Epoxy-coated rebar is a crucial material in marine construction. To study the bond performance of epoxy-coated rebar with high-strength concrete in different structural forms, pull-out tests were conducted on 18 specimens. The failure patterns and bond-slip behavior of different epoxy-coated rebar-high strength concrete specimens were analyzed. Based on these tests, finite element analysis software Abaqus was used to conduct a parametric analysis by varying the rebar diameter and bond length, investigating the ultimate bond strength of components under different parameters. The results indicate that due to the relatively low compressive strength of the concrete, specimens exhibited rebar pull-out failure, concrete splitting failure, and rebar fracture failure during the pull-out tests. As the rebar diameter increased, the anchoring capacity of the epoxy-coated rebar improved. Specifically, for every 1 mm increase in diameter, the ultimate bond load increased by 16.9% to 23.9%. Additionally, increasing the bond length of the rebar enhanced the ultimate bond strength of the specimens, with the ultimate bond load increasing by 13.2% to 24.2% for every 1d increase in length. The conclusions drawn from this research provide technical support for the engineering application of epoxy-coated rebar in high-strength concrete.

Keywords: Epoxy-coated rebar, Pull-out test, Finite element analysis, Parametric analysis, Ultimate bond strength.