Carbon nanotubes can be added to cementitious materials to create a multifunctional nanocomposite with excellent piezoresistive and strain-sensing properties. The use of carbon nanotubes provides high strain sensitivity and signal-to-noise ratio, which are ideal for fabricating self-sensing nanocomposite cement paste for applications to structural health monitoring of concrete structures. The authors have recently developed an innovative sensor, the carbon nanotube cement-based sensor (CNTCS), made from a nanocomposite cement paste. This CNTCS is durable because it is fabricated with a material that has a life expectancy similar to the one of the monitored structure, and provides a natural strong mechanical bond with structural concrete. These characteristics enable embedded and spatially distributed sensing. The CNTCS was conceived to conduct vibration-based structural health monitoring.This chapter presents an overview of the sensing properties of cement pastes doped with multiwalled carbon nanotubes. After introducing the topic, including a brief state of the art on multifunctional cement-based materials, the fabrication process of the CNTCSs is discussed. Then, unstrained and strained electrical responses of the nanocomposite sensors are discussed and interpreted in light of a lumped electromechanical circuit model used to characterize both the polarization effects and the sensing capability of the CNTCSs. Finally, a proof-of-concept laboratory application consisting of vibration monitoring and modal identification of a full-scale concrete beam is presented, where outputs of CNTCSs are benchmarked against mature off-the-shelf sensing technologies.

Smart Cement Paste with Carbon Nanotubes

UBERTINI, Filippo;D'ALESSANDRO, ANTONELLA
2016

Abstract

Carbon nanotubes can be added to cementitious materials to create a multifunctional nanocomposite with excellent piezoresistive and strain-sensing properties. The use of carbon nanotubes provides high strain sensitivity and signal-to-noise ratio, which are ideal for fabricating self-sensing nanocomposite cement paste for applications to structural health monitoring of concrete structures. The authors have recently developed an innovative sensor, the carbon nanotube cement-based sensor (CNTCS), made from a nanocomposite cement paste. This CNTCS is durable because it is fabricated with a material that has a life expectancy similar to the one of the monitored structure, and provides a natural strong mechanical bond with structural concrete. These characteristics enable embedded and spatially distributed sensing. The CNTCS was conceived to conduct vibration-based structural health monitoring.This chapter presents an overview of the sensing properties of cement pastes doped with multiwalled carbon nanotubes. After introducing the topic, including a brief state of the art on multifunctional cement-based materials, the fabrication process of the CNTCSs is discussed. Then, unstrained and strained electrical responses of the nanocomposite sensors are discussed and interpreted in light of a lumped electromechanical circuit model used to characterize both the polarization effects and the sensing capability of the CNTCSs. Finally, a proof-of-concept laboratory application consisting of vibration monitoring and modal identification of a full-scale concrete beam is presented, where outputs of CNTCSs are benchmarked against mature off-the-shelf sensing technologies.
2016
9781782423447
9781782423447
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11391/1387098
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