Bond strength between concrete and steel rebar in circular sections

The object of research. This research seeks to gain a deeper understanding of the mechanisms of force transmission between concrete and steel rebars in circular sections and to provide practical solutions to improve the performance of the structures. The bond strength between concrete and rebar in circular sections has been extensively studied due to its significance in the design and evaluation of reinforced concrete buildings. Compared to other building types, concrete structures are used notably more often, to the extent that most countries in the world are using more concrete than steel. Due to the significance of steel-concrete adhesion and how it affects the behavior of reinforced concrete elements, a thorough investigation into all the factors influencing this adhesion and how they relate to one another is required. In reinforced concrete constructions, steel-concrete adhesion is very crucial and is influenced by the concrete mixing strategy as well as the shape and positioning of the steel. Method. The out-pull test is one of several tests used to determine the adherence between concrete and steel. This study used the pull-out test with three tests to examine the effects of the length of the rebar buried in concrete, the amount of concrete coating on the rebar, and the 28-day compressive strength of concrete on the adhesion between concrete and steel. Results. With the increase in the length of the reinforcement inside the concrete sample, no noticeable changes are observed in the average maximum adhesion stress. According to several experimental studies on the bond strength of concrete and rebar in circular sections, the average maximum adhesion stress rises with the concrete sample's diameter. Additionally, the average maximum adhesive stress rises with an increase in the 28-day compressive strength.

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