What is the difference in bonding performance to concrete between epoxy-coated bars and galvanized bars?

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Based on the findings of CEB Bulletin 211, the bonding of galvanized bars to concrete is lower in early age owing to hydrogen release when zinc reacts with calcium hydroxide in concrete and the presence of hydrogen tend to reduce the bond strength between galvanized bars and concrete. However, bonding will increase with time until the full bond strength of ungalvanized bars is attained.

For epoxy-coated bars, there is a 20% decrease in bond strength for bars placed at the bottom of concrete sections while for bars placed on the top there is no major difference in bond compared with uncoated bars.


This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.

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