Cumulative Intervention Area and Reconfiguration Carbon Intensity: A Comparative LCA of Hybrid Dry Floor Systems in High-Churn Office Buildings

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🔬研究者:Provides novel indicators for use-phase embodied carbon and demonstrates their diagnostic value over mass-based metrics.

🏢実務担当者:Offers a feasible strategy for reducing embodied carbon in high-churn office buildings through partial dry construction, aiding sustainability reporting.

🏛政策担当者:Highlights the importance of use-phase interventions in building decarbonization policies and the need for metrics beyond initial construction.

Office buildings accumulate embodied carbon not only during construction but repeatedly throughout operation, driven by tenant improvements (TI). In contexts where regulatory and supply-chain constraints limit full design-for-disassembly, this paper explores partial decoupling of a dry slab system within the high-churn zone of a Seoul office. Two area-normalised indicators are introduced—cumulative intervention area (Acum) and Reconfiguration Carbon Intensity (RCI)—defined on the structural slab/panel boundary to complement the mass-weighted Circularity Index (CI). The indicators are demonstrated on a 17-storey Seoul office over 60 years across three scenarios: a wet composite baseline (S1), full-dry CLT (S2), and a hybrid placing CLT within the high-churn zone (S3). S3 reduces RCI by approximately 45% relative to the wet baseline, capturing 71.7% of the full-decoupling benefit while converting only 11.5% of the floor area to CLT—a benefit-to-conversion ratio of 6.2×. Both shares are fixed by the floor-plate geometry, so this ratio is a consequence of the high-churn zone’s concentration rather than an independent empirical finding. A joint-uncertainty stress test confirms that S3 outcomes lie entirely below S1 across plausible parameter ranges. A placement test compares three configurations of the same floor that differ only in CLT placement location relative to the high-churn zone. Mass-weighted CI cannot distinguish these configurations, whereas RCI ranges from no reduction to the full hybrid benefit depending on placement—isolating the diagnostic value of the use-phase indicator. Hybrid zone-scale decoupling offers a feasible pathway for use-phase decarbonisation without committing to full-floor dry construction.

• semanticscholar https://www.mdpi.com/2075-5309/16/15/2990/pdf?version=1785161146first seen 2026-07-31 06:55:26 · last seen 2026-08-02 06:25:51