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 Drying and Autogeneous Shrinkage in HPC with 65% Replacement of GGBFS

고로슬래그 미분말을 65% 치환한 고성능 콘크리트의 자기 및 건조수축 특성

  • 장승엽 (한국철도기술연구원) ;
  • 류화성 ((주)한양E&C) ;
  • 윤용식 (한남대학교 건설시스템공학과) ;
  • 권성준 (한남대학교 건설시스템공학과)
  • Received : 2017.01.20
  • Accepted : 2017.03.20
  • Published : 2017.05.01
Download PDF
⟨ Previous Next ⟩

Abstract

GGBFS (Ground Granulated Blast Furnace Slag) is a byproduct with engineering advantages and HVSC (High Volume Slag Concrete) is widely attempted due to active utilization and reduction of eco-load. In the present work, characteristics of drying shrinkage and early-aged behavior are evaluated for the concrete with 65% replacement ratio of GGBFS and 50MPa of design strength. For the work, 3 different mix conditions are considered and several tests including slump flow, compressive strength, drying and autogeneous shrinkage are performed. From the test, OPC 100 mixture without replacement shows higher strength development before 7 days, however the strength reduction in concrete replaced with GGBFS is not significant due to sufficient free water for cement hydration. OPC 100 mixture also shows significant drying shrinkage due to a great autogeneous shrinkage before 3 days. In the concrete with GGBFS replacement, the drying shrinkage behavior is improved due to relatively small deformation by autogeneous shrinkage. The mixture (OPT BS 65) with lower w/b ratio (0.27) and unit content of water ($160kg/m^3$) shows more improved shrinkage behavior than BS 65 mixture which has simple replacement of GGBFS with 0.30 of w/b and $165kg/m^3$ of water unit content.

고로슬래그 미분말은 공학적으로 우수한 건설산업 부산물이며, 최근들어 환경부하 저감 및 사용 활성화를 위해 대단위 슬래그 치환 콘크리트가 많이 연구되고 있다. 본 연구에서는 목표 강도를 50 MPa로 설정하고 고로슬래그미분말 치환률을 65%로 고려한 대단위 치환 슬래그 콘크리트를 제조하여 건조수축특성과 초지재령 특성을 평가하였다. 이를 위해 3 수준의 콘크리트를 제조하였으며, 슬럼프 플로우, 강도, 건조 및 자기수축에 대한 실험을 수행하였다. 실험결과, 보통 포틀랜트 시멘트를 100% 함유한 콘크리트(OPC 100)에 비하여 재령 7일전의 강도는 약간 감소하였으나, 슬래그 치환 배합은 수화에 필요한 충분한 자유수를 가졌으므로 28일 재령에서는 우수한 강도 발현을 나타내었다. 또한 재령 3일까지 큰 자기수축으로 인하여, OPC 100 배합에서는 건조수축이 크게 평가되었지만, 65% 고로슬래그 미분말을 치환한 배합에서는 초기재령의 자기수축 성능이 개선되어 우수한 건조수축거동을 나타내었다. 특히 단순 질량 치환배합(BS 65)보다 물-결합재비(0.27)와 단위수량($163kg/m^3$)을 낮춘 OPTBS 65에서 더욱 우수한 건조수축 및 자기수축 거동을 나타내었다.

