This report summarizes the findings and results from an experimental study of vitreous enamel coating effects on the bond strength between deformed rebar and normal strength concrete. A total of 24 beam splice specimens were tested under four-point loading with four parameters investigated: bar size, lap splice length, coating, and confinement conditions. As the splice length increases, the ratio of bond strength between coated rebar and black rebar first increases from 1.0 to a maximum value of 1.44, and then decreases to 1.0. The maximum bond strength ratio corresponds to the near initial yielding of coated rebar. On the average, enamel coating can increase the bond strength of steel rebar in concrete by approximately 15%. A coating factor of 0.85 is thus recommended to take into account the enamel coating effect in lap splice designs, according to ACI and AASHTO bond strength equations.
G. Chen and C. B. Wu, "Splice Performance Evaluation of Enamel-Coated Rebar for Structural Safety," Mid-America Transportation Center, Jun 2014.
Civil, Architectural and Environmental Engineering
Research and Innovative Technology Administration (RITA)
Keywords and Phrases
Enamel Coating; Deformed Rebar; Bond Strength; Coating Factor
Report - Technical
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