International Research Journal of Education and Technology

By minimizing waste and lowering dependency on natural aggregates, recycled concrete aggregate (RCA) promotes sustainable building practices. However, because of the residual mortar that is affixed to the aggregate particles, RCA usually has disadvantages such as increased porosity, increased water absorption, and decreased compressive strength. These characteristics have a detrimental effect on the strength and durability of RCA- based concrete. In order to overcome these drawbacks and improve the structural properties of RCA concrete, this study investigates a pre-coating treatment technique. The suggested technique involves precoating RCA with substances like polymer-based solutions, cement slurry, or silica fume. These coatings work to improve interfacial transition zones in concrete by filling surface pores and fortifying the bond between RCA and the new cement matrix. This effectively lowers water absorption. By using this method, the treated RCA shows improved physical characteristics, which raises the concrete mix's compressive strength. According to experimental analysis, pre-coated RCA concrete outperforms untreated RCA concrete in terms of compressive strength. According to the results, pre- coating recycled aggregate concrete (RCA) improves its overall performance and lessens its inherent flaws, making it a good substitute for structural applications. By encouraging the efficient use of recycled materials without sacrificing quality, this technique advances sustainable building practices.

Key Words: Recycled Concrete Aggregate, Pre- coating Treatment, Compressive Strength, Water Absorption, Sustainable Concrete.