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Mechanical Properties and Damage Evolution of Shield Tunnel Spoil Solidified with Basalt Fiber-Reinforced Low-Carbon Cementitious Materials Under Drying–Wetting Cycles

乾湿繰返し下における玄武岩繊維補強低炭素セメント固化シールドトンネルズリの力学特性と損傷進展 (AI 翻訳)

Yuhan Li, Henggen Zhang, Xujiayin Zhao

Materials📚 査読済 / ジャーナル2026-05-07#その他Origin: CN
DOI: 10.3390/ma19101920
原典: https://doi.org/10.3390/ma19101920

🤖 gxceed AI 要約

日本語

本研究では、産業廃棄物をセメントの代替としたグリーン複合セメント材料に玄武岩繊維を添加し、シールドトンネルズリの固化処理と耐久性向上を検討。乾湿繰返し試験の結果、0.45%の繊維添加で一軸圧縮強度が約13%向上し、1.00%添加で細孔・き裂体積が半減以上減少。繊維の架橋効果が劣化を抑制することをCT分析で確認した。

English

This study develops a green composite cementitious material partially replacing cement with industrial solid wastes, reinforced with basalt fibers, for stabilizing shield tunnel spoil. Under drying-wetting cycles, 0.45% basalt fiber improves early UCS by ~13%, and 1.00% reduces pore and crack volumes by 54% and 63% respectively after 8 cycles. CT analysis reveals the bridging effect of fibers restrains crack propagation, providing a basis for green disposal and durable construction.

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

日本の建設現場でもシールドトンネルズリの処理は課題であり、低炭素セメントによる固化技術は循環型社会とGXに貢献する可能性がある。ただし本論文は中国の材料実験に基づいており、日本の土質条件への適用には追加検証が必要。

In the global GX context

This materials science study on low-cement binders and fiber reinforcement for construction waste stabilization fits the global push for decarbonization of the building sector. However, it is primarily an engineering performance study, not directly addressing carbon accounting or policy frameworks like ISSB or TCFD.

👥 読者別の含意

🔬研究者:Materials researchers can learn about the synergistic effect of industrial waste-based cement and basalt fibers on durability under cyclic wetting.

🏢実務担当者:Civil engineering firms may consider this approach for sustainable tunnel spoil disposal and improved long-term stability.

📄 Abstract（原文）

This study aims to develop a green composite cementitious material (GCCM) by partially replacing cement with multiple industrial solid wastes and to further enhance its toughness by incorporating basalt fibers (BF) for the effective disposal of shield tunnel spoil (STS). The deterioration behavior of STS synergistically improved by GCCM and BF was systematically investigated under drying–wetting (D-W) cycles using unconfined compressive strength (UCS) tests, mass loss and P-wave velocity measurements, as well as industrial computed tomography (CT) and scanning electron microscopy (SEM). The results show that BF significantly improves the early-age strength and deformation toughness of STS, with an optimal UCS increase of about 13% at 0.45% BF. Although the mechanical properties of the specimens deteriorated with an increasing number of D-W cycles, the “bridging effect” of BF effectively inhibited the propagation and coalescence of cracks. Quantitative CT analysis further revealed that the addition of 1.00% BF reduced the pore volume (Vk) and crack volume (Vl) by 54.3% and 63.2%, respectively, after eight D-W cycles. The damage mechanism is primarily attributed to the loss of cementitious materials caused by water migration and the swelling–shrinkage stress of clay minerals. The three-dimensional (3D) network structure formed by BF, through its pull-out energy dissipation mechanism, effectively maintained the macro- and microstructural integrity of the material. This study highlights the novelty of combining GCCM with BF to enhance the long-term durability of STS, providing a theoretical basis and technical support for its green disposal and engineering application in complex environments.

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