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Effect of Aged Binder on Piezoelectric Properties of Cement-Based Piezoelectric Composites

Huang Hsing Pan (Kaohsiung U. of App. Sciences)

Prager Medal Symposium in honor of George Weng: Micromechanics, Composites and Multifunctional Materials

Tue 10:45 - 12:15

MacMillan 117

For the applications of sensors and actuators in civil engineering structure, cement-based piezoelectric composites developed to overcome the matching problem in concrete structures that conventional piezoelectric ceramics or polymers do not contact synchronously with concrete. Cement-based piezoelectric composites consisting of cement matrix and piezoelectric inclusions contain piezoelectric effect after the process of polarization is applied. Although mechanical properties of cement-based piezoelectric composites are aged-dependent, some piezoelectric properties may be not. In this study, four aged-dependent cement binders, as the matrix, including cement, silica fume (SF), blast furnace slag (SL) and fly ash (FA) are investigated to find piezoelectric properties of the composites. Piezoelectric inclusions (lead zirconate titanate, PZT) with volume fraction from 20% to 50% were used. Specimens were made by applying a 80MPa compression to form disk-like shapes, and applied to three poling voltages when material age reaches 7, 28 and 56 days respectively. After the polarization, piezoelectric properties were measured until 60 days. Piezoelectric properties include piezoelectric strain constant, piezoelectric voltage constant, electric capacity, electromechanical coupling coefficient, mechanical quality factor, dielectric constant, and resistance. Experimental results show the age-dependent piezoelectric properties when the polarization is applied at different material ages.