Computers and Concrete

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Bonding between high strength rebar and reactive powder concrete

  • Deng, Zong-Cai (The Key Laboratory of Urban Security and Disaster Engineering, Ministry of Education, Beijing University of Technology) ;
  • Jumbe, R. Daud (The Key Laboratory of Urban Security and Disaster Engineering, Ministry of Education, Beijing University of Technology) ;
  • Yuan, Chang-Xing (The Key Laboratory of Urban Security and Disaster Engineering, Ministry of Education, Beijing University of Technology)
  • Received : 2013.04.30
  • Accepted : 2013.11.21
  • Published : 2014.03.28
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Abstract

A central pullout test was conducted to investigate the bonding properties between high strength rebar and reactive powder concrete (RPC), which covered ultimate pullout load, ultimate bonding stress, free end initial slip, free end slip at peak load, and load-slip curve characteristics. The effects of varying rebar buried length, thickness of protective layer and diameter of rebars on the bonding properties were studied, and how to determine the minimum thickness of protective layer and critical anchorage length was suggested according the test results. The results prove that: 1) Ultimate pull out load and free end initial slip load increases with increase in buried length, while ultimate bonding stress and slip corresponding to the peak load reduces. When buried length is increased from 3d to 4d(d is the diameter of rebar), after peak load, the load-slip curve descending segment declines faster, but later the load rises again exceeding the first peak load. When buried length reaches 5d, rebar pull fracture occurs. 2) As thickness of protective layer increases, the ultimate pull out load, ultimate bond stress, free end initial slip load and the slip corresponding to the peak load increase, and the descending section of the curve becomes gentle. The recommended minimum thickness of protective layer for plate type members should be the greater value between d and 10 mm, and for beams or columns the greater value between d and 15 mm. 3) Increasing the diameter of HRB500 rebars leads to a gentle slope in the descending segment of the pullout curve. 4) The bonding properties between high strength steel HRB500 and RPC is very good. The suggested buried length for test determining bonding strength between high strength rebars and RPC is 4d and a formula to calculate the critical anchorage length is established. The relationships between ultimate bonding stress and thickness of protective layer or the buried length was obtained.

Keywords

References

  1. Roux, N, Andrade, C. and San Juan, M. (1996), "Experimental study of durability of reactive powder concretes", J Mat. Civil Eng ASCE, 8(1), 1-6. https://doi.org/10.1061/(ASCE)0899-1561(1996)8:1(1)
  2. Liu, J., Song, S. and Wang, L. (2009), "Durability and micro-structure of reactive powder concrete", J Wuhan Univ Technol. (Materials Science Edition), 24(3), 506-509. https://doi.org/10.1007/s11595-009-3506-1
  3. Saleem, M., Mirmiran, A., Xia, J. and Mac kie, K. (2012), "Development length of high-strength steel rebar's in ultra-high performance concrete", J Mat. Civil Eng., 129(6), 725-732.
  4. Harajli, M.H. (2004), "Comparison of bond strength of steel bars in normal and high strength concrete", J. Mat. Civil Eng., 16(4), 365-374. https://doi.org/10.1061/(ASCE)0899-1561(2004)16:4(365)
  5. Mahesh, M. (2012), "Bond strength of reactive powder concrete containing steel fiber and silica fume", IJETAE., 2(10), 2250-2459.
  6. Toree-Cassanova, A., Jason, L., Davenne, L and Pinelli, X. (2013), "Confinement effect on the steel concrete bond strength and pull out failure", Eng. Frac. Mech., 97, 92-104. https://doi.org/10.1016/j.engfracmech.2012.10.013
  7. Yeih, W., Huang, R., Chang, J. and Yang, C. (1997), "A pullout test for determining interface properties between rebar and concrete", Adv Cem Based Mat., 5, 57-65. https://doi.org/10.1016/S1065-7355(96)00004-1
  8. Victor, Y.G., Lawrence, F.K. and Kimberly, E.K. (2009), "Short-term tensile creep and shrinkage of ultrahigh performance concrete", Cement Concrete Compos., 31, 147-152. https://doi.org/10.1016/j.cemconcomp.2009.01.002
  9. Mingji, A. and Zhang, M. (2007), "Experimental research of bond capability between deformed bars and reactive powder concrete," China Railway Sci., 28(2), 50-54 (in Chinese).
  10. Mahesh, K.M. and Chetan, D.M. (2010), "A comparative study of reactive powder concrete containing steel fibers and recron 3S fibers", J. Eng. Res. Stud., 1(1), 83-89.
  11. Richard, A.B. and Geofrey, C.M. (2001), "The transfer of stress through a steel to concrete adhesive bond", Int. J. Adhes Adhes., 21(6), 495-502. https://doi.org/10.1016/S0143-7496(01)00031-8
  12. GB 50010-2010 code for design of concrete structures, China Architecture & Building Press (in Chinese).

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