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

Korea Institute for Structural Maintenance Inspection (한국구조물진단유지관리공학회)
권호 표지

Prediction Model on Autogenous Shrinkage of High Performance Concrete

고성능 콘크리트의 자기수축 예측모델에 관한 연구

  • Received : 2005.06.30
  • Published : 2006.05.30
Download PDF
⟨ Previous Next ⟩

Abstract

The autogenous shrinkage of high-performance concrete is important in that it can lead the early cracks in concrete structures. The purpose of the present study is to explore the autogenous shrinkage of high-performance concrete with admixture and to derive a realistic equation to estimate the autogenous shrinkage model of that. For this purpose, comprehensive experimental program has been set up to observe the autogenous shrinkage for various test series. Major test variables were the type and contents of admixture and water-cement ratio is fixed with 30%. The autogenous shrinkage of HPC with fly ash slightly decreased than that of OPC concrete, but the use of blast furnace slag increased the autogenous shrinkage. Also, the autogenous shrinkage of HPC is found to decrease with increasing shrinkage reduction agent and expansive additive. A prediction equation to estimate the autogenous shrinkage of HPC with admixture was derived and proposed in this study. The proposed equation show reasonably good correlation with test data on autogenous shrinkage of HPC with mineral and chemical admixture.

고성능 콘크리트의 자기수축은 초기균열을 유도할 수 있기 때문에 내구성 측면에서 매우 중요하다. 이에 따라, 본 연구에서는 실험을 통해 혼화재료를 혼입한 고성능 콘크리트의 자기수축 특성을 분석한 후 예측모델을 제안하였다. 이를 위해 다양한 실험변수를 가진 시편에 대해 광범위한 실험을 수행하였다. 주요 실험변수는 혼화재료의 종류 및 혼입률로 설정하였으며 물-시멘트비는 30%로 고정하였다. 실험결과 플라이애시를 치환한 경우에는 자기수축량이 다소 감소하였으며, 고로슬래그를 사용한 경우에는 자기수축이 증가하였다. 또한, 수축저감제 및 팽창재의 혼입량이 클수록 고성능 콘크리트의 자기수축은 감소하는 경향을 보였다. 한편, 본 논문에서는 회귀분석을 통해 혼화재료를 사용한 고성능 콘크리트의 자기수축 예측식을 제안하였으며, 제안된 자기수축 예측식은 실험결과와 비교적 일치하였다

Keywords

References

  1. 고경택, 박정준, 이종석, 김성욱, "광물질 혼화재를 사용한 고성능 콘크리트의 수축특성", 대한토목학회 논문집, Vol. 23, No. 6A, 2003, pp.1133-1141.
  2. 自己收縮硏究委員, コンクリ-トの自己收縮硏究委員會報告書, 日本コンクリ-ト工學協會, 2002.
  3. CEB-FIP 2000, Structural Concrete : Textbook on Behavior, Design and Performance, Vol. 1, Sprint- Druck Stuttgart, 1999, pp.43-46.
  4. Jonasson, J. and Hedlund, H., "An Engineering Model for Creep and Shrinkage in High Performance Concrete," Proceedings of International RILEM Workshop on Shrinkage of Concrete, Shrinkage 2000, Edited by Baroghel-Bouny, V. and Aitcin, P. C., Paris, France, 2000.
  5. Miyazawa, S. and Tazawa, E., "Prediction Model for Shrinkage of Concrete Including Autogenous Shrinkage, Creep, Shrinkage and Durability Mechanics of Concrete and Other Quasi-Brittle Materials," Proceedings of Sixth International Conference, Elsevier Science Ltd,. 2001, pp735-746.
  6. Neville, A. M., Properties of Concrete, Addison Wesley Longman Limited, London, 1995, pp.425- 438.
  7. RILEM TC 119-TCE, "Avoidance of Theral Cracking in Concrete at Early Age Recommendations", Materials and Structures, Vol. 30, No. 202, 1997, pp.451-464. https://doi.org/10.1007/BF02524773