An Experimental Investigation on the Improving the Bond Behavior of Glass Fiber Reinforced Polymer Bars in Concrete

Nibras Khalid; Muhaned Shallal; Hanadi Naji; Alaa Hasson

doi:10.30572/2018/KJE/160205

Authors

Nibras Khalid Department of Civil Engineering, Mustansiriyah University, Baghdad, Iraq https://orcid.org/0000-0003-4661-7914
Muhaned Shallal Department of Civil Engineering, University of AlQadisiyah, Diwaniyah, Iraq
Hanadi Naji Department of Civil Engineering, Mustansiriyah University, Baghdad, Iraq
Alaa Hasson Department of Civil Engineering, University of AlQadisiyah, Diwaniyah, Iraq

DOI:

https://doi.org/10.30572/2018/KJE/160205

Keywords:

Bond behavior, GFRP, Steel fibers, Bond-slip curves, Surface coating

Abstract

The bond is considered one of the factors that plays an important role in the behavior of the reinforced concrete structural elements. In recent years, using the glass fiber reinforced polymer (GFRP) as an alternative to steel bars is needed to verify its performance in the structures. In this study, the bond between the concrete and GFRP bars is investigated through using two different surface enhancement techniques (sand and steel fibers). Fourteen beam specimens were cast and tested considering three different parameters, concrete compressive strength (55 and 78 MPa), bar diameter size (6mm and 10 mm) and the surface scheme (non-coated, sand-coated and steel fiber-coated). The experimental work included the recording of the bond stress and corresponding slip. For a certain value of concrete grade and 6 mm bar diameter, the bond behavior improved by 206% and 198% for the sand-coated surface and steel fiber-coated bars as compared to non-coated bars, respectively. For the same bar size (6mm), the best enhancement in bond strength was found by (61%) for the non-coated surface when the concrete compressive strength increased from 55 to 78 MPa. The use of larger bar diameter for the same concrete compressive strength, the higher bond strength improvement was 55% for the non-coated surface bar. From the bond stress-slip curves, the tests indicate that when the surface of the GFRP bars is coated by sand, it will give the best enhancement in the bond strength.

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References

Arezoumandi, M., Steele, A. R. and Volz, J. S.(2018) 'Evaluation of the bond strengths between concrete and reinforcement as a function of recycled concrete aggregate replacement level', Structures, 16, 73–81. https://doi.org/10.1016/j.istruc.2018.08.012 DOI: https://doi.org/10.1016/j.istruc.2018.08.012

Benmokrane,B., Tighiouart,B. and Chaallal,O.(1996) 'Bond strength and load distribution of composite gfrp reinforcing bars in concrete', ACI Materials Journal , 93(3), 246–253. DOI: https://doi.org/10.14359/9810

CEB Bulletin 151, (1982) 'Bond Action and Bond Behaviour of Reinforcement', State of- the-Art Report. CEB, Comit´e Euro International du B´eton. Par´ıs.

De Almeida Filho, F.M., El Debs, M.K. and El Debs, A.L.H.C. (2008) 'Bond-Slip Behavior of Self-Compacting Concrete and Vibrated Concrete Using Pull-out and Beam Tests', Mater. Struct. Constr. 41, 1073–1089. DOI: https://doi.org/10.1617/s11527-007-9307-0

Desnerck, P., De Schutter G. and Taerwe, L. (2010) 'Bond behavior of reinforcing bars in self-compacting concrete: Experimental determination by using beam tests', Materials and Structures ,43(1), 53–62. DOI: https://doi.org/10.1617/s11527-010-9596-6

Gao, K., Li, Z., Zhang, J., Tu, J. and Li, X. (2019) 'Experimental Research on Bond Behavior between GFRP Bars and Stirrups-Confined Concrete', Appl. Sci. ,9, 1340. https://doi.org/10.3390/app9071340 DOI: https://doi.org/10.3390/app9071340

Hasoon, A., Khalid N. and Shallal, M. (2023) 'Bond‑behavior improvement of carbon fiber reinforced polymer bars: an experimental study', Asian Journal of Civil Engineering, 24, 179–188. https://doi.org/10.1007/s42107-022-00496-y DOI: https://doi.org/10.1007/s42107-022-00496-y

Ipek, S., Ayodele, O. A. and Mermerdaş, K. (2020) 'Influence of artificial aggregate on mechanical, properties, fracture parameters and bond strength of concretes', Construction and Building Materials, 238 ,117756. https://doi.org/10.1016/j.conbuildmat.2019.117756 DOI: https://doi.org/10.1016/j.conbuildmat.2019.117756

Kanakubo, T., Yonemaru, K., Fukuyama,H., Fujisawa, M., and Sonobe, Y.,(1993) 'Bond performance of concrete members reinforced with FRP bars', ACI Special Publications, vol. 138, pp. 767-767.

