Ma Chunyu, Wang Liang, Li Yujiao, Li Qiuyi, Yue Gongbing, Guo Yuanxin, Wang Meinan, Zhou Xiaolong
College of Civil Engineering & Architecture, Qingdao Agricultural University, Qingdao 266109, China.
Nanomaterials (Basel). 2025 Jun 26;15(13):993. doi: 10.3390/nano15130993.
Recycled wood fiber (RWF) obtained through the multi-stage processing of waste wood serves as an eco-friendly green construction material, exhibiting lightweight, porous, and high toughness characteristics that demonstrate significant potential as a cementitious reinforcement, offering strategic advantages for environmental protection and resource recycling. In this study, high-performance sulfoaluminate cement (SAC)-RWF composites prepared by modifying RWFs with nano-silica (NS) and a silane coupling agent (KH560) were developed and their effects on mechanical properties, shrinkage behavior, hydration characteristics, and microstructure of SAC-RWF composites were systematically investigated. Optimal performance was achieved at water-cement ratio of 0.5 with 20% RWF content, where the KH560-modified samples showed superior improvement, with 8.5% and 14.3% increases in 28 d flexural and compressive strength, respectively, compared to the control groups, outperforming the NS-modified samples (3.6% and 8.6% enhancements). Both modifiers improved durability, reducing water absorption by 6.72% (NS) and 7.1% (KH560) while decreasing drying shrinkage by 4.3% and 27.2%, respectively. The modified SAC composites maintained favorable thermal properties, with NS reducing thermal conductivity by 6.8% through density optimization, whereas the KH560-treated specimens retained low conductivity despite slight density increases. Micro-structural tests revealed accelerated hydration without new hydration product formation, with both modifiers enhancing cementitious matrix hydration product generation by distinct mechanisms-with NS acting through physical pore-filling, while KH560 established Si-O-C chemical bonds at paste interfaces. Although both modifications improved mechanical properties and durability, the KH560-modified SAC composite group demonstrated superior overall performance than the NS-modified group, providing a technical pathway for developing sustainable, high-performance recycled wood fiber cement-based materials with balanced functional properties for low-carbon construction applications.
通过废木材的多阶段加工获得的再生木纤维（RWF）是一种环保型绿色建筑材料，具有轻质、多孔和高韧性的特点，作为水泥增强材料具有巨大潜力，为环境保护和资源回收提供了战略优势。在本研究中，开发了用纳米二氧化硅（NS）和硅烷偶联剂（KH560）对RWF进行改性制备的高性能硫铝酸盐水泥（SAC）-RWF复合材料，并系统研究了它们对SAC-RWF复合材料的力学性能、收缩行为、水化特性和微观结构的影响。在水灰比为0.5、RWF含量为20%时达到最佳性能，其中KH560改性样品表现出更好的改善效果，与对照组相比，28天抗折强度和抗压强度分别提高了8.5%和14.3%，优于NS改性样品（提高了3.6%和8.6%）。两种改性剂均提高了耐久性，NS使吸水率降低了6.72%，KH560使吸水率降低了7.1%，同时干燥收缩率分别降低了4.3%和27.2%。改性后的SAC复合材料保持了良好的热性能，NS通过密度优化使热导率降低了6.8%，而KH560处理的样品尽管密度略有增加，但仍保持低导率。微观结构测试表明水化加速但没有形成新的水化产物，两种改性剂通过不同机制增强了水泥基基质水化产物的生成——NS通过物理填孔起作用，而KH560在浆体界面建立了Si-O-C化学键。虽然两种改性都改善了力学性能和耐久性，但KH560改性的SAC复合材料组总体性能优于NS改性组，为开发具有平衡功能特性的可持续、高性能再生木纤维水泥基材料用于低碳建筑应用提供了技术途径。
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