石炭・農業廃棄物混焼灰を活用した低炭素コンクリート：曲げ強度と地球温暖化係数評価の相関
Low-Carbon Concrete Incorporating Co-combustion Coal – Agro-Waste: Correlating Flexural Strength and Global Warming Potential Assessment (原題)
Sul Munawir, Muhammad Akbar Caronge, Muhammad Wihardi Tjaronge
🤖 gxceed AI 要約
日本語
石炭と農業廃棄物の混焼で生じるフライアッシュ（CCAFA）とボトムアッシュ（CCABA）をコンクリート材料として再利用する可能性を検討した研究。CCAFA単独では曲げ強度が低下するがGWPは大幅に減少し、CCABA単独では多孔質構造のため強度が損なわれる。両者を併用すると相乗効果が生じ、CCAFA30%・CCABA50%の配合（MIX5）で曲げ強度4.75MPa、GWP254.92kg-CO2eq/m³、効率指数IFSが最大となった。インドネシアの重交通用剛性舗装の強度基準も満たし、構造性能と炭素削減の両立を示した。
English
This study tests co-combustion coal fly ash (CCAFA) as a partial cement replacement and co-combustion bottom ash (CCABA) as a fine-aggregate replacement in concrete. CCAFA alone cut GWP but lowered flexural strength, while CCABA alone impaired strength due to porosity. The combined mix (30% CCAFA, 50% CCABA) reached 4.75 MPa flexural strength with GWP of 254.92 kg CO2-eq/m³ and the highest strength-to-GWP efficiency, meeting Indonesian heavy-traffic pavement requirements.
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
日本では建設業のScope 3排出量（資材調達）が開示・削減の焦点となっており、セメント代替材のGWP低減効果を強度と紐付けて定量化する本手法は、建設企業のサプライチェーン排出削減・低炭素資材調達の根拠資料として参考になる。ただし制度・政策との直接的な接続は弱い。
In the global GX context
As ISSB/CSRD push Scope 3 disclosure into construction supply chains, quantifying the GWP reduction of cement substitutes alongside mechanical performance offers a replicable efficiency metric (strength-to-GWP index) for embodied-carbon accounting in building materials. The paper's Indonesian code linkage illustrates how national standards can anchor low-carbon material adoption.
👥 読者別の含意
🔬研究者:セメント代替材のGWP低減と力学性能を同時評価する効率指数（IFS）の設計例として、建設資材の炭素会計研究に応用できる。
🏢実務担当者:低炭素コンクリートの調達・設計において、強度と炭素強度を両立させる配合選定の実務的根拠を提供する。
🏛政策担当者:建設資材の炭素削減を国家強度基準と結びつける際、複合副産物利用の有効性を示す参考事例となる。
📄 Abstract（原文）
The increasing adoption of coal – agro-waste co-combustion in thermal power plants has generated significant quantities of co-combustion coal fly ash (CCAFA) and co-combustion coal bottom ash (CCABA), creating new challenges for sustainable ash management. Simultaneously, the concrete industry faces growing pressure to reduce greenhouse gas emissions associated with Portland cement production. This study investigates the feasibility of utilizing CCAFA as a partial replacement for Portland Composite Cement (PCC) and CCABA as a partial replacement for natural fine aggregate to develop low-carbon concrete with enhanced mechanical and environmental performance. Six concrete mixtures were prepared, comprising one control mixture and five modified mixtures incorporating 15 – 30 wt.% CCAFA and/or 50 wt.% CCABA. Beam specimens (100 × 100 × 400 mm) were water-cured for 28 days and evaluated through flexural strength testing in accordance with ASTM C78. Environmental performance was assessed using Global Warming Potential (GWP), while the overall sustainability of each mixture was quantified using the Flexural Strength-to-GWP Efficiency Index (IFS). The results revealed that CCAFA used alone reduced flexural strength but substantially decreased GWP because of lower cement consumption, whereas CCABA alone significantly impaired flexural performance owing to its porous structure and high-water absorption. However, the combined incorporation of CCAFA and CCABA produced a pronounced synergistic effect. The optimum mixture, containing 30 wt.% CCAFA and 50 wt.% CCABA (MIX 5), achieved the highest flexural strength of 4.75 MPa, corresponding to a Strength Activity Index of 149.84%, while reducing GWP to 254.92 kg CO₂-eq/m³ and attaining the highest IFS value of 0.0186 MPa·m³/kg CO₂-eq. Furthermore, MIX 5 satisfied the Indonesian flexural strength requirement for heavy-traffic rigid pavements, demonstrating that hybrid utilization of co-combustion ash can simultaneously enhance structural performance, reduce carbon emissions, and promote sustainable resource utilization in concrete production.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.29227/im-2026-02-01-103first seen 2026-11-06 04:51:42
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