INFLUENCE OF POZZOLANIC MATERIALS ON 0-3 CEMENT-BASED PIEZOELECTRIC COMPOSITES

摘要

In this study, piezoelectric properties of 0-3 type cement-based piezoelectric composite affected by pozzolanic materials are investigated, where the piezoelectric inclusion is PZT and the cement-based matrix includes 50% cement, or a mixture of 40% cement and 10% pozzolanic materials in volume. Three pozzolanic materials containing silica fume, blast furnace slag and F grade fly ash were selected. The cement-based piezoelectric composites were made by applying 80MPa to form disk-like shapes. Experimental results show that the piezoelectric properties of the composites reach a plateau behavior after the 14th day of the polarization. The piezoelectric composite with fly ash always has the shortest trigger time of polarization, the specimen with blast furnace slag is the second, and the silica fume composite takes the longest trigger time. The silica fume specimen owns higher dielectric properties and denser structures which enhance piezoelectric strain constant d_(33) values up to 34.43 pC/N if the polarization is completed. The cement-based piezoelectric composites containing blast furnace slag also can increase the piezoelectric strain constant, but this did not achieve for the composites with fly ash. The value of piezoelectric voltage constant g_(33) for the cement-based piezoelectric composites adding fly ash is 23.7 mV-m/N, near PZT piezoelectric ceramics. Meanwhile, cement-based composites containing pozzolanic materials do not raise the electro-mechanical coupling factor.