This review examines the impact of parent concrete (PC) strength on the properties of recycled concrete aggregates (RCAs) and recycled aggregate concrete (RAC). The study highlights that the strength of PC significantly influences the physical, mechanical, long-term, and microstructural properties of RCAs and RACs, including water absorption, specific gravity, compressive strength, elastic modulus, splitting tensile strength, flexural strength, durability, and microstructure. The quality of RCAs is primarily affected by the porosity of the source concrete and the crushing procedure used to process the aggregates. Studies show that RACs produced from high-strength PC (not less than 80 MPa) can have equivalent or better characteristics than conventional natural aggregate concrete. However, there are conflicting findings in the literature regarding the relationship between PC strength and RCA/RAC properties, which may be due to variations in methodologies and experimental conditions. The review identifies that the quality of RCAs is influenced by the type and number of crushers used, as well as the source concrete strength. The study concludes that the mechanical and long-term properties of RCAs and RACs are affected by the quality of the parent concrete. The review also emphasizes the need for further research to better understand the relationship between PC strength and RCA/RAC properties, as well as to develop more effective methods for recycling construction and demolition waste. The findings suggest that using high-strength PC can lead to the production of high-performance RAC without the need for additional natural aggregates. The review provides a comprehensive analysis of the existing literature on the effects of PC strength on RCA and RAC properties, highlighting the importance of considering PC quality in the production of RAC. The study also discusses the impact of PC strength on the physical and mechanical properties of RAC, including workability, compressive strength, split tensile strength, flexural strength, and elastic modulus. The review concludes that the strength of PC has a significant impact on the properties of RAC, and that further research is needed to fully understand this relationship.This review examines the impact of parent concrete (PC) strength on the properties of recycled concrete aggregates (RCAs) and recycled aggregate concrete (RAC). The study highlights that the strength of PC significantly influences the physical, mechanical, long-term, and microstructural properties of RCAs and RACs, including water absorption, specific gravity, compressive strength, elastic modulus, splitting tensile strength, flexural strength, durability, and microstructure. The quality of RCAs is primarily affected by the porosity of the source concrete and the crushing procedure used to process the aggregates. Studies show that RACs produced from high-strength PC (not less than 80 MPa) can have equivalent or better characteristics than conventional natural aggregate concrete. However, there are conflicting findings in the literature regarding the relationship between PC strength and RCA/RAC properties, which may be due to variations in methodologies and experimental conditions. The review identifies that the quality of RCAs is influenced by the type and number of crushers used, as well as the source concrete strength. The study concludes that the mechanical and long-term properties of RCAs and RACs are affected by the quality of the parent concrete. The review also emphasizes the need for further research to better understand the relationship between PC strength and RCA/RAC properties, as well as to develop more effective methods for recycling construction and demolition waste. The findings suggest that using high-strength PC can lead to the production of high-performance RAC without the need for additional natural aggregates. The review provides a comprehensive analysis of the existing literature on the effects of PC strength on RCA and RAC properties, highlighting the importance of considering PC quality in the production of RAC. The study also discusses the impact of PC strength on the physical and mechanical properties of RAC, including workability, compressive strength, split tensile strength, flexural strength, and elastic modulus. The review concludes that the strength of PC has a significant impact on the properties of RAC, and that further research is needed to fully understand this relationship.