<![CDATA[Reinforced concrete structural work requires substantial materials, energy, and transportation, which may generate environmental burdens throughout construction-related processes. This study identifies environmental hotspots in reinforced-concrete beam work and establishes mitigation priorities using Life Cycle Assessment (LCA). A case study was conducted on Project X in Magelang Regency by aggregating two beam groups into one beam-work system comprising 1,935.78 kg of reinforcing steel, 42.805 m² of formwork, and 4.290 m³ of ready-mix concrete. The functional unit was defined as 1 m³ of installed reinforced-concrete beam work, while the system boundary covered material production, transportation to the construction site, and construction activities. Modelling used SimaPro-derived inventory data and ecoinvent datasets with ReCiPe 2008 Midpoint (H) v1.13. The climate-change impact was approximately 5.62 × 10³ kg CO₂ eq, equivalent to about 1.31 × 10³ kg CO₂ eq/m³. Reinforcing steel was the principal hotspot, contributing approximately 69.6%, followed by cement at 21.5% and plywood at 4.3%. Sensitivity analyses of concrete composition, steel representation, formwork reuse, and transportation confirmed that reinforcing steel remained the dominant hotspot. Literature-based validation indicates that mitigation should prioritize reinforcement efficiency, fabrication-waste reduction, lower-impact steel procurement, cement efficiency, formwork reuse, and logistics optimization. ]]>
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