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首页> 外文期刊>Proceedings of the IEEE >Multifunctional Cement Composites Enhanced With Carbon Nanotube Thin Film Interfaces
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Multifunctional Cement Composites Enhanced With Carbon Nanotube Thin Film Interfaces

机译：碳纳米管薄膜界面增强的多功能水泥复合材料

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摘要

Concrete and other cementitious composites used in civil infrastructure are prone to many forms of damage. For example, cracks could occur and propagate to cause catastrophic component or system-level failure. Therefore, the objective of this study was to nano-engineer a self-sensing cementitious composite that could detect and locate damage. Integration of multi-walled carbon nanotubes (MWNTs) in the mortar mix design and during casting enhanced the electromechanical or sensing properties of the cementitious composites. Instead of directly dispersing MWNTs in the cement matrix, the cement-particle interface was modified using spray-coated MWNT-latex thin films deposited directly onto dry sand particles prior to mortar casting. This procedure preserved MWNT dispersions within the thin film architecture, used minimal amounts of MWNTs, was scalable, and provided dramatic sensing performance enhancements. The mechanical and electromechanical properties of mortar specimens were characterized using compressive cyclic load tests. Furthermore, an electrical resistance tomography (ERT) algorithm was used for mapping mortar specimens' spatial resistance distributions. Since their resistance was precalibrated to strain, localized changes in calculated resistance indicated damage. Spatial damage detection was validated by drilling holes in various locations in cementitious composite plates and then by mapping resistance distributions using ERT.
机译：用于民用基础设施的混凝土和其他水泥复合材料易于遭受多种形式的破坏。例如，裂纹可能发生并传播，从而导致灾难性的组件或系统级故障。因此，本研究的目的是对能够检测和定位损伤的自感应胶结复合材料进行纳米工程处理。在砂浆混合料设计中和浇铸过程中集成多壁碳纳米管（MWNT）增强了水泥基复合材料的机电或感测性能。代替直接将MWNTs分散在水泥基体中，在砂浆浇铸之前，使用直接沉积在干砂颗粒上的喷涂MWNT-乳胶薄膜对水泥-颗粒界面进行改性。此过程将MWNT分散液保留在薄膜体系结构中，使用最少的MWNT，具有可扩展性，并显着增强了感测性能。砂浆试样的机械和机电性能用压缩循环载荷试验表征。此外，电阻层析成像（ERT）算法用于绘制砂浆样本的空间电阻分布图。由于其电阻已预先校准为应变，因此计算出的电阻的局部变化表明已损坏。通过在胶结复合材料板的不同位置钻孔，然后使用ERT绘制电阻分布图，可以验证空间损伤的检测能力。

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