Fabrication and properties of 1–3 connectivity epoxy resin modified cement based piezoelectric composite
Tóm tắt
The 1–3 connectivity epoxy resin modified cement based piezoelectric composites were developed to meet the requirement of concrete structural heath monitoring. The piezoelectric ceramic volume fraction on piezoelectric, dielectric and electromechanical coupling properties of the composites were discussed. The results showed that the relative permittivity of the piezoelectric composites increases linearly with increasing the PZT piezoelectric ceramic volume fraction, but the dielectric loss of the piezoelectric composites is a little bit larger than that of the PZT ceramic. The piezoelectric strain constant d33 of the piezoelectric composites is mainly contributed by PZT ceramic and is in proportion to PZT volume fraction, however, the piezoelectric voltage constant
$${g}_{33}$$
show the opposite variation. When PZT volume fraction decreases to 27.7%,
$${g}_{33}$$
value of the piezoelectric composites reaches to 75.0 (mV)·m·N−1. When PZT ceramic volume fraction is 62.33%, the thickness electromechanical coupling coefficient kt of the piezoelectric composites is the largest of 66.73%. The acoustic impedance Z of the piezoelectric composite is close to that of the concrete when PZT ceramic volume fraction is less than 44.44%.
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