Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
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Fundamental Properties of Cement Composites Containing Lightly Burnt MgO Powders

저온 소성한 MgO 분말을 혼입한 시멘트 복합체의 기초 물성

  • Jang, Bong-Seok (K-water Institute, Korea Water Resources Corporation) ;
  • Kwon, Yong-Gil (K-water Institute, Korea Water Resources Corporation) ;
  • Choi, Seul-Woo (Dept. of Civil, Architectural and Environmental System Engineering, Sungkyunkwan University) ;
  • Lee, Kwang-Myong (Dept. of Civil, Architectural and Environmental System Engineering, Sungkyunkwan University)
  • 장봉석 (한국수자원공사 K-water 연구원) ;
  • 권용길 (한국수자원공사 K-water 연구원) ;
  • 최슬우 (성균관대학교 건설환경시스템공학과) ;
  • 이광명 (성균관대학교 건설환경시스템공학과)
  • Received : 2010.11.15
  • Accepted : 2011.02.28
  • Published : 2011.04.30
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Abstract

The volume change in concrete takes place with changes in temperature and water content immediately after concrete casting. In the early age stage, the thermal and drying shrinkages can cause cracks that are very crucial to the durability of concrete. It was reported that when the cement with lightly-burnt MgO powder was used, the shrinkage of concrete can be reduced. This study investigates fundamental properties of cement composites with lightly burnt MgO powder by performing various experiments. The stability test results verified that MgO powder in cement composites does not cause any abnormal expansion. Also, the hydrate product analysis results obtained from MgO cement paste showed that MgO powder reduces the shrinkage at the longterm ages. In addition, the cement composites containing the proper amount of MgO powder could improve compressive strength. Finally, the shrinkage reduction from using MgO powder can be optimized by increasing MgO replacement level and curing temperature.

콘크리트는 타설 직후부터 온도 및 수분의 변화로 인한 체적 변화가 일어난다. 특히 초기 재령에서 발생하는 온도 수축과 건조 수축은 콘크리트에 균열을 유발할 수 있으며, 이는 콘크리트 내구성에 큰 영향을 끼친다. 중국에서는 저온에서 소성된 산화마그네슘(MgO) 분말을 시멘트 대체재로 사용한 콘크리트를 구조물에 적용할 경우, 수축에 대한 보상 효과를 얻을 수 있는 것으로 보고된 바 있다. 이 연구에서는 실험을 통하여 저온 소성한 MgO를 혼입한 시멘트 복합체의 다양한 특성을 규명하고자 하였다. 안정성 시험 결과 MgO 분말의 혼입에 따른 이상팽창이 유발되지 않음을 확인하였으며, MgO의 수화생성물 분석을 통해 MgO 분말이 장기 재령에서 수축을 보상하는 것을 확인하였다. 또한 적당한 MgO 분말의 혼입은 시멘트 복합체의 압축강도를 증진시키는 효과가 있었으며, MgO 분말의 혼입률이 높거나 양생 온도가 높을수록 MgO 분말의 팽창성에 따른 수축 보완 효과가 크게 나타났다.

