ブラジル連邦区の実規模リサイクルプラント由来再生コンクリート骨材の炭素固定ポテンシャル：実験室炭酸化研究
Carbon Capture Potential of Recycled Concrete Aggregates from a Full-Scale Recycling Plant in the Brazilian Federal District: A Laboratory Carbonation Study (原題)
Pedro Sousa, João Henrique da Silva Rêgo, Yuri Sotero Bomfim Fraga, Valdirene Maria Silva Capuzzo, Ana María Guerrero Bustos, Moisés Frı́as
🤖 gxceed AI 要約
日本語
ブラジル連邦区の実リサイクルプラントから採取した再生砂・粗骨材2種を、25℃・60%RH・3%CO2で加速炭酸化しCO2固定量を評価した研究。純質量増加は0.318〜1.358%で、粗骨材由来試料が砂由来を上回った。TG分析で550〜950℃の質量減少が処理後に増加し、付着ペースト中のCaCO3生成を裏付けた。吸水率低下と密度上昇も細孔充填と整合し、産業規模での確認には複数プラント・反復試験・プロセス炭素収支が必要と結論づける。
English
This study quantifies CO2 uptake by recycled sand and two coarse recycled concrete aggregate fractions from a single industrial recycling plant in Brazil's Federal District, sampled across two campaigns. Accelerated carbonation (25°C, 60% RH, 3% CO2) yielded net mass gains of 0.318–1.358%, with coarse-fraction specimens exceeding sand-derived ones. TG showed increased 550–950°C mass loss after treatment, confirming CaCO3 formation in adhered paste, while water absorption fell and density rose. Industrial-scale confirmation requires multi-plant sampling, replicated testing and a process-level carbon balance.
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
建設廃材の炭酸化によるCO2固定は、日本でもコンクリート再資源化・カーボンリサイクル政策と親和的だが、本論文はブラジル事例でSSBJ・有報開示への直接示唆は薄い。日本の建設業がScope 3・循環経済の観点で再生骨材の炭素固定効果を検討する際の実証的参照点となる。
In the global GX context
Adds rare industrial-line evidence to the emerging literature on CO2 mineralization in recycled concrete aggregates, relevant to embodied-carbon accounting and circular-economy claims under CSRD/EPD frameworks. It highlights that lab-made aggregate uptake values may not transfer to real recycling streams, a caveat for construction-sector Scope 3 and product carbon footprint reporting.
👥 読者別の含意
🔬研究者:Provides industrially sourced carbonation-uptake data and a TG-corroborated method, useful for benchmarking lab vs. real-stream RCA studies.
🏢実務担当者:Construction and materials teams can note that recycled aggregate carbonation offers modest CO2 fixation and property changes, but industrial-scale carbon balances are not yet established.
🏛政策担当者:Suggests carbon-uptake claims for recycled aggregates need standardized multi-plant verification before inclusion in carbon accounting or procurement incentives.
📄 Abstract（原文）
Accelerated carbonation of recycled concrete aggregates (RCA) can fix CO₂ while modifying aggregate properties, but most reported uptake values come from laboratory-produced aggregates that do not reproduce the heterogeneity of material leaving a real recycling line. This study assesses the carbon uptake of recycled sand and two coarse RCA fractions from a single industrial recycling plant in the Federal District, Brazil, sampled in two production campaigns. Carbonation was performed at 25°C, 60% relative humidity and 3% CO₂. Uptake was quantified by the net mass gain of crushed 1.18–2.36 mm specimens kept in moisture equilibrium with the test environment, and corroborated by thermogravimetric analysis (TG). Net mass gains ranged from 0.318% to 1.358%, and specimens derived from the coarse fractions exceeded those derived from the sand (0.318–0.638%). X-ray diffraction of the non-carbonated material showed a weak calcite reflection and no detectable dolomite peaks, indicating carbonate already present in the adhered paste rather than carbonate rock. TG mass loss in the 550–950°C range increased after treatment in all six samples, evidencing CaCO₃ formation in the adhered paste. Water absorption decreased by 0.08–0.41 percentage points and oven-dry density increased by 0.016–0.023 g/cm³ in single paired determinations, consistent with pore filling by carbonate. Accelerated carbonation therefore fixes CO₂ in industrially produced recycled aggregates, and confirmation at industrial scale requires multi-plant sampling, replicated testing and a process-level carbon balance.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1016/j.rineng.2026.113853first seen 2026-11-04 04:54:44 · last seen 2026-11-06 04:53:25
🔔 こうした論文の新着を逃したくない方は キーワードアラート に登録（無料・3キーワードまで）。
gxceed は公開メタデータに基づく研究支援データセットです。要約・翻訳・解説は AI 支援で生成されています。 最終的な解釈・検証は利用者が原典資料に基づいて行うことを前提とします。