This study is part of ongoing research in advancing construction practices by incorporating Ultra-High Performance Concrete (UHPC) with conventional Normal Concrete (NC) to enhance the structural efficiency, durability, and sustainability of the composite structures between UHPC and NC. The innovation lies in the unique collaboration between the remarkable mechanical properties of UHPC and the widespread availability of NC. The primary challenge addressed is the efficient bonding between these two materials. The research focuses on improving the shear-bond strength of concrete joints through direct shear testing, comparing the specimens with different interface treatments. Push-off tests were used in the experimental investigation of the shear-bond strength of the interface joints. Four different sets of joint configurations were included in the experimental program, with the key variables being the type of interface in different joints. Additionally, one monolithic NC specimen (without a joint) was set as a control specimen. The performance of each joint was studied including shear-bond strength, displacement response, and failure mechanism. The results show that the shear resistance of the interface between UHPC and NC portions is dominantly governed by the strength of NC section. This factor greatly contributes to the enhancement of the shear-bond strength between UHPC and NC. This bond strength could potentially be improved so that the composite UHPC-NC can be used as composite structural components efficiently.