天然纤维增强MgO-SiO2 （fs - ms）复合材料的碳化研究

IF 10.8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement & concrete composites Pub Date : 2025-03-17 DOI:10.1016/j.cemconcomp.2025.106052

Bo Wu, Jishen Qiu

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引用次数: 0

摘要

活性镁水泥（RMC）严重依赖二氧化碳源来获得足够的机械强度，限制了其生产效率。本研究开发了天然纤维增强MgO-SiO2 （fs - ms）复合材料，其中镁硅酸盐水合物（M-S-H）的形成产生了足够的早期强度（例如>； 30mpa），随后残余水镁石的碳化使强度持续发展（例如>； 70mpa）。NFs的存在不仅加速了MS复合材料在湿固化和后续碳化固化下的强度增加，而且有效地提高了MS复合材料的体积稳定性和CO2固存能力。碳化固化使纤维-基体界面区致密化，提高了纤维-基体界面性能和拉伸性能。水碳酸化实验结果表明，合成的M-S-H与MgO/水镁石相比具有更高的化学稳定性。然而，也观察到Mg2+从M-S-H中部分浸出，这表明M-S-H相具有碳酸化潜力。这些结果表明，nffs - ms复合材料在不需要特殊的CO2预固化的情况下，具有直接应用于承重结构的巨大潜力。

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Carbonation of natural fibers reinforced MgO-SiO2 (NFs-MS) composites

The heavy reliance of reactive magnesia cement (RMC) on CO₂ sources to gain sufficient mechanical strength limits its productivity. The present work developed natural fibers reinforced MgO-SiO₂ (NFs-MS) composites, in which the formation of magnesium-silicate-hydrate (M-S-H) yielded sufficient early strength (e.g., >30 MPa), and subsequent carbonation of residual brucite enabled continuous strength development (e.g., >70 MPa). The presence of NFs in MS composites not only accelerates the strength gain under moisture curing and subsequent carbonation curing, but also effectively improves the volume stability and CO₂ sequestration. Moreover, carbonation curing densified the fiber-matrix interface zone, leading to improved fiber-matrix interfacial properties and tensile performance. The results from aqueous carbonation test show that the synthetic M-S-H has greater chemical stability compared to MgO/brucite. However, partial leaching of Mg²⁺ from M-S-H was also observed, implying the carbonation potential of M-S-H phase. These findings suggest that NFs-MS composites hold great potential to be directly applied in load-bearing structures without requirement for special CO₂ pre-curing.

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来源期刊

Cement & concrete composites 工程技术-材料科学：复合

CiteScore

18.70

自引率

11.40%

发文量

459

审稿时长

65 days

期刊介绍： Cement & concrete composites focuses on advancements in cement-concrete composite technology and the production, use, and performance of cement-based construction materials. It covers a wide range of materials, including fiber-reinforced composites, polymer composites, ferrocement, and those incorporating special aggregates or waste materials. Major themes include microstructure, material properties, testing, durability, mechanics, modeling, design, fabrication, and practical applications. The journal welcomes papers on structural behavior, field studies, repair and maintenance, serviceability, and sustainability. It aims to enhance understanding, provide a platform for unconventional materials, promote low-cost energy-saving materials, and bridge the gap between materials science, engineering, and construction. Special issues on emerging topics are also published to encourage collaboration between materials scientists, engineers, designers, and fabricators.