Unlocking circularity in construction: a cradle-to-cradle assessment of prefabrication vs conventional methods of construction
建設における循環性の解放：プレハブ工法と従来工法のクレードル・トゥ・クレードル評価 (AI 翻訳)
Harshal Tikam, Chirag Kothari
🤖 gxceed AI 要約
日本語
プレハブ鉄骨構造（PSS）と鉄筋コンクリート（RCC）および組積造（LB）を、クレードル・トゥ・クレードルの枠組みで比較。システム境界を拡張し、終末期の循環性を考慮することで、性能評価が変わることを実証。PSS・RCCは中高層、LBは低層に適する。
English
This study compares prefabricated steel structures (PSS) with reinforced concrete (RCC) and load-bearing masonry (LB) using a cradle-to-cradle framework. It finds that extending system boundaries to include end-of-life circularity changes relative performance rankings: LB is most preferred for low-rise, while PSS and RCC suit mid/high-rise buildings. Emphasizes incorporating closed-loop material flows in sustainability assessment.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
日本では建設分野の脱炭素化が急務であり、本論文のクレードル・トゥ・クレードル評価は、サーキュラーエコノミーとLCAの統合を促進する点で示唆に富む。SSBJやグリーンボンド評価への適用可能性も考えられる。
In the global GX context
In the global push for circular economy in construction, this study provides a robust comparative LCA/LCCA framework that explicitly accounts for end-of-life scenarios. It underscores the need to move beyond operational carbon to embodied and end-of-life impacts—a key message for ISSB/TCFD-aligned building disclosures.
👥 読者別の含意
🔬研究者:Novel cradle-to-cradle comparison of construction methods; methodology for incorporating circularity into LCA.
🏢実務担当者:Helps construction firms and developers choose between prefab and conventional systems considering full lifecycle costs and environmental impacts.
🏛政策担当者:Informs building regulations and circular economy policies that incentivize end-of-life material recovery over disposal.
📄 Abstract（原文）
The study aims to advance building-level sustainability assessment by employing a cradle-to-cradle framework incorporating closed-loop material flows. It evaluates the environmental and economic performance of prefabricated steel structures (PSS) compared to reinforced cement concrete (RCC) and load-bearing (LB) masonry structures, using extended system boundaries, thereby addressing the literature gap regarding the limited exploration of cradle-to-cradle assessment. Additionally, the study develops a comprehensive understanding of critical lifecycle phases, including end-of-life considerations, for informed decision-making. The study employs an evaluation matrix comprising life cycle assessment (LCA) and life cycle cost analysis (LCCA), supported by inventory analysis, to quantify and compare resource usage, environmental impacts and life cycle costs of selected construction methods within a cradle-to-cradle system boundary. The assessment is structural-system-dominant, excluding identical non-structural and MEP elements. Uncertainty and sensitivity analyses are further incorporated to assess the influence of input parameter uncertainty, end-of-life allocation methods, degree of prefabrication and expected service life on overall performance. Results showed extending the system boundary from cradle-to-operation to cradle-to-cradle altered the relative performance ranking of construction methods, highlighting the need to explicitly account for complete end-of-life stages and circularity potential to enable accurate sustainability assessment. For the case studies, LB emerged as the most preferred option (suitable for low-rise structures), followed by PSS and RCC (suitable for mid/high-rise building typologies). The study presents a novel cradle-to-cradle, building-level assessment of PSS in comparison to RCC and LB masonry structures. It underscores the importance of incorporating closed-loop material flows and end-of-life processes in evaluation for accurate and comprehensive assessment of environmental and economic performance. It further reveals environmental and financial implications of selected construction methods across life-cycle stages, aiding sustainability-oriented decision-making.
🔗 Provenance — このレコードを発見したソース
- semanticscholar https://doi.org/10.1108/sasbe-09-2025-0529first seen 2026-06-29 06:50:48
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