Effect of industrial multi-walled carbon nanotubes on the mechanical properties and microstructure of ultra-high performance concrete

IF 10.8 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Sijie Deng , Jie Fan , Biliang Yi , Jianfeng Ye , Gengying Li
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Abstract

To enhance the safety and functionality requirements of engineering structures, carbon nanotubes are used to improve the performance of concrete. However, their high cost limits their large-scale application. In this study, industrial multi-walled carbon nanotubes (IMWCNT) were employed to ultra-high performance concrete (UHPC) to achieve a balance between nanomodification and economy. The effects of different IMWCNT contents on the flowability, mechanical properties, and water resistance of UHPC were investigated. Moreover, the hydration products, microstructure, and fiber–matrix interface characteristics of UHPC specimens were analyzed using thermogravimetric analysis and scanning electron microscopy. The incorporation of appropriate amounts of IMWCNTs could effectively improve the mechanical properties and crack resistance of UHPC and partly prevent the infiltration of water into the matrix. Adding 0.1 wt% IMWCNTs resulted in optimal mechanical properties, and the flexural/compressive strengths of fiberless UHPC mortar and fibrous UHPC (2 vol% steel fibers) were increased by 6.7/5.2 % and 8.5/11.3 %, respectively. Microstructural analysis of the samples showed that uniformly dispersed IMWCNTs can enhance cement hydration and bridge the cracks at the microscale and nanoscale. In addition, incorporating an appropriate amount of IMWCNTs in UHPC reduced the porosity of its fiber–matrix interface and optimized steel fiber distribution in the matrix. Cost-benefit analyses results showed that although the addition of IMWCNTs increases the manufacturing cost of fibrous UHPC, their addition in moderate amounts (0.1 wt%) does not adversely affect the economic index due to the improvement in mechanical properties.
工业多壁碳纳米管对超高性能混凝土力学性能和微观结构的影响
为了提高工程结构的安全性和功能性要求,碳纳米管被用来改善混凝土的性能。然而,碳纳米管的高成本限制了其大规模应用。本研究将工业多壁碳纳米管(IMWCNT)应用于超高性能混凝土(UHPC),以实现纳米改性与经济性之间的平衡。研究了不同 IMWCNT 含量对 UHPC 的流动性、力学性能和耐水性的影响。此外,还使用热重分析和扫描电子显微镜分析了 UHPC 试样的水化产物、微观结构和纤维-基质界面特征。结果表明,适量的 IMWCNTs 能有效改善 UHPC 的力学性能和抗裂性,并能在一定程度上防止水分渗入基体。添加 0.1 wt%的 IMWCNTs 可获得最佳力学性能,无纤维超高性能混凝土砂浆和有纤维超高性能混凝土(2 vol.%钢纤维)的抗弯/抗压强度分别提高了 6.7/5.2% 和 8.5/11.3%。样品的微观结构分析表明,均匀分散的 IMWCNTs 可以增强水泥的水化作用,并在微观和纳米尺度上弥合裂缝。此外,在 UHPC 中掺入适量的 IMWCNT 还能降低纤维-基体界面的孔隙率,优化钢纤维在基体中的分布。成本效益分析结果表明,虽然添加 IMWCNTs 会增加纤维状 UHPC 的制造成本,但适量添加(0.1 wt.%)IMWCNTs 并不会因其机械性能的改善而对经济指标产生不利影响。
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来源期刊
Cement & concrete composites
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.
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