Paper Key : IRJ************256
Author: Olaseni Oladehinde Iyiola
Date Published: 06 Apr 2025
Abstract
ABSTRACTThe transition to a circular economy (CE) in the construction sector necessitates a paradigm shift in how building engineering systems are designed, assessed, and managed throughout their lifecycle. Integrated Lifecycle Assessment (LCA) and carbon accounting are pivotal tools for quantifying environmental impacts, particularly greenhouse gas (GHG) emissions, across the entire lifespan of building systemsfrom material extraction, design, construction, and operation to end-of-life reuse or recycling. Traditional linear models of production and disposal are increasingly being replaced by CE principles that promote resource efficiency, material recovery, and closed-loop systems. This paper explores a holistic approach that combines LCA methodologies with dynamic carbon accounting to evaluate and optimize the environmental performance of building engineering systems under CE frameworks. It emphasizes the need for multi-criteria decision-making tools that consider embodied and operational carbon, material circularity, and system adaptability. The integration of digital technologies such as Building Information Modeling (BIM), Internet of Things (IoT), and Material Passports enables real-time data acquisition and better traceability of materials and emissions, improving the accuracy of assessments. Key challenges addressed include the inconsistency of data sources, temporal aspects of carbon storage and reuse, and the complexity of quantifying circularity in hybrid construction systems. By incorporating CE strategies such as modular design, component reuse, and life extension, this study highlights pathways to reduce life-cycle emissions while improving economic and functional performance. The research advocates for policy alignment, standardized metrics, and cross-disciplinary collaboration to drive systemic change. The proposed framework offers a robust foundation for sustainable building practices, carbon neutrality goals, and resilient infrastructure planning.Keywords: Circular Economy; Lifecycle Assessment; Carbon Accounting; Building Engineering Systems; Sustainable Construction; Embodied Carbon
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