This document reviews the behavior of concrete utilizing recycled aggregates, emphasizing the environmental benefits and properties of recycled materials. It discusses how recycled aggregates, derived from construction and demolition waste, can partially replace natural aggregates in concrete to minimize resource depletion while maintaining performance at specific replacement levels. The paper includes various studies on the mechanical and durability properties of recycled aggregate concrete and concludes that up to 30% recycled aggregate replacement can achieve similar strength to conventional concrete.