Green materials in the context of cement and concrete refer to environmentally friendly materials that are either derived from sustainable sources or contribute to sustainability through their lifecycle performance. These materials, including recycled aggregates, fly ash, slag from steel production, and natural pozzolans, are used to replace or supplement traditional cement and aggregates. The adoption of green materials in concrete production not only reduces the environmental impact associated with the extraction and processing of virgin materials but also enhances the eco-efficiency and lifecycle durability of concrete structures. In settings with severe environmental conditions, such materials can offer improved performance in terms of durability, reduced permeability, and enhanced resistance to chemical attacks, contributing significantly to the sustainability and resilience of built environments.