Expansive agents have been developed decades ago with further development and incorporation within various Portland cement concrete applications. In this study, calcium sulfo-aluminate (CSA) and aluminum powder were evaluated as expansive concrete agents. The experimental program involved testing of fresh and hardened concrete properties including slump, compressive, and splitting tensile strength. Furthermore, the potential of the expansive agents in repairing beams was assessed experimentally together with the degree of expansion achieved by each of the two studied agents. Finally, non-destructive tests were conducted in order to assess the degree of porosity of the mixtures containing expansive agents. The results reveal that the two expansive agents yield promising results in terms of effectively causing significant expansion as well as repairing concrete beams such as bridge girders which can indeed be useful in many transportation structures’ works.