Valorization of coal gangue as a sustainable supplementary cementitious material for immersed tube tunnel construction: equivalent strength performance in LC3 systems
石炭ガンギューの有効活用によるLC3セメントの持続可能性評価：水中トンネル建設での同等強度性能 (AI 翻訳)
Haibin Li, Hua Liu, Lingchen Kong, Xiaohui Liu, Zhennan Wang, Yongshun Zhang, Junfei Zhang, Ling Wang
🤖 gxceed AI 要約
日本語
本研究は、石炭ガンギュー（CG）を熱活性化してLC3セメントの原料として利用する可能性を多角的に検討。最適な配合比（CG:石灰石=2:1、CG置換率20%）で、商用の焼成粘土を用いたLC3と同等の圧縮強度を達成し、さらにLCAにより従来のポルトランドセメントと比較して地球温暖化係数を24.4%削減できることを示した。これはセメント産業の脱炭素化と産業廃棄物処理に貢献する。
English
This study investigates thermally activated coal gangue (CCG) as a low-cost substitute for commercial calcined clays in limestone calcined clay cement (LC3). With optimal mix design (CCG:limestone=2:1, 20% replacement), it achieves 28-day compressive strength comparable to commercial LC3 and ordinary Portland cement. Life cycle assessment shows 24.4% reduction in global warming potential. The study provides a sustainable pathway for cement decarbonization and industrial waste valorization.
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
日本でもセメント産業はCO2排出の主要源であり、LC3技術の普及が期待されているが、高価な焼成粘土の調達が課題。石炭ガンギューは日本の石炭火力発電所から大量に発生する廃棄物であり、その有効活用は廃棄物処理と脱炭素の両面で重要。本研究は、日本のセメント・建設業界にとってコスト削減と環境負荷低減の両立に資する知見を提供する。
In the global GX context
Cement industry accounts for ~8% of global CO₂ emissions. LC3 is a promising low-carbon technology but relies on expensive calcined clays. This paper demonstrates that coal gangue, a widespread industrial waste from coal mining and power generation, can serve as an effective alternative, reducing both cost and emissions. It offers a scalable solution for emerging economies with abundant coal waste and supports global decarbonization targets.
👥 読者別の含意
🔬研究者:Provides experimental validation and LCA for coal gangue-based LC3, including reaction mechanisms and pore structure analysis.
🏢実務担当者:Offers a low-cost alternative to commercial calcined clays for LC3 cement production, with a 24.4% carbon reduction potential.
🏛政策担当者:Supports policies promoting industrial waste utilization in low-carbon cement; demonstrates a circular economy approach for coal waste.
📄 Abstract（原文）
The cement industry is a major source of global CO₂ emissions, and limestone calcined clay cement (LC³) is a promising low-carbon alternative, but its large-scale application is limited by the dependence on high-cost commercial calcined clays. Coal gangue (CG) is a massive industrial solid waste with potential pozzolanic activity after thermal activation, yet its reaction behavior, synergistic mechanisms, and performance equivalence to commercial calcined clays in LC³ systems remain unclear, with a lack of quantitative assessment of its carbon emission reduction potential. To address these gaps, this study conducts a multi-scale investigation on thermally activated coal gangue (CCG)-based LC³ cement, combining experimental characterization including X-ray diffraction, thermogravimetric analysis, scanning electron microscopy, mercury intrusion porosimetry, isothermal calorimetry and life cycle assessment. The results show that the optimal mass ratio of CCG to limestone is 2:1, and the LC³ formulation with 20% CCG replacement achieves a 28-day compressive strength comparable to that of commercial calcined clay-based LC³ and ordinary Portland cement. A synergistic reaction mechanism involving sulfate, carbonate, and aluminosilicate is clarified: gypsum regulates early aluminate hydration, while limestone reacts with reactive aluminates derived from CCG to form stable carboaluminate phases, which refine the pore structure and densifying the microstructure. LCA results indicate that the optimal CCG-based LC³ formulation reduces the global warming potential by 24.4% compared to ordinary Portland cement. This study realizes the high-value utilization of CG and provides a low-cost, sustainable alternative to commercial calcined clays for LC³ technology, offering technical support for the decarbonization of the cement industry and the disposal of industrial solid waste.
🔗 Provenance — このレコードを発見したソース
- semanticscholar https://doi.org/10.1038/s41598-026-48445-yfirst seen 2026-06-29 06:49:29
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