Bond stress–slip relationship between basalt fiber-reinforced polymer bars and concrete using a pull-out test

The basalt fiber-reinforced polymer bar is one of the newly evolved materials expected to be used as a structural reinforcement because of its non-corrosive nature and abundant tensile strength properties. The bond stress–slip relationship between fiber-reinforced polymer bars and concrete is necessary to evaluate the load carrying capacity of concrete components or structures reinforced with fiber-reinforced polymer bars. Although the relationship between fiber-reinforced polymer bars and concrete has been studied, the bond stress–slip relationship between concrete and basalt fiber-reinforced polymer bars considering the effect of bar diameter and concrete strength is still lacking. This paper presents an experimental investigation on the bond behavior between basalt fiber-reinforced polymer bars with different diameters (10, 14, and 20 mm) and concrete with two different compressive strengths using a pull-out test. The test results showed that (1) the failure mode between basalt fiber-reinforced polymer...