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Advances in Materials Science and Engineering
Volume 2018, Article ID 1924753, 7 pages
https://doi.org/10.1155/2018/1924753
Research Article

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

1School of Materials Science and Engineering, Shenyang Jianzhu University, Shenyang, China
2School of Materials Science and Engineering, Northeast University, Shenyang, China

Correspondence should be addressed to Qing Wang; moc.621@yxmgniqgnaw

Received 8 November 2017; Accepted 9 January 2018; Published 28 February 2018

Academic Editor: Fabrizio Pirri

Copyright © 2018 Ning Tang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Piezoelectric material has excellent characteristics of electromechanical coupling so that it could be widely applied in structural health monitoring field. Nondestructive testing of piezoelectric technique becomes a research focus on piezoelectric field. 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 μm to 0.7 μm 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.