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道路トンネル建設のカーボンフットプリントとエネルギー使用：系統的LCAレビューとポーランドのケーススタディ

Carbon Footprint and Energy Use of Road Tunnel Construction: A Systematic LCA Review and Case Study of Poland (原題)

Samson Femi Adesope, Klaudia Zwolińska-Glądys, Marek Borowski

Sustainability📚 査読済 / ジャーナル2026-08-24#エネルギー転換Origin: EU経営インパクト: コスト削減対象セクター: construction
DOI: 10.3390/su18178675
原典: https://doi.org/10.3390/su18178675

🤖 gxceed AI 要約

日本語

道路トンネルの建設は材料やエネルギー集約的で炭素排出が多いが、排出ホットスポットや工法比較、地域差の知見が不足している。本論文はPRISMAに基づく系統的レビューとポーランドのケーススタディLCAを組み合わせ、材料生産が建設段階排出の70-95%を占め、コンクリートと鉄鋼が主要因であることを示した。低炭素コンクリートやプレハブ化、再生可能エネルギーで排出を40-60%削減可能と提案する。

English

Road tunnel construction is carbon-intensive, yet emission hotspots and regional differences are understudied. This paper combines a PRISMA-based systematic review with a Polish case-study LCA, finding material production accounts for 70-95% of construction-phase emissions, with concrete and steel dominating. It proposes low-carbon concrete, prefabrication, and renewable energy to cut emissions by 40-60%.

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

日本のインフラ建設では、トンネル工事の脱炭素が急務であり、本論文のLCA手法や材料代替の知見は、国土交通省のインフラ脱炭素化施策や建設業界のカーボンニュートラル対応に示唆を与える。特に、コンクリートや鉄鋼の代替材料の評価は、日本の建設資材調達や環境配慮設計に応用可能。

In the global GX context

Globally, infrastructure decarbonization is critical for meeting climate targets. This study provides a systematic LCA framework and empirical data from Poland, contributing to the growing body of knowledge on reducing embodied carbon in construction. Its findings on material substitution and operational efficiency are relevant for global infrastructure projects and align with ISSB and CSRD disclosure requirements for construction firms.

👥 読者別の含意

🔬研究者:Provides a comprehensive LCA review and case study that can inform future research on tunnel decarbonization and regional emission factors.

🏢実務担当者:Offers actionable insights for construction companies to reduce carbon footprint through material choices and operational improvements.

🏛政策担当者:Highlights policy levers for promoting low-carbon construction materials and energy-efficient infrastructure.

📄 Abstract（原文）

Road tunnels are highly carbon-intensive due to material use, energy-intensive construction, and long service lives, yet major gaps remain regarding emission hotspots, construction method comparisons, and regional differences, particularly in Central and Eastern Europe. This article combines a PRISMA 2020-guided systematic literature synthesis with a Polish case-study life-cycle assessment (ISO 14040/14044, cradle to grave, functional unit of 1 m of tunnel, 100-year horizon) using Ecoinvent factors and the Polish energy mix, covering material production, construction, operation, maintenance, and end of life. The literature synthesis found substantial variability in tunnel carbon emissions, ranging from 1500 to 22,062 t CO2-eq per lane-kilometer depending on the construction method, tunnel type, and region. Material production was the largest contributor to construction-phase emissions (70–95%), with concrete and steel responsible for over 90% of material-phase impacts and 75–80% of construction-phase emissions, while operational energy use dominates over the full life cycle. Concrete and steel substitution (e.g., GFRP bars and calcium sulfoaluminate cement) offers the greatest construction-phase reduction potential, while operational measures, such as LED lighting, demand-controlled ventilation, and renewable energy, can cut long-term energy use by 30–50%. For Poland, low-carbon concrete, prefabrication, and renewable electricity could reduce tunnel emissions by 40–60%. These findings highlight pathways for decarbonizing tunnel infrastructure through material innovation, energy-efficient operation, and circular economy principles.

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