유용한 건설재료이다. 일반적으로 이러한 시설물에는 매스콘크리트가 적용되며, 장기간 성능이 요구되므로 광물질 혼화재를 사용하는 것이 바람직하다. 지하구조물에서는 순수와의 접촉으로 칼슘용출이 발생할 수 있으므로 광물질 혼화재를 포함하고 있는 콘크리트의 칼슘용출 저항성을 평가할 필요가 있다. 실험결과에 따르면, 광물질 혼화재는 콘크리트 부재의 장기압축강도 및 염화물 확산계수 개선에 효과적이지만, 칼슘용출이 발생하면 압축강도 및 염화물 확산 저항성 저하가 OPC에 비해 심하고, 미세공극분포도 영향을 받는다. 따라서 칼슘용출환경에 노출되는 지하구조물에 광물질 혼화재가 적용될 경우에는, 물-결합재비를 저감시키며, 충분한 포졸란 반응 이후에 노출해야 하고, FA 보다는 BFS를 사용하는 것이 바람직하다.

Keywords

References

  1. ASTM D 4284 (2007), Standard Test Method for Determining Pore Volume Distribution of Catalysts by Mercury Intrusion Porosimetry, 2007.
  2. Bae, J. S., and Park, G. J. (2010), The Diffusion Property of Chloride Ion into Concrete by Electrically Accelerated Method, Journal of the Korea Institute for Structural Maintenance and Inspection, 14(3), 138-143(in Korean).
  3. Carde, C., Escadeillas, G., and Francois, R. (1997), Use of Ammonium Nitrate Solution to Simulate and Accelerate the Leaching of Cement Pastes due to Deionized Water, Magazine of Concrete Research, 49(181), 295-301. https://doi.org/10.1680/macr.1997.49.181.295
  4. Chio, Y. S., Jang, Y. H., Choi, S. Y., Kim, I. S., and Yang, E. I. (2014), Analytical Study on Structural Behavior of Surface Damaged Concrete Member by Calcium Leaching Degradation Journal of the Korea Institute for Structural Maintenance and Inspection, 18(4), 22-32 (in Korean). https://doi.org/10.11112/jksmi.2014.18.4.022
  5. Choi, Y. S., and Yang, E. I. (2013), Effect of Calcium Leaching on the Pore Structure, Strength, and Chloride Penetration Resistance in Concrete Specimens, Nuclear Engineering and Design, 237, 126-136.
  6. Haga, K., Sutou, S., and Hironaga, M. (2005), Effect of Porosity on Leaching of Ca from Hardened Ordinary Portland Cement Paste, Cement and Concrete Research, 35(9), 1764-1775. https://doi.org/10.1016/j.cemconres.2004.06.034
  7. Hauyan, M., Hongfa, Y., and Wei, S. (2013), Freezing-thawing Durability and its Improvement of High Strength Shrinkage Compensation Concrete with High Volume Mineral Admixtures, Construction and Building Materials, 39, 124-128. https://doi.org/10.1016/j.conbuildmat.2012.05.025
  8. Kari, O. P., and Puttonen J. (2014), Simulation of Concrete Deterioration in Finnish Rock Cavern Conditions for Final Disposal of Nuclear Waste, Annals of Nuclear Energy, 72, 20-30. https://doi.org/10.1016/j.anucene.2014.04.035
  9. Kim, J. Y., Kim, J. Y., Jung, H. R., and Kim, E. H. (2013), Gas Threshold Pressure and Gas Permeability of Silo Concrete Specimens for a low- and Intermediate-Level Waste Disposal Facility in Korea, Annals of Nuclear Energy, 55, 1-8. https://doi.org/10.1016/j.anucene.2012.12.012
  10. Kim, Y. K., Lee, B. S., and Lee, Y. H. (2005), A Study on the Methodology to Ensure Long-Term Durability of Low and Intermediate Level Radwaste Disposal Concrete Structure, Proceedings of the Korean Radioactive Waste Society Conference The Korean Radioactive Waste Society, 212-220(in Korean).
  11. Min, J. W. (2011), The Statistical Hypothesis Verification to Influence of Addition of Metakaolin and Silica Fume on Compressive Strength and Chloride Ion Penetration of High Strength Concrete, Journal of the Korea Institute for Structural Maintenance and Inspection, 15(1), 215-225(in Korean). https://doi.org/10.11112/jksmi.2011.15.1.215
  12. Saito, H., and Deguchi, A. (2000), Leaching Tests on Different Mortars Using Accelerated Electrochemical Method, Cement and Concrete Research, 30(11), 1815-1825. https://doi.org/10.1016/S0008-8846(00)00377-X
  13. Sheen, J. J. (2002), A Study on the Radiation Shielding Analysis for LILW Vitrification Facility, Department of Nuclear Engineering, 1-3(in Korean).
  14. Skoczylas, F., Agostini, F., and Lafhaj, Z. (2007), Experimental Study of Accelerated Leaching on Hollw Cylinders of Mortar, Cement and Concrete Research, 37(1), 71-78. https://doi.org/10.1016/j.cemconres.2006.09.018
  15. Tang, L., and Nilsson, L. O. (1992), Rapid Determination of the Chloride Diffusivity in Concrete by Applying an Electrical Field, ACI Material Journal, 89(1), 49-53.
  16. Torrenti, J. M., Nguyen, V. H. and Colina, H. (2007), Chemo-Mechanical Coupling Behaviour of Leached Concrete PartI: Experimental Results, Nuclear Engineering and Design, 237, 2083-2089. https://doi.org/10.1016/j.nucengdes.2007.02.013
  17. Turick, C. E., and Berry, C. J. (2016), Review of Concrete Biodeterioration in Relation to Nuclear Waste, Journal of Environmental Radioactivity, 151, 12-21. https://doi.org/10.1016/j.jenvrad.2015.09.005
  18. Yang, E. I., Jin, S. H., Kim, M. Y., and Choi, Y. S. (2011), Effect of Initial Flexural Crack on Resistance to Chloride Penetration into Reinforced Concrete Members, Journal of the Korea Institute for Structural Maintenance and Inspection, 15(2), 79-87(in Korean). https://doi.org/10.11112/jksmi.2011.15.2.079
  19. Yang, E. I., and Choi, Y. S. (2011), Characteristics of Pore Structures and Compressive Strength in Calcium Leached Concrete Specimens, Journal of the Korea Concrete Institute, 23(5), 647-656(in Korean). https://doi.org/10.4334/JKCI.2011.23.5.647

Cited by

  1. 칼슘용출 열화 조건에서 광물질 혼화재를 사용한 RC부재의 휨 거동에 관한 실험적 연구 vol.22, pp.2, 2016, https://doi.org/10.11112/jksmi.2018.22.2.016
  2. Analytical Study on the Flexural Behavior of Reinforced Concrete Beam with Mineral Admixture under Calcium Leaching Degradation vol.940, pp.None, 2016, https://doi.org/10.4028/www.scientific.net/msf.940.123
  3. An experimental study on the flexural behavior of RC member under long-term calcium leaching degradation vol.6, pp.1, 2021, https://doi.org/10.1080/24705314.2020.1824668