BOND STRENGTH BEHAVIOR OF HEADED REINFORCEMENT BAR WITH VARYING EMBEDMENT LENGTH

Abstract

Abstract: Headed reinforcement is a relatively new product and has not been used in many applications. Headed reinforcing bars have been extensively used in the construction of offshore oil platforms where hooked bars have traditionally been used to anchor longitudinal reinforcement or bars bent for ties and transverse reinforcement. Hooks and bent-bar ties create a large amount of congestion in the reinforcing cage which leads to difficulties during construction. Using headed reinforcement removes the tail extensions of hooks and allows fewer larger bars to be used, greatly reducing the congestion of the reinforcing cage. It has been found that the use of headed reinforcement can greatly decrease the time needed to erect the reinforcement resulting in large cost savings. Headed reinforcement has also been used in a few projects for strengthening and repairing footings of highway structures. A total 81 Pullout test were performed to the study of Bond behavior of Headed reinforcement bar in concrete with different Embedment length with various diameters of bars, various grade of concrete and various sizes of cubes. In this research project, it is proposed to execute experimental work by using headed reinforcement bars. The effect of different parameters like embedment length, head shapes and concrete grades, threaded headed reinforcement bars can be study. The results will be used to develop design recommendations for the application of headed reinforcement bars.