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Wireless and embedded carbon nanotube networks for damage detection in concrete structures

机译：无线和嵌入式碳纳米管网络，用于混凝土结构中的损伤检测

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摘要

Concrete structures undergo an uncontrollable damage process manifesting in the form of cracks due to the coupling of fatigue loading and environmental effects. In order to achieve long-term durability and performance, continuous health monitoring systems are needed to make critical decisions regarding operation, maintenance and repairs. Recent advances in nanostructured materials such as carbon nanotubes have opened the door for new smart and advanced sensing materials that could effectively be used in health monitoring of structures where wireless and real time sensing could provide information on damage development. In this paper, carbon nanotube networks were embedded into a cement matrix to develop an in situ wireless and embedded sensor for damage detection in concrete structures. By wirelessly measuring the change in the electrical resistance of the carbon nanotube networks, the progress of damage can be detected and monitored. As a proof of concept, wireless cement-carbon nanotube sensors were embedded into concrete beams and subjected to monotonic and cyclic loading to evaluate the effect of damage on their response. Experimental results showed that the wireless response of the embedded nanotube sensors changes due to the formation of cracks during loading. In addition, the nanotube sensors were able to detect the initiation of damage at an early stage of loading.
机译：由于疲劳载荷和环境影响的耦合，混凝土结构遭受不可控制的破坏过程，表现为裂纹形式。为了获得长期的耐用性和性能，需要连续的健康监控系统来做出有关操作，维护和维修的关键决策。纳米结构材料（例如碳纳米管）的最新进展为新型智能和先进的传感材料打开了大门，这些材料可以有效地用于结构的健康监测，其中无线和实时传感可以提供有关损伤​​发展的信息。本文将碳纳米管网络嵌入水泥基体中，以开发用于混凝土结构损伤检测的原位无线和嵌入式传感器。通过无线测量碳纳米管网络电阻的变化，可以检测和监控损坏的进程。作为概念的证明，无线水泥碳纳米管传感器被嵌入混凝土梁中，并承受单调和循环载荷，以评估损伤对其响应的影响。实验结果表明，嵌入式纳米管传感器的无线响应由于加载过程中裂缝的形成而改变。另外，纳米管传感器能够在加载的早期阶段检测到破坏的开始。

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