Electrical and piezoresistive properties of ultra-high toughness cementitious composite incorporating multi-walled carbon nanotubes: Testing, analyzing, and phenomenological modeling

IF 10.8 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Chaokun Hong, Qinghua Li, Zhibin Zhuang, Hongwei Xie, Shilang Xu
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Abstract

This study explores the electrical and piezoresistive properties of ultra-high toughness cementitious composites (UHTCC) enhanced with multi-walled carbon nanotubes (MWCNTs) ranging from 0 to 1 wt% of cementitious binders. The observed polarization behavior is found to be analogous to the charging process of a capacitor. The polarization process and resistivity drift over time in the piezoresistive response are explained using an existing equivalent electrical circuit model incorporating a capacitor. The average results of electrical conductivity initially decrease and subsequently increase with higher MWCNTs concentrations, a phenomenon attributed to increased porosity and reduced matrix conductivity. The percolation threshold is identified at a volume fraction of 0.00387. Notably, even in the absence of MWCNTs, UHTCC materials exhibit piezoresistive properties due to the presence of metal impurities and ionic compounds. The insufficient polarization process results in an increasing trend in fractional change in resistance (FCR). The highest FCR sensitivity to external load occurs within the percolation threshold. Additionally, three equations are proposed to calculate electrical conductivity, incorporating the effects of interfaces, porosity, and matrix conductivity reduction, which align well with the experimental findings. These insights contribute to a deeper understanding of the electrical properties of UHTCC-MWCNTs composites, enabling more precise conductivity measurements and improved sensor sensitivity.

含有多壁碳纳米管的超高韧性水泥基复合材料的电性能和压阻性能:测试、分析和现象建模
本研究探讨了使用多壁碳纳米管(MWCNTs)增强的超高韧性水泥基复合材料(UHTCC)的电学和压阻特性,其水泥基粘结剂的含量从 0 wt% 到 1 wt% 不等。观察到的极化行为类似于电容器的充电过程。压阻响应中的极化过程和电阻率随时间的漂移可以用现有的包含电容器的等效电路模型来解释。随着 MWCNTs 浓度的增加,电导率的平均结果最初会降低,随后会升高,这一现象归因于孔隙率的增加和基体电导率的降低。渗流阈值确定为 0.00387 体积分数。值得注意的是,即使没有 MWCNTs,UHTCC 材料也会因金属杂质和离子化合物的存在而表现出压阻特性。极化过程不足导致电阻分数变化(FCR)呈上升趋势。FCR 对外部负载的最高敏感度出现在渗滤阈值范围内。此外,还提出了三种计算导电率的方程,其中包含界面、孔隙率和基质导电率降低的影响,与实验结果非常吻合。这些见解有助于加深对 UHTCC-MWCNTs 复合材料电特性的理解,从而实现更精确的电导率测量和更高的传感器灵敏度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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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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