Development and Strength Characteristics of Recycled Aggregate Concrete Derived from Partial Replacement of Construction and Demolition Waste
摘要
Globally, concrete remains the most used construction product in all kinds of projects related to civil engineering, largely because good raw aggregates are hard to come. Consequently, recycled aggregates made from waste from construction and demolition are being utilized in concrete more and more. Crushed concrete rubble as a substitution to natural coarse aggregates into concrete after it has been segregated from construction and demolition waste and sieved. For the current investigation, materials that follow were incorporated to make recycled aggregate concrete (RAC): OPC 53 grade, water, sulphonated naphthalene formaldehyde-based super plasticizer, natural and recycled coarse aggregate (NCA, RCA), natural and recycled fine aggregate (NFA, RFA) with 10 to 35%. For controlled concrete, cement is the main binder complies with the M30 mix design is implemented to mix OPC, NFA, NCA, and water to make conventional concrete mix. Combine OPC, RCA, RFA water, and the super plasticizer to make RAC mix. The optimum percentage of recycled aggregate to incorporate into concrete represents 30%, based on the concrete’s strength and workability. The recycled aggregate concrete’s workability was a bit less than that of conventional concrete. The physical qualities of recycled fine and coarse aggregate are slightly greater than those required by the standards. But when natural aggregates are used in place of both recycled aggregates up to a 30% level, the desired strength is achieved. Therefore, it seems like recycling demolition waste represents a feasible choice.