低炭素コンクリート向け林業バイオ炭の環境ライフサイクル評価：バイオジェニック炭素会計の影響
Environmental life cycle assessment of forestry biochar for low-carbon concrete: influence of biogenic carbon accounting (原題)
Supun Karunarathna, Chamila Gunasekara, David William Law, Yulin Patrisia, Letiscia Xavier, Sujeeva Setunge
🤖 gxceed AI 要約
日本語
林業残渣・植林木由来のバイオ炭をコンクリートの砂15%代替として用いたcradle-to-gate LCA。4種の可搬型炭化システムを比較し、バイオジェニック炭素会計の手法選択がGWP結果を大きく左右することを示した。炭素隔離を含めるとバイオ炭コンクリートは従来比約40%低GWP、推奨アプローチではネットネガティブとなる一方、酸性化・富栄養化等は輸送由来で増加した。
English
A cradle-to-gate LCA of forestry-derived biochar used as a 15% sand replacement in 32 MPa concrete, comparing four portable production systems. Biogenic carbon accounting choice strongly drives GWP results: with sequestration included, biochar concrete shows ~40% lower net GWP than conventional concrete, and the recommendation approach yields net-negative GWP. Non-GWP impacts (acidification, eutrophication) rise due to forestry operations and transport, which contributes up to 78% in some categories.
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
建設資材のScope 3排出・ embodied carbon 開示が進む中、バイオジェニック炭素の扱いはSSBJやGHGプロトコル準拠の算定実務に直結する論点。日本企業が低炭素コンクリートを調達・訴求する際の算定透明性の重要性を示す。
In the global GX context
As embodied carbon disclosure in construction materials gains traction under ISSB/CSRD and GHG Protocol, how biogenic carbon is accounted for is a live methodological question. The paper quantifies how accounting choices swing GWP outcomes, informing transparent system boundaries for low-carbon material claims.
👥 読者別の含意
🔬研究者:バイオジェニック炭素会計の方法論選択がLCA結果をどう変えるかを定量化した比較事例として有用。
🏢実務担当者:低炭素コンクリートの調達・環境訴求時に、炭素会計前提と輸送由来影響の開示が不可欠である点を実務に反映できる。
🏛政策担当者:建設資材の低炭素表示や炭素会計ルール設計で、バイオジェニック炭素の扱いと輸送影響の扱いを明確化する必要性を示す。
📄 Abstract（原文）
Abstract As global interest grows in innovative and sustainable uses of biomass, understanding the environmental implications of integrating timber-derived biochar into concrete is increasingly important. This study presents a cradle-to-gate life cycle assessment (LCA) of biochar production and its application as a 15% sand replacement in 32 MPa concrete, evaluating four portable biochar production systems, the 6050 Carbonator, Air Curtain Burner, Oregon Kiln, and Biochar Systems Incorporated, using feedstocks sourced from forest residues and plantation-derived timber. Two biogenic carbon accounting approaches were applied: the carbon–neutral approach and the recommendation approach. The results show that carbon accounting choices strongly influence Global Warming Potential (GWP) outcomes. Under the Carbon–Neutral approach, the 6050 Carbonator exhibited the lowest net GWP (–1.90 kg CO 2 -eq kg⁻ 1 biochar), while the corresponding biochar-modified concrete achieved an approximately 40% lower net GWP than conventional concrete when carbon sequestration was included. Under the Recommendation approach, which explicitly includes biogenic CO 2 flows, the plantation-derived biochar concrete scenario achieved a net-negative GWP of –17.49 kg CO 2 -eq m⁻ 3 due to biogenic carbon uptake during forest growth. However, several non-GWP impact categories, including acidification, ozone depletion, and eutrophication, increased due to forestry operations and long-distance transportation, with transport contributing up to 78% of impacts in some categories. Overall, the study demonstrates the strong influence of biomass sourcing assumptions and biogenic carbon accounting methodology on LCA outcomes for biochar-based concrete systems. The findings highlight the potential of forestry biochar to support lower-carbon construction while emphasizing the importance of transparent system boundaries, transport logistics, and carbon accounting approaches in sustainability assessments.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1007/s11356-026-38335-1first seen 2026-11-06 04:49:01
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