Keywords

References

  1. Metha, P. K. and Monteiro, P. J., Concrete : Structure, Properties, and Materials, 3rd edition, McGraw-Hill, USA, 2006, pp. 85-89.
  2. 김송호, “콘크리트 균열방지용 혼화재-팽창재,” 콘크리트학회지, 7권, 5호, 1995, pp. 106-110.
  3. 서경원, 백기현, 김영진, 곽도연, “팽창재에 의한 초고강도 콘크리트의 수축저감,” 콘크리트 학회지, 21권, 1호, 2009, pp. 61-67.
  4. Du, C., “A Review of Magnesium Oxide in Concrete,” Concrete International, Vol. 27, No. 12, 2005, pp. 45-50.
  5. Mo, L., Deng, M., and Tang, M., “Effects of Calcination Condition on Expansion Property of MgO-Type Expansive Agent Used in Cement-Based Materials,” Cement and Concrete Research, Vol. 40, No. 3, 2010, pp. 437-446. https://doi.org/10.1016/j.cemconres.2009.09.025
  6. Liu Z., Cui X., and Tang M., “MgO-Type Delayed Expansive Cement,” Cement and Concrete Research, Vol. 21, No. 6, 1991, pp. 1049-1057. https://doi.org/10.1016/0008-8846(91)90065-P
  7. Gao, P., Lu, X., Geng, F., Li, X., Hou, J., Lin, H., and Shi, N., “Production of MgO-Type Expansive Agent in Dam Concrete by Use of Industrial by-Products,” Building and Environment, Vol. 43, No. 4, 2008, pp. 453-457. https://doi.org/10.1016/j.buildenv.2007.01.037
  8. Gao, P., Wu, S., Lu, X., Deng, M., Lin, P., Wu, Z., and Tang, M., “Soundness Evaluation of Concrete with MgO,” Construction and Building Materials, Vol. 21, No. 1, 2007, pp. 132-138 https://doi.org/10.1016/j.conbuildmat.2005.06.033
  9. Lingling, X. and Deng, M., “Dolomite Used as Raw Material to Produce MgO-Based Expansive Agent,” Cement and Concrete Research, Vol. 35, No. 8, 2005, pp. 1480-1485. https://doi.org/10.1016/j.cemconres.2004.09.026
  10. Liu, Z., Cui X., and Tang, M., “Hydration and Setting Time of MgO-type Expansive Cement,” Cement and Concrete Research, Vol. 22, No. 1, 1992, pp. 1-5. https://doi.org/10.1016/0008-8846(92)90129-J
  11. He, Y. W. and Huang, X. T., “Application of MgO Concrete to Promote Development of Dam Construction,” Guangdong Water Resources and Hydropower, 2002 (Supplement), pp. 3-4 (in Chinese).
  12. Xu, J. B. and Huang, X. T., “Fast Construction Procedure for Arch Dams without Contraction Joints,” Guangdong Water Resources and Hydropower, 2002 (Supplement), pp. 8-9 (in Chinese).
  13. Wang, W. Q. and Huang, X. T., “Quality Control for Construction of a Double-Arch Dam of MgO Concrete,” Guangdong Water Resources and Hydropower, 2002 (Supplement), pp. 10-12 (in Chinese).
  14. Shen, S. L., Zhu, G. B., Huang, X. T., and Liu, J. H,, “Construction Procedure for Arch Dams of MgO Concrete without Contraction Joints,” Guangdong Water Resources and Hydropower, 2003, pp. 1-4 (in Chinese).
  15. Zhou, R. M., “Profit Analysis of Arch Dam Construction Using MgO Concrete,” Guangdong Water Resources and Hydropower, 2003, pp. 5-7 (in Chinese).
  16. Li, C. M., “Effects of Temperature on Autogenous Volume Expansion of MgO Concrete,” Design of Hydropower Stations, Vol. 15, No. 2, 1999, pp. 96-100 (in Chinese).
  17. Li, C. M., “Mechanical Properties and Durability of MgO Concrete,” Advanced in Science and Technology of Water Resources, Vol. 20, No. 5, 2000, pp. 30-35 (in Chinese).
  18. Chen, L. D., Xie, L. G., Li, H. Y., and Li, C. M., “Further Study of Mechanical Properties of MgO Concrete under Different Curing Temperatures,” Guangdong Water Resources and Hydropower, No. 2, 2003, pp. 11-13 (in Chinese).
  19. 김태상, 장봉석, 정상화, 김주형, “MgO를 혼합한 콘크리 트의 내구특성 평가에 관한 실험적 연구,” 한국콘크리트학회 가을 학술대회 논문집, 20권, 2호, 2008, pp. 397-400.
  20. 조택성, 채금화, “MgO 콘크리트의 댐축조 기술, 부록-수리수전공정 저온소성 MgO의 재료 품질 기술요구서,” 중국전력출판사, 2003, pp. 197-215 (in Chinese).
  21. 장봉석, 박한규, 강성균, 이광명, "MgO를 혼입한 모르타르의 길이 변화 특성," 2007 대한토목학회 정기학술대회 논문집, A권, 2007, pp. 408-411

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