Keywords

References

  1. Oh, K.-S., Mun, J.-M., and Kwon, S.-J. (2016), Chloride Diffusion Coefficients in Cold Joint Concrete with GGBFS, Journal of the Korea Institute for Structural Maintenance and Inspection, 20(5), 44-49. https://doi.org/10.11112/jksmi.2016.20.5.044
  2. Chindaprasirt, P., and Rukzon, S. (2008), Strength, porosity and corrosion resistance of ternary blend Portland cement, rice husk ash and fly ash mortar, Construction and Building Materials, 22(8), 1601-1606. https://doi.org/10.1016/j.conbuildmat.2007.06.010
  3. Copeland, L. E., and Kantro, D. L. (1968), Hydration of Portland cement, Proceedings of 5th International Symposium on the Chemistry of Cement, 378-420.
  4. Ary, C., Buenfeld, N. R., and Newmann, J. B. (1990), Factors Influencing Chloride Binding in Concrete, Cement and Concrete Research, 20(2), 291-300. https://doi.org/10.1016/0008-8846(90)90083-A
  5. Erdem, T. K., and Kirca, O. (2008), Use of binary and ternary blends in high strength concrete, Construction and Building Materials, 22(7), 1477-1483. https://doi.org/10.1016/j.conbuildmat.2007.03.026
  6. Escalante, J. I., Gómez, L. Y., Johal, K. K., Mendoza, G., Mancha, H., and Mendez, J. (2001), Reactivity of blast-furnace slag in Portland cement blends hydrated under different conditions, Cement and Concrete Research, 31(10), 1403-1409. https://doi.org/10.1016/S0008-8846(01)00587-7
  7. Escalante-Garcia, J. I., and Sharp, J. H. (1998), Effect of temperature on the hydration of the main clinker phases in Portland cements: Part II. Blended cements, Cement and Concrete Research, 28(9), 1259-1274. https://doi.org/10.1016/S0008-8846(98)00107-0
  8. ISO 14040. (2006), Environmental Management-Life cycle Assessment- Principles and Framework, International Organization for Standardization.
  9. Japan Concrete Institute. (1998), Technical committee report on autogenous shrinkage, E&FN, London, 1-3.
  10. Jaung, J. D., Cho, H. D., and Park, S. W. (2012), Properties of Hydration Heat of High-Strength Concrete and Reduction Strategy for Heat Production, Journal of the Korea Institute of Building Construction, 12(2), 203-210. https://doi.org/10.5345/JKIBC.2012.12.2.203
  11. Jeong, J. Y., Jang, S. Y., Choi, Y. C., Jung, S. H., and Kim, J. I. (2015(a)), Effects of replacement ratio and fineness of GGBFS on the hydration and pozzolanic reaction of high-strength high-volume GGBFS blended cement pastes, Journal of the Korea Concrete Institute, 27(2), 115-125. https://doi.org/10.4334/JKCI.2015.27.2.115
  12. Jeong, J. Y., Jang, S. Y., Choi, Y. C., Jung, S. H., and Kim, S. I. (2015(b)), Effect of Limestone Powder and Silica Fume on the Hydration and Pozzolanic Reaction of High-Strength High-Volume GGBFS Blended Cement Mortars, Journal of the Korea Concrete Institute, 27(2), 127-136. https://doi.org/10.4334/JKCI.2015.27.2.127
  13. Lee, K. M., Lee, H. K., Lee, S. H., and Kim, G. Y. (2006), Autogenous shrinkage of concrete containing granulated blast-furnace slag, Cement and Concrete Research, 36(7), 1279-1285. https://doi.org/10.1016/j.cemconres.2006.01.005
  14. Lee, S. H., Park, W. J., and Lee, H. S. (2013), Life cycle $CO_2$ assessment method for concrete using $CO_2$ balance and suggestion to decrease $LCCO_2$ of concrete in South-Korean apartment, Energy and Buildings, 58, 93-102. https://doi.org/10.1016/j.enbuild.2012.11.034
  15. Miyazawa, S., and Tazawa, E. (2001), Prediction model for shrinkage of concrete including autogenous shrinkage, creep, shrinkage and durability mechanics of concrete and other quasi-brittle materials. Proceedings of 6th International Conference Elsevier Science Ltd, 735-46.
  16. Mullick, A. K. (2007), Performance of concrete with binary and ternary cement blends, The Indian Concrete Journal, 81(1), 15-22.
  17. Narayanan, N. (2008), Quantifying the effects of hydration enhancement and dilution in cement pastes containing coarse glass powder, Journal of Advanced Concrete Technology, 6(3), 397-408. https://doi.org/10.3151/jact.6.397
  18. Samsung Construction. (2003), Evaluation for Diffusivity Characteristics in High Durable Concrete, Technical Report, Seoul, 27-33.
  19. 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
  20. Song, H. W., Kwon, S. J., Byun, K. J., and Park, C. K. (2006), Predicting carbonation in early-aged cracked concrete, Cement and Concrete Research, 36(5), 979-989. https://doi.org/10.1016/j.cemconres.2005.12.019
  21. Tazawa, E., and Miyazawa S. (1995), Influence of cement and admixture on autogenous shrinkage of cement paste, Cement and Concrete Research, 25(2), 281-287. https://doi.org/10.1016/0008-8846(95)00010-0
  22. Yoo, S. W., Koh, K. T., Kwon, S. J., and Park, S. G. (2013), Analysis technique for flexural behavior in RC beam considering autogenous shrinkage effect, Construction and Building Materials, 47, 560-568. https://doi.org/10.1016/j.conbuildmat.2013.05.061
  23. Yoo, S. W., Kwon, S. J., and Jung, S. H. (2012), Analysis technique for autogenous shrinkage in high performance concrete with mineral and chemical admixtures, Construction and Building Materials, 34, 1-10. https://doi.org/10.1016/j.conbuildmat.2012.02.005