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Tensile Stress-Crack Opening Relationship of Ultra High Performance Cementitious Composites(UHPCC) Used for Bridge Decks

바닥판 적용 초고성능 시멘트 복합체의 인장응력-균열개구 관계

  • Received : 2012.08.21
  • Accepted : 2012.10.22
  • Published : 2013.01.30

Abstract

Two different UHPCCs having different fiber lengths and volume fractions are considered to be applied to bridge decks. The objective of this study is to estimate cracking resistance of the two UHPCCs. The notched beam tests were performed with the UHPCCs, and the relationships between load and CMOD(Crack Mouth Opening Displacement) were obtained from the tests. The tensile stress and crack opening relationships optimally fitting the measured load-CMOD curves were found through the inverse analyses. The UHPCC with 2% volume fraction of 13 mm long fiber has lower fracture energy than the UHPCC with 0.5% and 1.0% volume fractions of 16.3 mm and 19.5 mm long fibers, respectively. It indicates that the latter UHPCC is more effective in uniformly distributing crack formation and reducing crack width.

실제 교량의 바닥판에 적용할 목적으로 섬유의 길이 및 혼입량을 달리한 두 가지 초고성능 시멘트 복합체를 고려하고 있다. 이 연구의 목적은 이 두 재료의 균열저항성을 평가하는 것이다. 두 재료에 대한 휨인장 파괴실험을 수행하였고, 실험으로부터 얻은 하중-균열개구변위 관계를 최적으로 모사하는 인장응력-균열개구 관계를 역해석을 통해 파악하였다. 역해석결과 13 mm 길이의 섬유를 2% 함유한 UHPCC는 16.3 mm와 19.5 mm 길이의 섬유를 각각 0.5%와 1.0% 함유한 UHPCC에 비해 파괴에너지가 작은 것으로 나타났다. 균열을 보다 분산시키고 균열폭을 감소시키기 위해서는 길이가 긴 두 종류의 섬유를 혼용한 UHPCC를 사용하는 것이 바람직할 것으로 판단된다.

