Journal
CEMENT & CONCRETE COMPOSITES
Volume 121, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.cemconcomp.2021.104089
Keywords
Cement-based composites; Ni-CNTs; Electrical resistivity; Piezoresistive property; Magnetic field
Funding
- Natural Science Foundation of China [52079048, 51478164]
- Natural Science Foundation of Jiangsu Province [BK20181306]
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A novel cement-based composite containing nickel-coated carbon nanotubes (NiCNTs) was fabricated using magnetic field induction for piezoresistive sensor in structural health monitoring system. The oriented Ni-CNTs cement-based composites showed anisotropic conductivity and piezoresistive properties, with the best performance observed in composites aligned parallel to the magnetic field direction.
A novel type of cement-based composite with preferentially orientated nickel-coated carbon nanotubes (NiCNTs) was fabricated by induction of magnetic field (MF) method for piezoresistive sensor in structural health monitoring system. The microstructures of Ni-CNTs and their aligned features in the as-fabricated composites were observed by scanning electron microscope (SEM), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD), respectively. The four-electrode method was applied to measure the conductivity and piezoresistive properties of as-fabricated composites. Besides, the effects of several influencing factors, including Ni-CNTs orientation and content, loading rate on the conductivity and piezoresistive properties of Ni-CNTs cement-based composites were determined. The results indicate that the CNTs coated with crystalline nickel are orientated preferentially along the MF direction, of which the orientation angles are concentrated between - 30 degrees;-20 degrees, presenting a Gaussian distribution. The conductivity and piezoresistive properties of oriented Ni-CNTs cement-based composites are anisotropic. The electrical resistivity and percolation threshold of composites have a sequence: perpendicular to MF > without MF > parallel to MF. Under cyclic compressive loading, Ni-CNTs cement-based composites parallel to MF direction exhibit the best piezoresistive properties. The optimum content level of CNT for the piezoresistivity is 1.20 vol%, which is slightly higher than the percolation threshold. Also, the strain sensitivity of composites parallel to MF is most sensitive to the loading rate.
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