Influence of cement matrix on properties of 1–3–2 connectivity cement-based piezoelectric composite

Abstract

In order to develop cement-based piezoelectric intelligent composites suitable for concrete structural health monitoring, 1–3–2 type piezoelectric composites were fabricated by using piezoelectric ceramic as the functional component and epoxy resin and different kinds of cement as the matrix. The properties of the composites were studied. The results show that, compared with pure piezoelectric ceramic, the relative dielectric factor ε33 of the composite decreased while the dielectric loss tan δ33 increased. The planar electromechanical coupling coefficient Kp, mechanical quality factor Qm and acoustic impedance Z of all the composites decreased, while the thickness electromechanical coupling coefficient Kt increased. The composite with ordinary Portland cement matrix had the largest values of ε33, tan δ33, Kt and d33 (piezoelectric strain factor).