Journal or Book Title
Structural Health Monitoring
This work focuses on the analysis of a new nanocomposite cement-based sensor (carbon nanotube cement-based sensor), for applications in vibration-based structural health monitoring of civil engineering structures. The sensor is constituted of a cement paste doped with multi-walled carbon nanotubes, so that mechanical deformations produce a measurable change of the electrical resistance. Prior work of some of the authors has addressed the fabrication process, dynamic behaviour and implementation to full-scale structural components. Here, we investigate the effectiveness of a linear lumped-circuit electromechanical model, in which dynamic sensing is associated with a strain-dependent modulation of the internal resistance. Salient circuit parameters are identified from a series of experiments where the distance between the electrodes is parametrically varied. Experimental results indicate that the lumped-circuit model is capable of accurately predicting the step response to a voltage input and its steady-state response to a harmonic uniaxial deformation. Importantly, the model is successful in anticipating the presence of a superharmonic component in sensor’s output.
Research Focus Area
Construction Engineering and Management, Environmental/Water Resources Engineering, Geotechnical/Materials Engineering, Structural Engineering
D'Alessandro, Antonella; Ubertini, Filippo; Materazzi, Annibale L.; Laflamme, Simon; and Porfiri, Maurizio, "Electromechanical modelling of a new class of nanocomposite cement-based sensors for structural health monitoring" (2014). Civil, Construction and Environmental Engineering Publications. 72.