Abstract: In reinforced concrete systems, ensuring that a good bond between the concrete and the embedded reinforcing steel is critical to long-term structural performance. Without good bond between the two, the system simply cannot behave as intended. The bond strength of reinforcing bars is a complex interaction between localized deformations, chemical adhesion, and other factors. For many years, the standard practice has been to coat reinforcing steel with an epoxy coating which provides a barrier between the steel and the corrosive elements of water, air, and chloride ions. Recently, there has been an industry led effort to use galvanizing to provide the protective barrier commonly provided by traditional epoxy coatings. However, as with any new structural product, questions exist regarding both the structural performance and corrosion resistance of the system. The work presented in this paper sought to understand the structural performance of galvanized reinforcing steel as compared to epoxy coated steel. This work consisted of a series of controlled laboratory tests. The results of this work indicate that there is no appreciable difference between the bond strength of epoxy coated reinforcing steel and galvanized reinforcing steel. Although some differences were observed, no notable difference in either peak load, slip, or failure mode could be identified.
Keywords: bond, bridges, concrete, epoxy, galvanized.
Title: Bond Strength and Development Length of Galvanized Reinforcing Steel
Author: Yoon-Si Lee, Brent Phares
International Journal of Civil and Structural Engineering Research
ISSN 2348-7607 (Online)
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