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.
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