Materials and Structures

, Volume 49, Issue 3, pp 1025–1037 | Cite as

An approach to improve conventional square ferrocement jacket for strengthening application of short square RC column

  • A. B. M. A. Kaish
  • M. Jamil
  • S. N. Raman
  • M. F. M. Zain
  • M. R. Alam
Original Article


The confinement effect over the cross-section of a square column is non-uniform compared to the same of a circular column. Concentration of stresses and subsequent cracking in the confining external jacket occurs at the corners of a square column; and thus the effectiveness of external jacket in such column is reduced significantly. The conventional square ferrocement jacket consists of rich mix cement mortar with single or multiple layers of wire mesh. This type of external jacket also experience similar problems in confining core columns. This study aims to develop efficient techniques to overcome the drawbacks of conventional square ferrocement jackets in strengthening of short square-shaped RC columns. Three techniques and variations in those techniques are proposed to address the problem. Experimental studies of selected variation from each technique affirm the effectiveness of the proposed techniques in addressing the problem associated with conventional square ferrocement jackets. The experimental investigation reveals that all the retrofitted square ferrocement-jacketed short columns exhibit higher load carrying and deflection capacities before failure compared with non-jacketed as well as conventional square ferrocement-jacketed columns. The findings indicated that the proposed techniques are efficacious to address the problem of conventional square ferrocement jacket.


Strengthening Ferrocement jacket Square RC column Stress concentrations Stress transfer 



The authors acknowledge the financial support provided by the Ministry of Higher Education of Malaysia through the ERGS grant scheme (ERGS/1/2011/TK/UKM/02/10). In addition, the first author would like to extend his gratitude to UKM for the financial support it provided through the Research University Zamalah Scholarship.


