Abstract : Push-off tests are being used to experimentally investigate the shear performance of concrete construction joints as part of ongoing study to improve the bond between old-new concrete using reactive powder concrete and reinforcement. Using different types of interfacing, including use of water jet, dowel bars, grooved joint (triangle, rectangle, circle), In addition, cases without any construction joint were also considered as a reference. Shear strength, failure mechanisms, and load-displacement responses were studied as key parameters determining the shear performance of a single construction joint. Experimental results show that the grooved geometry greatly affect shear performance.