Adhesion of Class A500C Steel Reinforcement to Concrete of Various Strengths

Abstract

New experimental data on the bond forces (bond stresses) between sickle-shaped ribbed steel reinforcement of class A500C and normal-weight concrete of various strength classes have been obtained. Pull-out tests of 16 mm diameter steel bars embedded in concrete prisms 5d (80 mm) high were conducted using a hydraulic tensile testing machine. An improved calculation methodology is proposed to ensure a reliable bond between A500C steel reinforcement and normal-weight concrete of varying strength levels. It was established that an increase in concrete strength leads to a proportional increase in the bond capacity of sickle-shaped reinforcement. A linear relationship between the maximum tangential bond stresses and concrete strength was identified, demonstrating good agreement with the experimental results. The proposed linear dependence can be applied in the design of reinforced concrete structures for calculating the ultimate bond strength between sickle-shaped steel reinforcement and normal-weight concrete of various strength classes.