Embodied Carbon in Ghanaian Low-Volume Road Infrastructure: A PRISMA-Guided Systematic Review and First-Pass A1–A3 Scenario Modelling Study
ガーナの低容量道路インフラにおけるエンボディドカーボン：PRISMAに基づく系統的レビューと初期的なA1～A3シナリオモデリング研究 (AI 翻訳)
Obiri Gyadu-Asiedu, Simon Ofori Ametepey, Clinton Aigbavboa, Hutton Addy, Nana Akua Asabea Gyadu-Asiedu
🤖 gxceed AI 要約
日本語
本研究は、ガーナの低容量舗装道路（LVR）のA1～A3（ゆりかごから門まで）のエンボディドカーボンのベースラインを初めて定量化した。PRISMAに基づく系統的レビューとシナリオモデルにより、アスファルトバインダーが質量の1%未満であるにもかかわらず排出量の30～34%を占めることを明らかにし、炭素削減の主要なレバーを特定した。
English
This study establishes the first peer-reviewed A1–A3 (cradle-to-gate) embodied carbon baseline for low-volume paved roads in Ghana. Using a PRISMA-guided systematic review and scenario modeling, it finds that bituminous binder accounts for 30–34% of emissions despite being <1% of pavement mass, identifying binder supply as the primary carbon lever. The methodology is reproducible for other regions.
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
ガーナに特化した研究だが、PRISMAに沿ったフレームワークとA1–A3ベンチマーク手法は日本の道路建設のカーボンアカウンティングにも応用可能であり、SSBJの開示要件が進む中で参考になる。
In the global GX context
This paper fills a critical gap in embodied carbon baselines for sub-Saharan African road infrastructure, providing a replicable methodology that strengthens carbon accounting in low-income countries and informs international procurement standards such as those under ISSB or CSRD.
👥 読者別の含意
🔬研究者:Provides a reproducible baseline and harmonisation method for road embodied carbon studies in data-scarce regions.
🏢実務担当者:Offers a benchmark for A1–A3 carbon emissions in low-volume road construction, useful for procurement and design decisions.
🏛政策担当者:Highlights the need for national carbon baselines in infrastructure and demonstrates a transparent methodology for developing countries.
📄 Abstract（原文）
Road infrastructure accounts for a substantial and systematically under-reported fraction of construction-related embodied carbon globally. Despite rapid network expansion across sub-Saharan Africa, no peer-reviewed study identified in the databases searched has established a quantified embodied-carbon baseline for Ghanaian road construction, creating a notable gap in national carbon accounting and low-carbon procurement policy. This study addresses that gap through two integrated components: a PRISMA 2020-guided systematic review of road-LCA and embodied-carbon literature, and a first-pass scenario model for Ghanaian low-volume paved roads (LVRs) bounded at A1–A3 (cradle-to-gate). Database searches of Scopus and Web of Science (14 March 2026) returned 3193 records; following deduplication and two-stage screening, 574 studies were included in the review. A staged harmonisation procedure converted 211 benchmark-shortlisted studies to comparable units, yielding a harmonisation subset of 29 studies and a final benchmark pool of 10 studies expressed as kgCO2e per lane-kilometre (3.5 m lane width). The scenario model applies emission factors from the ICE Database (Educational V4.1, 2025) to three pavement configurations drawn from the Ghana Manual for Low Volume Roads (Parts B and D), all surfaced with double bituminous surface treatment (DBST); Otta seal is evaluated as a sensitivity case. Results show A1–A3 embodied carbon of 14,165 kgCO2e/lane-km for Scenarios S1 and S3 (SC2/TLC 0.01 and SC4/TLC 1.0, respectively) and 12,564 kgCO2e/lane-km for Scenario S2 (SC3/TLC 0.3). Bituminous binder accounts for 30–34% of A1–A3 emissions despite representing less than 1% of pavement mass, identifying binder supply as the primary carbon lever. The two most structurally comparable benchmark studies, chip-seal treatments in the USA, bracket the Ghana values at 12,687–16,400 kgCO2e/lane-km, providing external plausibility validation. To the best of our knowledge, this study delivers a peer-reviewed, reproducible A1–A3 (cradle-to-gate) carbon baseline for Ghanaian LVR construction, a PRISMA-compliant synthesis of road embodied-carbon evidence, and a documented framework for early-stage carbon benchmarking in West African road infrastructure planning.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.3390/infrastructures11070210first seen 2026-06-25 04:48:16
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