Concrete waste (CW) recycling stands as a promising strategy to promote sustainable construction practices. This research aims to assess the feasibility of using recycled concrete aggregates (RCA) as a surrogate for natural aggregates (NA) in concrete applications and reduce the environmental impact associated with the depletion of natural resources and landfill space. To achieve these objectives, CW was segregated from debris mixes of construction and demolition waste (CDW), collected, crushed, and graded to generate RCA. Thirty-two concrete samples were prepared and categorized into four distinct groups with 0% (reference), 50%, 75%, and 100% substitution levels for both coarse RCA (CRCA) and fine RCA (FRCA), all utilized simultaneously. Concurrently, the environmental impacts of producing 1 m³ of concrete were evaluated using a life cycle assessment (LCA) approach, (cradle-to-gate) covering three phases, the raw material supply (A1), transportation (A2) and concrete production (A3). At the 50% replacement level, the mechanical properties of recycled aggregate concrete (RAC) demonstrated a 20.0% increase in splitting tensile strength, accompanied by marginal decrease in workability (15.0%) and compressive strength (6.0%). In addition, at that percentage, the average environmental effects were reduced by 31.3%, with specific reductions of 34.7% for A1, 40.3% for A2, and no change in A3.

Decentralized community recycling offers a sustainable pathway for managing 100% cement-based waste (CBW) from renovation activities, providing a viable alternative to centralized recycling facilities and landfilling. This study employs an integrated BIM-Life Cycle Assessment (LCA) framework to evaluate the use of recycled concrete aggregate as a substitute for natural aggregates in non-structural concrete. The CBW was dismantled, segregated, crushed, and graded to produce RCA. Thirty-six specimens were prepared in three mixes: CBW0 (100% NA), CBW1 (100% coarse RCA + 50% fine RCA, Styrene butadiene rubber/Water (SBR/W) = 1:25), and CBW2 (100% coarse RCA + 50% fine RCA, SBR/W = 1:50). A cradle-to-site LCA (A1-A4), following the EN 15,804 + A2 (adapted) baseline, quantified the environmental impacts of 1 m ³ of concrete. Relative to conventional concrete (CC), CBW2 achieved the target for grade 20 concrete, reaching 16 MPa after 28 days while reducing overall environmental impacts by 29%. Phase-specific savings reached 23.4% (A1-A3) and 75% (A4). These outcomes demonstrate the potential of decentralized recycling and BIM-LCA integration to balance mechanical performance with environmental efficiency in sustainable construction.