Effects of biochar on hydration, strength degradation, and alkali-silica reaction in sustainable waste glass sand-based mortars

IF 7.4 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of building engineering Pub Date : 2025-10-06 DOI:10.1016/j.jobe.2025.114316

Xuqun Lin , Tianxing Shi , Quang Dieu Nguyen , Arnaud Castel , Vivian W.Y. Tam

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引用次数: 0

Abstract

The biochar in concrete structures has attracted a lot of attention, offering new biomass recycling strategies while improving mechanical and durability properties of the biochar-cement composites. This study investigated the alkali-silica reaction (ASR) in waste glass sand-based mortars with three biochar, including corn cob biochar (CCB), waste wood biochar (WWB), and rice husk biochar (RHB), using the accelerated mortar bar test (AMBT) up to 96 days. Due to the fine biochar size (<100 μm, D90 = 34.67 μm), samples with 5 wt% CCB exhibited the lowest mortar bar expansion and mass gain up to 96-day of exposure in 1M NaOH bath at 80 °C, while experiencing the lowest strength loss. X-ray diffraction patterns indicated increased intensity of ASR gels, including tobermorite-type C-S-H and alkali-silicate-hydrates (ASH) in all groups. Thermogravimetric analysis (TG) results revealed that CCB5 had the lowest mass loss of ASR gels after 96 days in the 1M NaOH bath. Biochar degradation due to ASR was observed using Backscattered Electron images. Finally, it was recommended that up to 10 wt% fine-size corn cob biochar (<100 μm, D90 = 34.67 μm) could be conservatively used to partially replace cement content for sustainable concrete design.

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生物炭对废玻璃砂基砂浆水化、强度降解及碱-硅反应的影响

生物炭在混凝土结构中的应用引起了人们的广泛关注，在提高生物炭-水泥复合材料力学性能和耐久性的同时，提供了新的生物质循环利用策略。采用加速砂浆棒试验（AMBT），研究了废玻璃砂基砂浆与玉米芯生物炭（CCB）、废木材生物炭（WWB）和稻壳生物炭（RHB）的碱-硅反应（ASR）。由于生物炭粒度细小（<100 μm, D90 = 34.67 μm），含5 wt% CCB的样品在80°C的1M NaOH浴中暴露96天后砂浆棒膨胀和质量增加最小，同时强度损失最小。x射线衍射图显示，ASR凝胶的强度增加，包括托贝莫来石型C-S-H和碱硅酸盐水合物（ASH）。热重分析（TG）结果显示，CCB5在1M NaOH浴中作用96天后，ASR凝胶的质量损失最低。利用背散射电子图像观察了生物炭的ASR降解。最后，建议使用高达10 wt%的细粒玉米芯生物炭（<100 μm, D90 = 34.67 μm）保守地部分替代水泥含量，以实现可持续混凝土设计。

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来源期刊

Journal of building engineering Engineering-Civil and Structural Engineering

CiteScore

10.00

自引率

12.50%

发文量

1901

审稿时长

35 days

期刊介绍： The Journal of Building Engineering is an interdisciplinary journal that covers all aspects of science and technology concerned with the whole life cycle of the built environment; from the design phase through to construction, operation, performance, maintenance and its deterioration.