A Reusable PZT Transducer for Monitoring Initial Hydration and Structural Health of Concrete

Sensors

Yaowen Yang¹  Bahador Sabet Divsholi² 

[1] School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore;

关键词: electromechanical impedance (EMI);    structural health monitoring (SHM);    PZT;    hydration;    concrete;    reusable;   

DOI  :  10.3390/s100505193

来源: mdpi

【 摘 要 】

During the construction of a concrete structure, strength monitoring is important to ensure the safety of both personnel and the structure. Furthermore, to increase the efficiency of in situ casting or precast of concrete, determining the optimal time of demolding is important for concrete suppliers. Surface bonded lead zirconate titanate (PZT) transducers have been used for damage detection and parameter identification for various engineering structures over the last two decades. In this work, a reusable PZT transducer setup for monitoring initial hydration of concrete and structural health is developed, where a piece of PZT is bonded to an enclosure with two bolts tightened inside the holes drilled in the enclosure. An impedance analyzer is used to acquire the admittance signatures of the PZT. Root mean square deviation (RMSD) is employed to associate the change in concrete strength with changes in the PZT admittance signatures. The results show that the reusable setup is able to effectively monitor the initial hydration of concrete and the structural health. It can also be detached from the concrete for future re-use.

【 授权许可】

CC BY   
© 2010 by the authors; licensee MDPI, Basel, Switzerland.