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Mechanics of Composite Materials

, Volume 48, Issue 5, pp 587–602 | Cite as

RC Slabs Repaired and Strengthened by Alumina/Polymer Mortar and Prestressing Strands in the Tension Zone: Experimental Investigation Under Static and Fatigue Loadings

  • K. B. Han
  • S. N. Hong
  • S. K. Park
Article

While the extent of repair and rehabilitation of existing old concrete structures is rapidly increasing, a vast number of repaired and rehabilitated structures do not function properly during their remaining service life. Especially in the case of using heterogeneous repair materials, it is very important to maintain the bonding performance between materials and to prevent the interface failure under static and fatigue loads. This paper focuses on the experimental investigation of reinforced concrete (RC) slabs, repaired and reinforced with an alumina/polymer (AP) mortar and a prestressing (PS) strand in the tension zone, under static and fatigue loadings. The variables in this experimental study were the space of strengthening, the number of strands, and AP mortar thickness. Attention is concentrated on the overall load-carrying capacity, deflection, strains of reinforcing bars, and the efficiency of repaired and reinforced RC slabs. Test results showed that the deflection of the repaired and reinforced RC slabs was approximately 40% lower than that of control RC slabs. The initial and horizontal cracking loads of a RC slab with an AP mortar of thickness 30 mm in the static test were approximately the same as those of a RC slab with a 20-mm-thick one. In the fatigue test, the deflection, the strain of reinforcing bars at the midspan, and the maximum shear stress of the repaired and strengthened RC slab were about 40~70% lower than those of the control RC slab. Therefore, it can be concluded that RC slabs with an AP mortar and PS strands have a good strengthening efficiency under both static and fatigue loadings, thanks to the high bonding capacity of the AP mortar.

Keywords

repaired and strengthened RC slab AP mortar PS strand static and fatigue load bonding capacity 

Notes

Acknowledgement

This work was supported by the Postdoctoral Research Program of Sungkyunkwan University (2011).

