Abstract
Abstract Reusing structural concrete has gained attention as a strategy for reducing greenhouse gas emissions and resource consumption in the construction industry. However, knowledge gaps remain regarding the practical feasibility and environmental benefits of high-value reuse, particularly for reinforced cast-in-place concrete elements. This study advances knowledge by analyzing a Norwegian case study on the reuse of cast-in-place concrete floor slabs, utilizing detailed empirical inventory data documented by contractors. The results demonstrate that while the base reuse scenario (R_S1) showed higher Global Warming Potential (GWP) impacts than low-carbon concrete alternatives, optimized deconstruction strategies offer significant benefits. By refining the shoring method and material allocation (R_S3) and (R_S4), GWP impacts were reduced by up to 78%, aligning with previous theoretical studies. Crucially, the environmental benefits depend highly on the volume and allocation of materials used for temporary shoring during deconstruction. These findings underscore the critical importance of developing efficient deconstruction methods and standardized allocation approaches to maximize the environmental potential of structural concrete reuse. Future research should address the logistical and economic challenges to facilitate broader adoption in the construction industry.