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BIM-integrated life cycle assessment of decentralized cement-based waste recycling in renovation projects
Ammar Younes1, Emad Elbeltagi2, Ahmad Ehab3
1Construction and Building Engineering Department, Faculty of Engineering, Arab Academy for Science, Technology and Maritime Transport (AASTMT), Aswan, 81511, Egypt.
Abstract:
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 m3 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.
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