References

  1. 1.
    M. A. Shahawy, T. Beitelman, M. Arockiasamy, and R. Sowrirajan, “Experimental investigation of the structural repair and strengthening of damaged prestressed concrete slabs by utilizing externally bonded carbon laminates,” Composites: Part B, 27B, 217-224, (1996).CrossRefGoogle Scholar
  2. 2.
    L. Bisby, M. Green, and V. Kodur, “Modeling the behavior of fiber-reinforced polymer-confined concrete columns exposed to fire,” J. Compos. Constr., ASCE, 9, No.1, 15–24, (2005).CrossRefGoogle Scholar
  3. 3.
    G. Zanardo, H. Hao, Y. Xia, and A. Deeks, “Condition assessment through modal analysis of a run-on RC slab bridge before and after strengthening,” J. of Bridge Engineering, ASCE, (2006).Google Scholar
  4. 4.
    B. Bonfiglioli and G. Pascale, “Dynamic assessment of reinforced concrete beams repaired with externally bonded FRP sheets,” Mech. Compos. Mater., 42, No. 1, 1-12, (2006).CrossRefGoogle Scholar
  5. 5.
    K. B. Han, J. M. Park, and S. K. Park, “Full-scale pseudo-dynamic test for bridge retrofitted with seismic isolations,” The Baltic Journal of Road and Bridge Engineering, 3, No. 1, 38–46, (2008).CrossRefGoogle Scholar
  6. 6.
    G. Monti and N. Nistico, “Square and rectangular concrete columns confined by CFRP experimental and numerical investigation,” Mech. Compos. Mater., 44, No. 3, 289-308, (2008).CrossRefGoogle Scholar
  7. 7.
    S. H. Kim, K. B. Han, K. S. Kim, and S. K. Park, “Stress–strain and deflection relationships of RC beam bonded with FRPs under sustained load,” Composites: Part B, 40, 292-304, (2009).CrossRefGoogle Scholar
  8. 8.
    B. Krour, A. Tounsi, S. Benyoucef, and E. A. Adda Bedia, “An improved closed-form solution to interfacial stresses in RC beams strengthened with a composite plate,” Mech. Compos. Mater., 46, No. 3, 331-340, (2010).CrossRefGoogle Scholar
  9. 9.
    A. Ohta, T. Sugiyama, and T. Uomoto, “Study of dispersing effects of polycarboxylate-based dispersant on fine particles,” American Concrete Institute Special Publication SP-195, 211-227, (2000).Google Scholar
  10. 10.
    N. Toyoharu, “Effect of chemical structure on the steric stabilization of polycarboxylate-based superplasticizer,” Journal of Advanced Concrete Technology, 4, No. 2, 225-232, (2006).CrossRefGoogle Scholar
  11. 11.
    M. C. S. Ribeiro, A. J. M. Ferreira, and A. T. Marques, “Effect of natural and artificial weathering on the long-term flexural performance of polymer mortars,” Mech. Compos. Mater., 45, No. 5, 515-526, (2009).CrossRefGoogle Scholar
  12. 12.
    A. E. Mohammed, M. S. Hamed, M. F. Ahmed, and H. E. Ashraf, “Use of slurry infiltrated fiber concrete in reinforced concrete corner connections subjected to opening moments,” J. of Advanced Concrete Technology, 7, No. 1, 51-59, (2009).CrossRefGoogle Scholar
  13. 13.
    L. Czarnecki, A. Garbacz, and J. Kurach, ”On the characterization of polymer concrete fracture surface,” Cement and Concrete Composites, 23, 399–409, (2001).CrossRefGoogle Scholar
  14. 14.
    M. M. Al-Zahrani, M. Maslehuddin, S. U. Al-Dulaijan, and M. Ibrahim, “Mechanical properties and durability characteristics of polymer- and cement-based repair materials,” Cement and Concrete Composites, 25, 527–537, (2003).CrossRefGoogle Scholar
  15. 15.
    P. S. Rao and G. Mathew, “Behavior of externally prestressed concrete beams with multiple deviators,” Structural Journal, ACI, 93, No. 4, 7–8, (1996).Google Scholar
  16. 16.
    K. B. Han and S. K. Park, “Parametric study of truss bridges by the posttensioning method,” Canadian Journal of Civil Engineering, 32, 420–429, (2005).CrossRefGoogle Scholar
  17. 17.
    M. Koichi, F. Naoyuki, and S. Masoud, “Path-dependent high-cycle fatigue modeling of joint interfaces in structural concrete,” Journal of Advanced Concrete Technology, 6, No. 1, 227-242, (2008).CrossRefGoogle Scholar
  18. 18.
    H. R. Lotfi and P. B. Shing, “Interface model applied to the fracture of masonry structures,” Journal of Structural Engineering, 120, No. 1, 63-80, (1994).CrossRefGoogle Scholar
  19. 19.
    P. J. Heffernan, M. Erki, and D. L. DuQuesnay, “Stress redistribution in cyclically loaded reinforced concrete beams,” Journal of the American Concrete Institute, Structural, 101, No. 2, 261-268, (2004).Google Scholar
  20. 20.
    K. Yamada, H. Shima, and K. Haraguchi, “Effects of cyclic loading and time on the bond between a steel bar and concrete,” Proceeding of Japan Concrete Institute, 13, No. 2, 133-138, (1991).Google Scholar
  21. 21.
    Y. Taira, K. Suda, K. Aikawa, and T. Noguchi, “Cyclic fatigue loading experiment of connection joints in between pre-cast panels,” Transaction of Japan Society of Civil Engineers, 5, (2007).Google Scholar
  22. 22.
    H. S. Shen, Y. Chen, and W. L. Su, “Bending and vibration characteristics of damaged RC slabs strengthened with externally bonded CFRP sheets,” Composite Structures, 63, 231–242, (2004).CrossRefGoogle Scholar
  23. 23.
    S. P. Singh and S. K. Kaushik, “Fatigue strength of steel fibre-reinforced concrete in flexure,” Cement and Concrete Composites, 25, 779–786, (2003).CrossRefGoogle Scholar
  24. 24.
    S. Siengchin, “Processing, structure, and mechanical properties of alumina-nanofilled polystyrene composites,” Mech. Compos. Mater., 46, No. 4, 443-450, (2010).CrossRefGoogle Scholar
  25. 25.
    ACI 440.3R-04, Guide Test Methods for Fiber-Reinforced Polymers (FRPs) for Reinforcing or Strengthening Concrete Structures, 20-22, (2004)Google Scholar

Copyright information

© Springer Science+Business Media New York 2012

Authors and Affiliations

  1. 1.Super Long Span Bridge R&D Center, Expressway and Transportation Research InstituteKorean Expressway CorporationGyeonggi-doRepublic of Korea
  2. 2.Department of Civil and Environmental EngineeringSungkyunkwan UniversitySuwonRepublic of Korea

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