Microscopic mechanism of cellulose nanofibers modified cemented gangue backfill materials

IF 23.2 2区 材料科学 Q1 MATERIALS SCIENCE, COMPOSITES
Jiangyu Wu, Shuo Yang, Marcus Williamson, Hong S. Wong, Tushar Bhudia, Hai Pu, Qian Yin, Dan Ma, Weiqiang Chen
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Abstract

Reinforcing the performances of cemented backfill materials to recycle gangue and tailings is crucial for the sustainable development of mineral resources and mining waste management. However, under practical constraints of low cost, high waste ratio, low carbon emission, and low binder consumption, solidifying upcycles of mining wastes with toxicity, porosity, and mollification to cemented backfill materials with superior properties are inherently contradictory and challenging. This study reported a waste-to-wealth pathway that improves cemented gangue backfill materials by cellulose nanofibers to recycle mining wastes and partially replace cement. Mechanical compression, X-ray diffraction, thermogravimetry, mercury intrusion porosimetry, scanning electron microscopy tests, fractal quantitative analyses of microstructures, and molecular dynamics simulations were carried out to reveal the action mechanism of TEMPO-modified cellulose nanofibers on cemented gangue backfill materials. The difference in the contribution of TEMPO-modified cellulose nanofibers and mechanical cellulose nanofibers to the strengths of cemented gangue backfill materials was analyzed. The results show a series of microscopic improvements of cellulose nanofibers on cemented gangue backfill materials, including regulating cemented gel polymerization, increasing hydration nucleation, inhibiting carbonization, densifying pore structure, enhancing Ca-O connections and H bonds, and preventing C-S–H fracture along interlayer water. Excessive cellulose nanofibers are also found to be harmful to this composite mainly by delaying hydration crystallization and increasing pores by entrapping air, while it still exhibits improvements in deformation resistance and energy absorption despite strength deterioration. The strength and energy absorption reinforcements of this cemented hybrid materials induced by cellulose nanofibers with optimal dosage can reach up to 30 ~ 50%.

纤维素纳米纤维改性胶结矸石充填材料的微观机理
加强胶结充填体对矸石尾矿的回收利用性能,对矿产资源的可持续发展和矿山废弃物的治理具有重要意义。然而,在低成本、高废比、低碳排放、低粘结剂消耗的现实约束下,将具有毒性、多孔性、软化性的矿山废弃物固化升级为性能优越的胶结充填材料,存在着内在的矛盾和挑战。本研究报道了一种废物转化财富的途径,通过纤维素纳米纤维改善胶结矸石回填材料,回收采矿废物并部分取代水泥。通过力学压缩、x射线衍射、热重、压汞孔隙度、扫描电镜、微观结构分形定量分析和分子动力学模拟等方法,揭示了tempo改性纤维素纳米纤维对胶结矸石充填材料的作用机理。分析了tempo改性纤维素纳米纤维与机械改性纤维素纳米纤维对胶结矸石充填材料强度贡献的差异。结果表明,纤维素纳米纤维在胶结矸石充填材料上具有调控胶结凝胶聚合、增强水化成核、抑制碳化、致密孔隙结构、增强Ca-O连接和H键、防止C-S-H沿层间水断裂等一系列微观改善作用。过量的纤维素纳米纤维对复合材料的危害主要表现在延迟水化结晶和增加气孔,尽管其强度下降,但其抗变形能力和能量吸收能力仍有所提高。纤维素纳米纤维对该复合材料的增强强度和吸能性能均可达到30 ~ 50%。
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来源期刊
CiteScore
26.00
自引率
21.40%
发文量
185
期刊介绍: Advanced Composites and Hybrid Materials is a leading international journal that promotes interdisciplinary collaboration among materials scientists, engineers, chemists, biologists, and physicists working on composites, including nanocomposites. Our aim is to facilitate rapid scientific communication in this field. The journal publishes high-quality research on various aspects of composite materials, including materials design, surface and interface science/engineering, manufacturing, structure control, property design, device fabrication, and other applications. We also welcome simulation and modeling studies that are relevant to composites. Additionally, papers focusing on the relationship between fillers and the matrix are of particular interest. Our scope includes polymer, metal, and ceramic matrices, with a special emphasis on reviews and meta-analyses related to materials selection. We cover a wide range of topics, including transport properties, strategies for controlling interfaces and composition distribution, bottom-up assembly of nanocomposites, highly porous and high-density composites, electronic structure design, materials synergisms, and thermoelectric materials. Advanced Composites and Hybrid Materials follows a rigorous single-blind peer-review process to ensure the quality and integrity of the published work.
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