Demand for repair mortar is quite high in the Asian market owing to the deteriorating concrete structures. Hence, this study endeavors to examine the applicability of limestone calcined clay cement (LC3) as a repair material for concrete that involves reinforcement. For this LC3, ordinary Portland cement (OPC) and Pozzolanic Portland Cement (PPC) repair mortars were developed. The effect of admixture dosage on strength development of different blends was studied, which shows admixture dosage plays a significant role in strength gain for repair mortar, especially in case of LC3. Besides strength, repair mortar must exhibit compatibility and bond with substrate concrete. Hence, in this study bonding behavior between existing substrate concrete and repair mortar was compared using slant shear and split tensile tests. It has been observed that LC3 repair mortar creates a good bond with existing OPC and PPC substrates. In addition, transport properties tests performed on the repair mortars exhibited that LC3 will be best in hindering the ingress of moisture and oxygen which are essential to cause corrosion in reinforced concrete structures.