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Bond Strength of Epoxy-Coated Reinforcement to Concrete?An Update

by David Darwin, Univ of Kansas, United States,
Steven L. McCabe, Univ of Kansas, United States,
Hossain Hadje-Ghaffari, Univ of Kansas, United States,
Oan Chul Choi, Univ of Kansas, United States,



Document Type: Proceeding Paper

Part of: Serviceability and Durability of Construction Materials

Abstract:

The results of a large-scale study to determine the effect of epoxy coating on bond strength is described. The study addresses the effects of coating thickness, deformation pattern, bar size, concrete cover, bar position, and transverse reinforcement. The results indicate that bond strength decreases with increasing coating thickness only for No. 5 bars and smaller. The deformation pattern plays an important role in determining the effect of epoxy coating, and the reduction obtained due to epoxy coating increases with bar size. Concrete cover increases the bond strength of both uncoated and coated reinforcement. Transverse reinforcement significantly increases the bond strength of both uncoated and coated bars, and also appears to negate the reduction in bond strength caused by epoxy coating compared to uncoated bars without transverse reinforcement.

Subject Headings: Reinforced concrete | Bars (structure) | Coating | Synthetic materials | Epoxy | Bonding | Strength of materials

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