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環境影響評価のためのRCC橋梁のライフサイクルアセスメント：ケーススタディ

Life cycle assessment of RCC bridge for environmental impact evaluation: a case study (原題)

F. Arif, Areeba Khan, Asad-ur-Rehman Khan

Proceedings of the Institution of Civil Engineers : Engineering Sustainability📚 査読済 / ジャーナル2026-08-25#エネルギー転換経営インパクト: コスト削減対象セクター: construction
DOI: 10.1680/jensu.25.00219
原典: https://doi.org/10.1680/jensu.25.00219

🤖 gxceed AI 要約

日本語

本研究は、カラチの都市部にある鉄筋コンクリート橋を対象に、ISO 14040に準拠したLCAを実施し、ライフサイクル全体のCO2排出量を定量化した。建設・維持管理・運用段階を含む総排出量は約1,167万kg CO2-eqで、レディーミクストコンクリートと鉄筋が主要な排出源であることを明らかにした。低炭素材料の採用や効率的な設計の重要性を提言している。

English

This study conducts an LCA of an RCC bridge in urban Karachi following ISO 14040, quantifying total life-cycle CO2 emissions at about 11.68 million kg CO2-eq. Ready-mix concrete and reinforcement steel are the main emission sources. The paper recommends low-carbon materials and efficient design for sustainable infrastructure.

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

日本のインフラ老朽化対策やカーボンニュートラル政策において、橋梁等の社会資本のLCA評価は重要。本研究成果は、日本の建設業界における低炭素材料の選定や設計最適化の参考となる。

In the global GX context

This case study adds empirical evidence on bridge LCA, relevant to global infrastructure decarbonization efforts. It aligns with TCFD/ISSB expectations for disclosing embodied carbon in construction projects and supports sustainable infrastructure policies.

👥 読者別の含意

🔬研究者:Provides a detailed LCA case study for bridges, useful for benchmarking and methodological refinement.

🏢実務担当者:Highlights key emission sources in bridge construction, guiding material selection and design choices.

🏛政策担当者:Informs infrastructure procurement policies that prioritize low-carbon materials and lifecycle thinking.

📄 Abstract（原文）

Bridge construction activities significantly impact the environment due to the extensive use of materials and fuel-powered equipment, both contributing heavily to carbon dioxide (CO2) emissions. Life cycle assessment (LCA) provides a robust methodology for evaluating these environmental impacts throughout a bridge’s life span. This case study examines the environmental footprint of a reinforced cement concrete (RCC) bridge using a comprehensive LCA framework aligned with ISO 14040 standards and implemented through the One Click LCA tool. The selected case is an existing RCC bridge located in a densely populated urban area of Karachi, covering cradle-to-gate, operations, and maintenance phases. Construction phase data was gathered retrospectively, while maintenance impacts were estimated using scenario-based assessments supported by actual data from the contractor, consultant, and bridge authority. Operational emissions, including traffic-related carbon dioxide, were measured using carbon dioxide sensors and traffic counts. The total life cycle carbon footprint was calculated as 11 678 862.2 kg carbon dioxide-eq, with construction and maintenance phases contributing 11 676 493 kg carbon dioxide-eq, and fossil-based emissions alone accounting for 5 924 910 kg carbon dioxide-eq. Ready-mix concrete (26.4%) and reinforcement steel (24%) were the highest emission sources. The global warming potential category showed the greatest impact. The study emphasises adopting low-carbon materials, efficient design, and emission-reduction strategies for sustainable infrastructure.

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