Abstract
By employing ordinary Portland cement as a matrix and PZT-5H piezoelectric ceramic as the functional body, 1-3 and 2-2 cement-based piezoelectric composites were prepared. Quasi-static compression tests were performed along with dynamic impact loading tests to study the electro-mechanical response characteristics of 1-3 and 2-2 cement-based piezoelectric composites. The research results show that both composites exhibit strain rate effects under quasi-static compression and dynamic impact loading since they are strain-rate sensitive materials. The sensitivity of the two composites has a non-linear mutation point: in the quasi-static state, the sensitivity of 1-3 and 2-2 composites is 157 and 169 pC/N, respectively; in the dynamic state, the respective sensitivity is 323 and 296 pC/N. Although the sensitivity difference is not significant, the linear range of the 2-2 composite is 24.8% and 61.3% larger than that of the 1-3 composite under quasi-static compression and dynamic impact loading, respectively. Accordingly, the 2-2 composite exhibits certain advantages as a sensor material, irrespective of whether it is subjected to quasi-static or dynamic loading.
Highlights
Concrete structures have become omnipresent in our lives
The P.II 42.5 Portland cement paste with a water-cement ratio of 0.32 was used as the matrix, while PZT-5H piezoelectric ceramics were employed as the functional body and epoxy resin was applied to reinforce the interface bonding
Type 1-3 is a two-phase piezoelectric composite comprising a one-dimensional piezoelectric ceramic column arranged in a threedimensional connected cement matrix
Summary
Concrete structures have become omnipresent in our lives During their service life, the combined action of environment and loads lead to easy damage in concrete structure [1,2,3], they are subjected to quasi-static loads, and to various dynamic loads. Current piezoelectric smart materials exhibit several shortcomings, such as high costs, poor compatibility, and poor durability, which limit their applicability [5,8,9,10]. The incompatibility of their mechanical properties with those of embedded pressure sensors and matrixes tend to facilitate internal cracks
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