Concrete is one of the most consumed and significant building material on the planet. By 2030, concrete production must be increased by 25%, and the world’s-built area will double in 40 years. The construction industry has become more aware of the environmental impact, energy consumption, and increase in CO2 intensity of the concrete that is used for construction, which can lead to sustainable development if the trend for the source of the material continues in the upcoming years. As a result, alternative raw materials are being sought by the concrete industry in particular. Reusing waste from the construction and demolition of infrastructure and buildings, which generate the most waste worldwide, is one option. The primary objective of this study was to investigate how the mechanical, microstructure, and durability properties of mortar are affected when Ground Recycled Cement (GRC) and Thermo-Activated Recycled Cement (TARC) are used as partial cement substitutes along with material characterizations. To this end, a variety of physical, chemical, mechanical, durability, and microstructure tests were conducted following extensive preliminary investigation of materials. From the microscopic morphology, particles in both GRC and TARC lack smoothness or sphericality in their morphology. Instead, they have irregular edges, rough edges, and a surface that is a little bit porous. On the surfaces of the GRC and TARC particles, crystal inclusions have also been observed. The use of GRC has a slight negative impact on the workability of mortar in comparison to other mix compositions. However, the other mix had a significant impact on the mortar's flow. In 20% replacement of TARC (T20) and Combined (GT20) mixes, the mortar's compressive strength, bulk density, and UPV have all been improved, particularly in the later age of mortars. Furthermore, the incorporation of GRC and TARC enhances the mortar's durability. The microstructure study reveals that 10% replacement of GRC (G10) mix has shoddier structural compactness and looseness than the control. However, the microstructure of the T20 and GT20 mixes was extremely dense. Keywords; Construction and Demolition Waste, Ground recycled Cement, Thermo-activated recycled cement, Recycled Concert, Mortar, Cement