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The Use of MSWI Fly Ash in Promoting Low-Titanium Slag Activation for Use in Low-Carbon Cementitious Materials

低炭素セメント材料のための低チタンスラグ活性化におけるMSWI飛灰の利用 (AI 翻訳)

Bo Su, Jie Chi, Siqi Zhang, Jia Li, Keqing Li, X.G Xu, Wen Ni

Recycling📚 査読済 / ジャーナル2026-05-27#その他Origin: CN
DOI: 10.3390/recycling11060098
原典: https://doi.org/10.3390/recycling11060098

🤖 gxceed AI 要約

日本語

本研究では、低チタンスラグ、MSWI飛灰、製鋼スラグ、排ガス脱硫石膏からなる四成分廃棄物ベース結合材を調製し、MSWI飛灰が低チタンスラグの活性化に及ぼす影響を解明した。最適配合では3日および90日で9.51MPaと46.32MPaの圧縮強度を達成し、MSWI飛灰を添加しない場合の5.66倍および1.04倍に相当した。MSWI飛灰はCaリッチなアルカリ活性化剤として機能し、エトリンジャイトやC-(A)-S-Hゲルの生成を促進するが、過剰添加はCa-Si-Alバランスを乱し強度低下を招く。この成果は、複数産業廃棄物の相乗的利用と低炭素セメント材料の可能性を示す。

English

This study prepared a quaternary solid-waste-based binder from low-titanium slag, MSWI fly ash, steel slag, and FGD gypsum, demonstrating that MSWI fly ash acts as a Ca-rich alkaline activator for low-titanium slag. The optimal mix achieved compressive strengths of 9.51 MPa and 46.32 MPa at 3 and 90 days, significantly improving over the reference without MSWI fly ash. Moderate MSWI fly ash promoted ettringite and C-(A)-S-H gel formation, while excess disrupted the Ca-Si-Al balance. This provides a feasible route for synergistic utilization of multiple solid wastes in low-carbon cementitious materials.

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

日本では廃棄物処理とセメント産業の低炭素化が重要な課題であり、MSWI飛灰の有効活用は廃棄物最終処分場の延命とCO2削減に寄与する。本研究成果は、国内の焼却灰リサイクル技術や低炭素コンクリート開発に示唆を与える。

In the global GX context

Globally, the cement industry accounts for ~8% of CO2 emissions. This paper presents a method to valorize municipal solid waste incineration fly ash and industrial slags into low-carbon binders, supporting circular economy and decarbonization goals. It offers a practical approach for reducing clinker factor and landfill burden, relevant to global efforts in sustainable construction materials.

👥 読者別の含意

🔬研究者:Provides experimental evidence on MSWI fly ash as an alkaline activator in low-titanium slag systems, with insights into hydration product evolution and optimal dosage for strength.

🏢実務担当者:Cement and waste management companies can explore this binder formulation for commercial low-carbon products, utilizing MSWI fly ash as a resource rather than hazardous waste.

🏛政策担当者:Highlights a viable pathway for co-processing multiple solid wastes in construction materials, supporting policies on waste-to-resource and industrial decarbonization.

📄 Abstract（原文）

A quaternary solid-waste-based binder was prepared from low-titanium slag, municipal solid waste incineration (MSWI) fly ash, steel slag, and flue-gas desulfurization gypsum (FGDG) to clarify the activating effect of MSWI fly ash on low-titanium slag and its influence on hydrate evolution. Unlike conventional solid-waste-based binders in which MSWI fly ash is mainly regarded as a hazardous residue requiring stabilization, this study demonstrates its specific role as a Ca-rich alkaline activator for promoting low-titanium slag depolymerization and coordinated hydrate formation. The results showed that the compressive strength first increased and then decreased with increasing MSWI fly ash content. Considering both strength development and MSWI fly ash utilization, the optimum mixture was identified as low-titanium slag:MSWI fly ash:steel slag:FGDG = 43.0:17.2:25.8:14.0, with compressive strengths of 9.51 and 46.32 MPa at 3 and 90 d, respectively. These values corresponded to 5.66 and 1.04 times those of the reference mixture without MSWI fly ash, respectively. Ettringite and C-(A)-S-H gel were the main strength-contributing hydration products, while Friedel’s salt was identified as a chloride-bearing AFm phase. Moderate MSWI fly ash addition promoted alkaline activation and low-titanium slag depolymerization, leading to increased formation of ettringite, C-(A)-S-H gel, and Friedel’s salt, which contributed to improved compressive strength. In contrast, excessive MSWI fly ash disturbed the Ca-Si-Al balance and inhibited effective hydrate formation. These results demonstrate that MSWI fly ash can serve as an effective Ca-rich activator for low-titanium-slag-based low-carbon cementitious materials and provide a feasible route for the synergistic utilization of multiple solid wastes.

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