Displacement Investigation of KNN-Bitumen-Based Piezoceramics in Asphalt Concrete

作者:Tang, Ning; Yang, Kaikai; Pan, Wenhao; Wu, Limei; Wang, Qing*; Chen, Yanwen
来源:Advances in Materials Science and Engineering, 2018, 2018: 1924753.
DOI:10.1155/2018/1924753

摘要

Piezoelectric material has excellent characteristics of electromechanical coupling so that it could be widely applied in structural health monitoring 4 eld. Nondestructive testing of piezoelectric technique becomes a research focus on piezoelectric 4 eld. Asphalt concrete produces cumulative damage under the multiple repeated vehicle load and natural situation, so it is suited material and structure for nondestructive application. In this study, a test system was established by driving power of piezoceramic, laser displacement sensor, computer, and piezo-embedded asphalt concrete. Displacement, hysteresis, creeps, and dynamic behavior of KNN piezoceramic element embedded in asphalt concrete were tested. The results indicate that displacement output attained 0.4 mu m to 0.7 mu m when the loads were from 0 N to 150 N. The hysteresis was not obvious when the load was from 0 N to 100 N, aside from higher loads. The creep phenomenon can be divided into two parts: uptrend and balance. The more serious the asphalt binder ageing is, the larger the displacement is, when piezo-asphalt concrete has already been in serious ageing.

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