Keywords

References

  1. Brown, K. M., "Derivative-Free Analogus of The Levenberg, Marquardt and Gauss Algorithms for Nonlinear Least Square Approximations", No. 320-2994, IBM, Philadelphia, 1970.
  2. Cha, S. W., Kim, K. H., Kim, S. W., Park, J. J., Bae, S. G., "Models for Hydration Heat Development and Mechanical Properties of Ultra High Performance Concrete", Journal of the Korea Concrete Institute, vol. 22, No. 3, 2010, pp.389-397. (In Korean) https://doi.org/10.4334/JKCI.2010.22.3.389
  3. Hwang, H. H., Yeo, I. S., Cho, K. H., Park, S. Y., "Evaluation of Flexural Strength for UHPC Deck Joints with Lap-Spliced Reinforced Steel Bar", Journal of the Korea Institute for Structural Maintenance and Inspection, vol. 15, No. 6, 2011, pp.92-99. (In Korean)
  4. Joh, C. B., Kim, B. S., Hwang, H. H., Choi, K. K., Choi, S. H., "Punching Shear Strength of Deck Slabs Made of Ultra High Performance Concrete", Journal of the Korea Institute for Structural Maintenance and Inspection, vol. 15, No. 4, 2011, pp.221-231. (In Korean) https://doi.org/10.11112/jksmi.2011.15.4.221
  5. Kang, S. T., Lee Y., Park, Y. D. and Kim, J. K. "Tensile fracture properties of an Ultra High Performance Fiber Reinforced Concrete (UHPFRC) with steel fiber", Composite Structures, vol. 92, No. 1, 2010, pp.61-71. https://doi.org/10.1016/j.compstruct.2009.06.012
  6. Kang, S. T., Park, J. J., Koh, G. T., Kim, S. W., "Evaluation on Flexural Capacity of Reinforced Concrete Beams with Ultra-High Performance Cementitious Composites", Journal of the Korea Institute for Structural Maintenance and Inspection, vol. 12, No. 5, 2008, pp.81-90. (In Korean)
  7. Kang, S. T., Park, J. J., Ryu, G. S., Kim, S. W., "Influence of the Filler's Particle Size on the Mechanical Properties of Ultra High Performance Concrete(UHPC)", KSCE Journal of Civil Engineering, vol. 28, No. 4A, 2008, pp.573-580. (In Korean)
  8. Kang, S. T., Park, J. J., Ryu, G. S., Kim, S. W., "The Effect of Steel-Fiber Reinforcement on the Compressive Strength of Ultra High Performance Cementitious Composites(UHPCC)", Journal of the Korea Institute for Structural Maintenance and Inspection, vol. 14, No, 5, 2010, pp.110-118. (In Korean)
  9. Kang, S. T., Ryu, G. S., "The Effect of Steel-Fiber Contents on the Compressive Stress-Strain Relation of Ultra High Performance Cementitious Composites (UHPCC)", Journal of the Korea Concrete Institute, vol. 23, No. 1, 2011, pp.67-75. (In Korean) https://doi.org/10.4334/JKCI.2011.23.1.067
  10. Kim, S. W., Choi, S., Lee, K. M., Park, J. J., "Autogeneous Shrinkage Characteristics of Ultra High Performance Concrete", Journal of the Korea Concrete Institute, vol. 23, No. 3, 2011, pp.295-301. (In Korean) https://doi.org/10.4334/JKCI.2011.23.3.295
  11. Kim, S. W., Kang, S. T., Han, S. M., "Characteristics and Application of Ultra High Performance Cementitious Composite", Magazine of Concrete Institute, vol. 18, No. 1, 2006, pp.16-21. (In Korean)
  12. Kim, Y. J., Chung, C. H., Kim, S. W., "Highway Bridge Decks - Past, Today and Future", Magazine of Concrete Institute, vol. 11, No. 3, 1999, pp.53-63. (In Korean)
  13. Kook, K. H., Shin, H. O., Kwahk, I. J., Yoon, Y. S., "Bond Characteristics of Ultra High Performance Concrete", Journal of the Korea Concrete Institute, vol. 22, No. 6, 2010, pp.753-760. (In Korean) https://doi.org/10.4334/JKCI.2010.22.6.753
  14. Kwon, S. H., Lee, S. G., Park, S. Y., Cho, K. H., Cho, J. R., Kim, S. T., "Analysis on Flexural Behavior of UHPC used for Bridge Deck : Part I. Stress-Crack Opening Relationship for Tensile Crack", KCI Spring Conference, Korea, vol. 24, No. 1, 2012, pp.249-250. (In Korean)
  15. Lee, C. D., Kim, W. J., Cho, K. S., Kim, J. H., "Design of UHPC(Ultra High Performance Concrete) Girder Cable Stayed Footbridge", Magazine of Concrete Institute, vol. 23, No. 5, 2011, pp.38-44. (In Korean)
  16. Lee, C. H., Chin, W. J., Choi, E. S., Kim, Y. J., "An Experimental Study on the joints in Ultra High performance Precast Concrete Segmental Bridges", Journal of the Korea Concrete Institute, vol. 23, No. 2, 2011, pp.235-244. (In Korean) https://doi.org/10.4334/JKCI.2011.23.2.235
  17. Lee, S. G., Kwon, S. H., Cho, K. H., Cho, J. R., Park, S. Y., Kim, S. T., "Experiments on Cracking Resistance of UHPC used for Bridge Deck", KCI Autumn Conference, Korea, vol. 23, No. 2, 2011, pp.141-142. (In Korean)
  18. Park, J. J., Ryu, G. S., Kang, S. T., Kim, S. W., "Comparison in the Performance of Laboratory High- Speed Mixer & Real-Size Mixer in the Manufacturing Ultra-High Performance Concrete", KSCE Conference, 2007, pp.2379-2382. (In Korean)
  19. Seonwoo, Y. H., Park, S. K., Kwahk, I. J., Yoon, Y. S., "Analysis on Bond Characteristics of Reinforcements for UHPC Hybrid Cable-Stayed Bridge Deck Joints", KSCE Journal of Civil Engineering, vol. 31, No. 3A, 2011, pp.207-214. (In Korean)
  20. Yang, I. H., Joh, C. B., Kim, B. S., "An Experimental Study on Flexural Behavior of Steel Fiber Reinforced Ultra High Performance Concrete Prestressed Girders", Journal of the Korea Concrete Institute, vol. 22, No. 6, 2010, pp.777-786. (In Korean) https://doi.org/10.4334/JKCI.2010.22.6.777
  21. Yoo, D. Y., Park, J. J., Kim, S. W., Yoon, Y. S., "Characteristics of Early-Age Restrained Shrinkage and Tensile Creep of Ultra-High Performance Cementitious Composites (UHPCC)", Journal of the Korea Concrete Institute, vol. 23, No. 5, 2011, pp.581-590. (In Korean) https://doi.org/10.4334/JKCI.2011.23.5.581
  22. Yoo, D. Y., Park, J. J., Kim, S. W., Yoon, Y. S., "Evaluating Early Age Shrinkage Behavior of Ultra High Performance Cementitious Composites (UHPCC) with CSA Expansive Admixture and Shrinkage Reducing Agent", Journal of the Korea Concrete Institute, vol. 23, No. 4, 2011, pp.441-448. (In Korean) https://doi.org/10.4334/JKCI.2011.23.4.441
  23. Zhao, Z., Kwon, S. H., and Shah, S. P., "Effect of Specimen Size on Fracture Energy and Softening Curve of Concrete: Part I. Experiments and Fracture Energy", Cement and Concrete Research, vol. 38, No. 8-9, 2008, pp.1049-1060. https://doi.org/10.1016/j.cemconres.2008.03.017