| 수록사항 |
한국대공간건축 논문집 , Vol. 26, No. 3 (통권 105호)(2026-09) |
| 주제어 |
; Recycled Aggregate; Concrete Structure; Life Cycle Assessment (LCA); CO₂ Emission; Carbon Neutrality |
| 요약2 |
This study evaluates the life cycle CO₂ emissions of concrete structures using recycled aggregates to support carbon neutrality in the construction industry. A life cycle assessment (LCA) was conducted on a 12-story reinforced concrete building in Seoul, encompassing stages from raw material extraction, transportation, concrete production, and construction, to a 40-year usage period (accounting for carbonation-induced CO₂ uptake), demolition, and waste processing. The assessment compared major structural members (columns, walls, beams, and slabs) based on two distinct environmental impact inventory categories: the 'Upper Level' (reflecting production process uncertainties) and the 'Lower Level' (assuming high-efficiency, optimized manufacturing processes). The results reveal a dual-faceted environmental impact of recycled aggregates. Under Upper Level conditions, the recycled aggregate concrete mixes increased life cycle CO₂ emissions by 25% to 34% compared to standard conventional concrete due to high material emission coefficients. Conversely, under Lower Level conditions, recycled aggregate concrete achieved comparable or reduced CO₂ emissions compared to conventional mixes. The findings demonstrate that to successfully implement low-carbon designs using recycled aggregate concrete, technical advancements must focus on controlling energy consumption during the aggregate production and refining processes to stabilize inventory data at the Lower Level. |
