Synergistic effect of nickel and graphite powders on the thermoelectric properties of ultra-high-performance concrete containing steel fibers and MWCNTs

IF 10.8 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Cement & concrete composites Pub Date : 2024-09-30 DOI:10.1016/j.cemconcomp.2024.105778
Rongzhen Piao , Zhengri Cui , Taekgeun Oh , Soonho Kim , Jae-Weon Jeong , Doo-Yeol Yoo
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Abstract

The study investigates the influence of multi-walled carbon nanotubes (MWCNTs) and conductive powders, namely nickel powder (NP) and graphite powder (GP), on the mechanical and thermoelectric properties of ultra-high-performance concrete (UHPC). Flowability tests indicate that the addition of MWCNTs and conductive powders affects the flow diameter, with higher concentrations resulting in decreased flowability. Thermalgravimetric analysis and Fourier transform infrared spectroscopy reveal that the enhancement of the hydration reaction by 0.1 % MWCNTs in UHPC reaches saturation at this concentration. Pore structure analysis demonstrates a reduction in porosity and a denser structure upon the addition of 0.1 % MWCNTs. Mechanical tests indicate that the incorporation of 0.1 % MWCNTs enhances compressive and tensile strengths, whereas the introduction of 0.3 % MWCNTs diminishes the mechanical performance. Moreover, the electrical conductivity and thermoelectric effect are enhanced with the addition of MWCNTs and conductive powders. However, a decline in thermoelectric effect is observed when 0.3 % MWCNTs are added, although the conductivity remained high. The optimal thermoelectric performance is achieved with the combination of 0.3 % MWCNTs and 5 % NP, yielding a maximum power factor (PF) of 2148.2 μW/m·K2 and a figure of merit (ZT) of 4.9 × 10⁻7.
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镍粉和石墨粉对含有钢纤维和 MWCNTs 的超高性能混凝土热电性能的协同效应
本研究调查了多壁碳纳米管(MWCNTs)和导电粉末(即镍粉(NP)和石墨粉(GP))对超高性能混凝土(UHPC)的机械和热电性能的影响。流动性测试表明,添加 MWCNTs 和导电粉末会影响流动直径,浓度越高,流动性越差。热重分析和傅里叶变换红外光谱分析显示,在 UHPC 中添加 0.1 % 的 MWCNT 可使水化反应达到饱和。孔隙结构分析表明,添加 0.1 % 的 MWCNT 后,孔隙率降低,结构更加致密。机械测试表明,添加 0.1 % MWCNTs 可提高抗压和抗拉强度,而添加 0.3 % MWCNTs 则会降低机械性能。此外,添加 MWCNTs 和导电粉后,导电性和热电效应也得到了增强。然而,当添加 0.3 % 的 MWCNT 时,虽然导电率仍然很高,但热电效应却有所下降。0.3 % MWCNTs 和 5 % NP 的组合实现了最佳热电性能,最大功率因数 (PF) 为 2148.2 μW/m-K2,优点系数 (ZT) 为 4.9 × 10-7。
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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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