再生骨材と籾殻灰を用いた低炭素コンクリートのライフサイクルアセスメント
Life cycle assessment of low carbon concrete using recycled concrete aggregate and rice husk ash (原題)
Niña Isabelle S. Castillo, Ariel Miguel M. Aragoncillo, B T Magadia, Maria Victoria Migo-Sumagang, Michael Vincent O. Laurio
🤖 gxceed AI 要約
日本語
本研究は、再生骨材（RCA）と籾殻灰（RHA）を部分置換した低炭素コンクリートのゆりかごからゲートまでのライフサイクルアセスメントを実施。10%RHAと100%RCAの組み合わせでGWPを7.55%削減し、圧縮強度も確保。輸送や前処理を含む感度分析で結果の頑健性を確認し、循環型材料戦略の有効性を示した。
English
This study conducts a cradle-to-gate LCA of low-carbon concrete using recycled concrete aggregate (RCA) and rice husk ash (RHA). The 10% RHA-100% RCA mix achieves a 7.55% GWP reduction while meeting compressive strength requirements. Sensitivity analyses confirm robustness, demonstrating the effectiveness of circular material substitution for embodied carbon reduction.
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
日本の建設業界では、カーボンニュートラル達成に向けてコンクリートの低炭素化が急務。本研究成果は、再生骨材や産業副産物の活用による環境負荷低減の定量的根拠を提供し、今後の建設資材の調達判断や環境報告に活用できる。
In the global GX context
Globally, the construction sector faces pressure to reduce embodied carbon. This study provides empirical evidence on the environmental benefits of using recycled aggregates and agricultural by-products in concrete, supporting circular economy strategies and contributing to the growing body of LCA literature on low-carbon construction materials.
👥 読者別の含意
🔬研究者:Provides a comprehensive LCA framework and comparative analysis of RCA-RHA concrete mixtures, useful for further research on circular construction materials.
🏢実務担当者:Offers actionable data on the environmental and performance trade-offs of using RCA and RHA in concrete, aiding sustainable material selection.
🏛政策担当者:Highlights the potential of circular material substitution in reducing construction emissions, informing policies that promote low-carbon building materials.
📄 Abstract（原文）
Reducing embodied carbon in concrete production requires a systems-level evaluation of alternative material pathways across the entire production lifecycle. This study presents a cradle-to-gate life cycle assessment of low-carbon concrete incorporating recycled concrete aggregate (RCA) and rice husk ash (RHA) as partial aggregate and cement replacements, respectively. Secondary data on ten concrete scenarios with varying replacement levels of RCA (0%, 25%, 50%, 75%, and 100%) and RHA (0% and 10%) were adopted and assessed across multiple environmental impact categories, including global warming potential (GWP), mineral resource scarcity (MRS), terrestrial acidification, freshwater ecotoxicity, water consumption (WC), human carcinogenic toxicity, and cumulative energy demand (CED). Transportation and preprocessing stages were incorporated to capture environmental tradeoffs associated with circular material integration. Cement replacement with 10% RHA reduced GWP by 6.45%, while full replacement of natural coarse aggregates with RCA reduced GWP by 1.12%. Among all mixtures, the 10% RHA-100% RCA mixture exhibited the lowest environmental burdens, achieving 7.55% GWP reduction, 6.09% CED reduction, 10% reduction in MRS, and 68.5% reduction in WC relative to conventional concrete while satisfying the required compressive strength (> 21 MPa). Sensitivity and scenario analyses confirmed that comparative environmental ranking remained unchanged under variations in transportation, RHA production yield, cement manufacturing efficiency, and transportation modes. Sustainability performance indicators further showed superior durability-oriented sustainability of RCA-RHA concrete mixtures despite moderate reductions in compressive strength. Overall, the findings demonstrate that lifecycle-informed circular material substitution strategies support embodied-carbon reduction, resource conservation, and durability enhancement in concrete production without compromising structural feasibility.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.20517/cf.2026.71first seen 2026-08-20 04:42:14
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