International Journal of Concrete Structures and Materials

  • 제18권3E호
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  • Pages.207-211
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  • 2006
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  • 1976-0485(pISSN)
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  • 2234-1315(eISSN)
한국콘크리트학회 (Korea Concrete Institute)
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Repair Performance of Engineered Cementitious Composites(ECC) Treated with Wet-Mix Spraying Process

  • Kim, Yun-Yong (Department of Civil Engineering Chungnam National University)
  • 발행 : 2006.12.31
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초록

This paper presents an experimental study on the repair performance of sprayed engineered cementitious composites(ECC) serving as a repair material. Sprayable ECC, which exhibit tensile strain-hardening behavior in the hardened state and maintain sprayable properties in the fresh state, have been developed by using a parallel control of micromechanical design and rheological process design. The effectiveness of sprayable ECC in providing durable repaired structures was assessed by spraying the ECC and testing them for the assessment. The experimental results revealed that, when sprayed ECC were used as a repair material, both load carrying capacity and ductility represented by the deformation capacity at peak load of the repaired flexural beams were obviously increased compared to those of commercial prepackaged mortar(PM) repaired beams. The significant enhancement in the energy absorption capacity and tight crack width control of the ECC repair system treated with wet-mix spraying process suggests that sprayed ECC can be effective in extending the service life of rehabilitated infrastructures.

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참고문헌

  1. Li, V. C., 'Advances in ECC Research,' ACI Special Publication on Concrete: Material Science to Applications, SP 206-23, 2002, pp.373~400
  2. Li, V. C., 'Reflections on the Research and Development of Engineered Cementitious Composites (ECC),' Proceedings of the JCI International Workshop on Ductile Fiber Reinforced Cementitious Composites (DFRCC)-Application and Evaluation (DRFCC-2002), Takayama, Japan, 2002, pp.1~21
  3. Lim, Y. M., M. K. Kim, J. H. J. Kim., and S. K. Shin, 'Is Ductility Important for Repair Applications,' Proceedings of the JCI International Workshop on Ductile Fiber Reinforced Cementitious Composites (DFRCC)-Application and Evaluation (DRFCC- 2002), Takayama, Japan, 2002, pp.199~208
  4. Zhang, J. and V.C. Li, 'Monotonic and Fatigue Performance of Engineered Fiber Reinforced Cementitious Composite in Overlay System with Deflection Cracks,' J. of Cement and Concrete Research, Vol.32, No.3, 2002, pp.415~423 https://doi.org/10.1016/S0008-8846(01)00695-0
  5. Kim, Y. Y., Kong, H. J., and Li, V. C., 'Design of Engineered Cementitious Composite Suitable for Wet-mixture Shotcreting', ACI Materials Journal, Vol.100, No.6, 2003, pp.511~518
  6. Melbye, T.A. and Holmgren, J. (2001), 'Modern Advances and Applications of Sprayed Concrete,' in 'Shotcrete: Engineering Developments' 2001, 7-29, Proceedings of an International Conference on Engineering Developments in Shotcrete, Hobart/Tasmana, 2001, pp.59~81.
  7. Melbye, T. A. and Holmgren, J. (2001), 'Modem Advances and Applications of Sprayed Concrete,' in 'Shotcrete: Engineering Developments', Proceedings of an International Conference on Engineering Developments in Shotcrete, Hobart/Tasmana, 2001, pp.59-81