Khaksefidi,S. , Ghalehnovi ,M. and de Brito, J.,(2021) 'Bond Behaviour of High-Strength Steel Rebars in Normal (NSC) and Ultra-High Performance Concrete (UHPC) ', J. Build. Eng. 33, 101592. https://doi.org/10.1016/j.jobe.2020.101592 DOI: https://doi.org/10.1016/j.jobe.2020.101592

Larralde , J. and Silva-Rodriguez, R. (1993) 'Bond and slip of FRP rebars in concrete', Journal of Materials in Civil Engineering, 5, 30-40. DOI: https://doi.org/10.1061/(ASCE)0899-1561(1993)5:1(30)

Law, D. W. , Tang,D. , Molyneaux,T. K. C. and Gravina, R. (2011) 'Impact of crack width on bond: Confined and unconfined rebar', Materials and Structures/Materiaux et Constructions, 44 (7), 1287–1296. https://doi.org/10.1617/s11527-010-9700-y DOI: https://doi.org/10.1617/s11527-010-9700-y

Ma , G. , Huang, Y., Aslani, F. and Kim,T.(2019) 'Tensile and bonding behaviours of hybridized BFRP–steel bars as concrete reinforcement', Constr. Build. Mater., 201, 62–71. https://doi.org/10.1016/j.conbuildmat.2018.12.196 DOI: https://doi.org/10.1016/j.conbuildmat.2018.12.196

Majain, N., Ahmad, A.B., Adnan, A. and Mohamed, R.N. (2022) 'Bond Behaviour of Deformed Steel Bars in Steel Fibre High-Strength Self-Compacting Concrete', Construction and Building Materials, 318, 125906. https://doi.org/10.1016/j.conbuildmat.2021.125906 DOI: https://doi.org/10.1016/j.conbuildmat.2021.125906

Makitani, E ., Irisawa, I. and Nishiura, N.(1993) 'Investigation of bond in concrete member with fibre reinforced polymer bars', in Proceedings of the International Symposium Fibre-Reinforced-Plastic Reinforcement for Concrete Structures, ACI SP-138, 315–331.

Osifala, K.B., Salau ,M.A. and Obiyomi, T.H. (2017) 'Effect of Waste Steel Shavings on Bond Strength between Concrete and Steel Reinforcement', IOP Conf. Ser. Mater. Sci. Eng. 251, 012080. https://doi:10.1088/1757-899X/251/1/012080 DOI: https://doi.org/10.1088/1757-899X/251/1/012080

Pop,I., De Schutter, G., Desnerck P. and Szilagy, H. (2015) 'Influence of Self-Compacting Concrete Fresh Properties on Bond to Reinforcement', Mater. Struct. Constr. 48, 1875–1886. https://doi.org/10.1617/s11527-014-0280-0 DOI: https://doi.org/10.1617/s11527-014-0280-0

Prince ,M. J. R. and Singh, B. (2013) 'Bond behaviour between recycled aggregate concrete and deformed steel bars', Materials and Structures, 47 (3), 503–516. DOI: https://doi.org/10.1617/s11527-013-0075-8

Qi ,J., Cheng,Z. John Ma, Z. ,Wang J. and Liu, J. (2021) 'Bond Strength of Reinforcing Bars in Ultra-High Performance Concrete: Experimental Study and Fiber–Matrix Discrete Model', Eng. Struct. 248, 113290. https://doi.org/10.1016/j.engstruct.2021.113290 DOI: https://doi.org/10.1016/j.engstruct.2021.113290

Shukur, S.A. and Alkhudery, H.H. (2023) 'Experimental Assessment of The Mechanical Properties of Steel-Fiber Composite Bar (SFCB) Reinforcement', Kufa Journal of Engineering, 14(1), 50-66. https://doi.org/10.30572/2018/KJE/140104 DOI: https://doi.org/10.30572/2018/KJE/140104

Trabacchin, G. , Sebastian,W. and Zhang, M. Z. (2022) 'Experimental and analytical study of bond between basalt FRP bars and geopolymer concrete', Construction and Building Materials, 315, 125461. https://doi.org/10.1016/j.conbuildmat.2021.125461 DOI: https://doi.org/10.1016/j.conbuildmat.2021.125461

Zhao, W. (1999) 'Crack and deformation behaviour of FRP reinforced concrete structures', PhD. Thesis, University of Sheffield.