Bond Strength of Fusion Bonded Epoxy-Coated Reinforcement in Concrete

G M Sadiqul Islam(1*), Ehsan Ahmed(2), Md. Sabbir Hossain(3), S. M. Sharif Uddin(4)

(1) Department of Civil Engineering, Chittagong University of Engineering & Technology, Chattogram, BANGLADESH
(2) Department of Architectural & Engineering Technology, Thompson Rivers University, Kamloops, BC, CANADA
(3) Department of Civil Engineering, Chittagong University of Engineering & Technology, Chattogram, BANGLADESH
(4) Department of Civil Engineering, Chittagong University of Engineering & Technology, Chattogram, BANGLADESH
(*) Corresponding Author


Fusion-bonded epoxy-coated steel is expected to extend the service life of the reinforced concrete structure in chloride-laden environments. However, the effect of coating on the bond-strength between rebar and concrete is not well understood yet. This research, therefore, studied the effect of epoxy-coating on the bond characteristics of reinforcing bars in concrete. The bond characteristics were assessed through pullout test considering variables viz. concrete strength, embedded length and bar diameter. The load was applied to reinforcing bars embedded in concrete until bond strength between the bar and concrete exceeded. Bond strength of epoxy-coated bars was compared with that of the uncoated bars. It was found that epoxy-coating reduced the bond strength approximately 25% for Ø20mm bar and 12% for Ø16mm and Ø12mm bar. As with uncoated bar, bond strength of coated bars were also increased with concrete strength. However, the bond strength ratio between coated and uncoated bars was found almost independent of concrete strength. Based on the test results, a development length modification factor of 1.33 is proposed for Ø20mm bar and 1.15 for Ø12mm and Ø16mm bar to compensate the bond strength reduction due to the epoxy coating.


Fusion-Bonded Epoxy-Coat; Steel Corrosion; Embedded Length; Bond Strength; Pullout

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Assaad, J. J. and Issa, C. A. (2012) ‘Bond strength of epoxy-coated bars in underwater concrete’, Construction and Building Materials, 30, pp. 667–674. doi: 10.1016/j.conbuildmat.2011.12.047.

ASTM A775 (2017) ‘Standard specification for epoxy-coated reinforcing steel bars’, ASTM International, West Conshohocken, USA.

ASTM A934/A934M-04 (2016b) ‘Standard specification for epoxy-coated reinforcing steel bars’, Valsper 720A009 Greenbar, USA.

ASTM A994 (2016a) ‘Standard test method for comparing bond strength of steel reinforcement bars to concrete using beam-end specimens’, ASTM International, West Conshohocken, USA.

Bazant, Z. P. and Sener, S. (1988) ‘SIZE EFFECT IN PULLOUT TESTS.’, ACI Materials Journal, 85(2), pp. 347–351.

Berke, N. S. and Hicks, M. C. (1995) ‘Calcium nitrite corrosion inhibitor with and without epoxy-coated reinforcing bar for long term durability in the gulf’, in. Bahrain: Proceedings of the Concrete Durability in the Arabian Gulf Conference, pp. 119–132.

Breen, J. E. (2012) ‘Techniques for Improving Durability of Post-Tensioned Concrete Bridges’, Arabian Journal for Science and Engineering, 37(2), pp. 303–314. doi: 10.1007/s13369-012-0184-7.

Choi, O. C. et al. (1991) ‘Bond of epoxy-coated reinforcement: bar parameters’, ACI Materials Journal, 88(2), pp. 207–217.

Cleary, D. B. and Ramirez, J. A. (1991) ‘Bond strength of epoxy-coated reinforcement’, ACI Structural Journal, 88(2), pp. 146–149.

Clifton, J. R. and Mathey, R. G. (1983) ‘Bond And Creep Characteristics Of Coated Reinforcing Bars In Concrete.’, Journal of the American Concrete Institute, 80(4), pp. 288–293.

El-Hakeem, F. A., Abd El-Aziz, M. I. and El-Reedi, M. A. (1997) ‘Calculating bond strength of coated and uncoated steel bars using an analytical model’, in. Kuwait: Proceedings of the Seventh Arab Structural Engineering Conference, pp. 247–256.

El-Hawary, M. M. (1999) ‘Evaluation of bond strength of epoxy-coated bars in concrete exposed to marine environment’, Construction and Building Materials, 13(7), pp. 357–362. doi: 10.1016/S0950-0618(99)00042-2.

Islam, A. and Naha, A. (2015) Evaluation of bond strength of epoxy coating steel in concrete. Chittagong University of Engineering & Technology, Bangladesh.

Kayali, O. and Yeomans, S. R. (2000) ‘Bond of ribbed galvanized reinforcing steel in concrete’, Cement and Concrete Composites, 22(6), pp. 459–467. doi: 10.1016/S0958-9465(00)00049-4.

Kazakov, K. and Yanakieva, A. (2009) ‘Finite element method numerical simulation and ductile capacity analysis of bond-slip between epoxy coated plain steel bars and concrete’, in WIT Transactions on Engineering Sciences. doi: 10.2495/SECM090201.

Miller, G. G., Kepler, J. L. and Darwin, D. (2003) ‘Effect of epoxy coating thickness on bond strength of reinforcing bars’, ACI Structural Journal, 100(3), pp. 314–320.

Mišković-stanković, V. B., Dražić, D. M. and Teodorović, M. J. (1995) ‘Electrolyte penetration through epoxy coatings electrodeposited on steel’, Corrosion Science, 37(2), pp. 241–252. doi: 10.1016/0010-938X(94)00130-X.

Treece, R. A. and Jirsa, J. O. (1989) ‘Bond strength of epoxy-coated reinforcing bars’, ACI Materials Journal, 86(2), pp. 167–174.


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