Revolutionizing Concrete: A Review of Sustainable Innovations with Recycled Materials and Advanced Additives

Cement continues to be the most used construction material globally, but its manufacture contributes substantially to the environment, mainly due to a high carbon footprint and resource depletion. Sustainable innovations in concrete are highlighted through the use of recycled materials and innovative additives, which aim to improve performance and minimize ecological footprint. Recycled materials like Fly Ash (FA), Ground Granulated Blast Furnace Slag (GGBS), Recycled Aggregates (RAs), and by-products of industries are discussed in the replacement of conventional ingredients. In contrast, nano-scale additives like nano-silica, graphene oxide, and carbon nanotubes are discussed for their role in enhancing mechanical and durability characteristics. The review utilizes the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) approach to systematically examine research conducted between the years 2020 and 2025 from databases such as Scopus, basing the comparison of the variables like Compressive Strength (CS), Tensile Strength (TS), Durability, and environmental performance. Some of the studies have claimed the improvement of the strength by up to 25%. At the same time, issues like the difficulty of workability, the cost implication, and long-term performance uncertainty persist. The study concludes by stating that the sustainable development of concrete involves the enhancement of material combinations and the adoption of innovative methodologies to satisfy the twin targets of the performance of the material and environmental sustainability. The conclusion indicates that the use of supplementary cementitious resources and nano-additives minimizes the permeability, improves the strength, and increases the service life of concrete.