  1. 1.
    Benzaid R, Chikh NE, Mesbah H (2008) Behaviour of square concrete column confined with GFRP composite warp. J Civ Eng Manag 14(2):115–120CrossRefGoogle Scholar
  2. 2.
    Kondraivendhan B, Pradhan B (2009) Effect of ferrocement confinement on behavior of concrete. Constr Build Mater 23:1218–1222CrossRefGoogle Scholar
  3. 3.
    Kazemi MT, Morshed R (2005) Seismic shear strengthening of R/C columns with ferrocement jacket. Cem Concr Compos 27(4):834–842CrossRefGoogle Scholar
  4. 4.
    Kumar R, Rao CBK (2006) Constitutive behavior of high-performance ferrocement under axial compression. Mag Concr Res 58(10):647–656MathSciNetCrossRefGoogle Scholar
  5. 5.
    Tawab AA, Fahmy EH, Shaheen YB (2012) Use of permanent ferrocement forms for concrete beam construction. Mater Struct 45:1319–1329CrossRefGoogle Scholar
  6. 6.
    ACI 549.1R-93 (1993) Guide for design, construction and repair of ferrocement. ACI, MichiganGoogle Scholar
  7. 7.
    Rafeeqi SFA, Ayub T (2011) Investigation of versatility of theoretical prediction models for plain concrete confined with ferrocement. Asian J Civ Eng (Build House) 12(3):337–352Google Scholar
  8. 8.
    Kaish ABMA, Jamil M, Raman SN, Zain MFM (2014) Behaviour of ferrocement jacketed cylindrical concrete specimens under compression. In: Grantham M et al (eds) Concrete solutions. Taylor & Francis Group, London, pp 291–296Google Scholar
  9. 9.
    Mansur MA, Tan KL, Naaman AE (2010) Strength of bolted moment connections in ferrocement construction. Cem Concr Compos 32:532–543CrossRefGoogle Scholar
  10. 10.
    Xiong GJ, Wu XY, Li FF, Yan Z (2011) Load carrying capacity and ductility of circular concrete columns confined by ferrocement including steel bars. Constr Build Mater 25(5):2263–2268CrossRefGoogle Scholar
  11. 11.
    Mourad SM, Shannag MJ (2012) Repairing reinforced concrete rectangular columns using ferrocement laminates. In: Grantham M, Mechtcherine V, Schneck U (eds) Concrete solutions. Taylor & Francis Group, London, pp 757–763Google Scholar
  12. 12.
    Abdullah K Takiguchi (2003) An investigation into the behavior and strength of reinforced concrete columns strengthened with ferrocement jackets. Cem Concr Compos 25:233–242CrossRefGoogle Scholar
  13. 13.
    Tsai KC, Lin ML (2002a) Experimental axial load carrying performance of rectangular RC building columns retrofitted by steel or CFRP jacketing. Technical Report, National Centre for Research on Earthquake Engineering, National Taiwan University, TaiwanGoogle Scholar
  14. 14.
    Tsai KC, Lin ML (2002) Seismic jacketing of RC columns for enhanced axial load carrying performance. J Chin Inst Eng 25(4):389–402MathSciNetCrossRefGoogle Scholar
  15. 15.
    Tsai KC, Lin ML (2001) Steel jacket retrofitting of rectangular RC bridge columns to prevent lap-splice and shear failure. Technical report National Centre for Research on Earthquake Engineering, National Taiwan University, TaiwanGoogle Scholar
  16. 16.
    Park R, Paulay T (1975) Reinforced concrete structures. Wiley, New YorkCrossRefGoogle Scholar
  17. 17.
    Mander JB, Priestley MJN, Park R (1988) Theoretical stress–strain model for confined concrete. J Struct Eng ASCE 114(8):1804–1826CrossRefGoogle Scholar
  18. 18.
    Cusson D, Paultre P (1995) Stress–strain model for confined high-strength concrete. J Struct Eng ASCE 121(3):468–477CrossRefGoogle Scholar
  19. 19.
    Lam L, Teng G (2003) Design oriented stress–strain model for FRP confined concrete in rectangular columns. J Reinf Plast Compos 22(13):1149–1186CrossRefGoogle Scholar
  20. 20.
    Campione G, Miraglia N (2003) Strength and strain capacities of concrete compression members reinforced with FRP. Cem Concr Compos 25(1):31–41CrossRefGoogle Scholar
  21. 21.
    Youssef MN, Feng MQ, Mosallam AS (2007) Stress–strain model for concrete confined by FRP composites. Composites B 38:614–628CrossRefGoogle Scholar
  22. 22.
    Singh KK, Kaushik SK (1997) Behaviour of ferrocement composite columns in compression. In: ACI international conference on high performance concrete, design and materials and recent advances in concrete technology, Kuala LumpurGoogle Scholar
  23. 23.
    Mourad SM, Shannag MJ (2012) Repair and strengthening of reinforced concrete square columns using ferrocement jackets. Cem Concr Compos 34(2):288–294CrossRefGoogle Scholar
  24. 24.
    Kaish ABMA, Alam MR, Jamil M, Zain MFM, Wahed MA (2012) Improved ferrocement jacketing for restrengthening of square RC short column. Constr Build Mater 36(11):228–237CrossRefGoogle Scholar
  25. 25.
    Kaish ABMA, Alam MR, Jamil M, Wahed MA (2013) Ferrocement jacketing for restrengthening of square reinforced concrete column under concentric compressive load. Procedia Eng 54:720–728CrossRefGoogle Scholar
  26. 26.
    Shah AA (2011) Applications of ferrocement in strengthening of unreinforced masonry columns. Int J Geol 5(1):21–27Google Scholar
  27. 27.
    ACI 440.2R-08 (2008) Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures. American Concrete Institute, MichiganGoogle Scholar
  28. 28.
    Al-Salloum YA (2006) Influence of edge sharpness on the strength of square concrete columns confined with FRP composite laminates. Composites B 38:640–650CrossRefGoogle Scholar
  29. 29.
    Wang LM, Wu YF (2008) Effect of corner radius on the performance of CFRP-confined square concrete columns: test. Eng Struct 30(2):493–505CrossRefGoogle Scholar
  30. 30.
    Feng P, Lu XZ, Ye LP (2002) Experimental research and finite element analysis of square concrete columns confined by FRP sheets under uniaxial compression. In: Proceedings of 17th Australasian conference on the mechanics of structures and materials, Gold Coast, Australia, pp 71–76Google Scholar
  31. 31.
    Cao XM, Xiao JC, Huang ZH (2010) Experimental research on regional confined concrete columns under compression. In: Proceedings of challenges, opportunities and solutions in structural engineering and construction, London, pp 479–84Google Scholar
  32. 32.
    Hadi MNS (2007) Behaviour of FRP strengthened concrete columns under eccentric compression loading. Compos Struct 77:92–96CrossRefGoogle Scholar
  33. 33.
    Hadi MNS (2006) Behaviour of FRP wrapped normal strength concrete columns under eccentric loading. Compos Struct 72:503–511CrossRefGoogle Scholar
  34. 34.
    Hadi MNS (2007) The behaviour of FRP wrapped HSC columns under different eccentric loads. Compos Struct 78:560–566CrossRefGoogle Scholar
  35. 35.
    Mirmiran A, Shahawy M (1997) Behavior of concrete columns confined by fiber composites. J Struct Eng 123(5):583–590CrossRefGoogle Scholar

Copyright information

© RILEM 2015

Authors and Affiliations

  1. 1.Sustainable Construction Materials and Building Systems (SUCOMBS) Research Group, Faculty of Engineering & Built EnvironmentUniversiti Kebangsaan MalaysiaBangiMalaysia

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