Corrosion Investigation of Reinforced Concrete Based on Piezoelectric Smart Materials
Hunan Provincial Key Laboratory of Structures for Wind Resistance and Vibration Control & School of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, China
School of Civil Engineering, Central South University of Forestry and Technology, Changsha 410075, China
School of Civil Engineering, Central South University, Changsha 410075, China
Shandong Provincial Key Laboratory of Construction Materials Preparation and Measurement, University of Jinan, Jinan 250022, China
Author to whom correspondence should be addressed.
Materials 2019, 12(3), 519; https://doi.org/10.3390/ma12030519
Received: 12 January 2019 / Revised: 30 January 2019 / Accepted: 31 January 2019 / Published: 9 February 2019
(This article belongs to the Special Issue Corrosion of Reinforcing Steel in Reinforced Concrete)
An embedded piezoelectric transducer was developed for monitoring the corrosion process of reinforcement bars in concrete based on the piezoelectric impedance technique. The electrochemical method was employed to accelerate the corrosion process of the reinforcement bar with relative mass loss of 0.5–10%, and the resistance spectra of the piezoelectric transducers were investigated to assess the corrosion process. The results show that the corrosion process of the reinforcement bar has significant influence on the resistance spectra of the piezoelectric transducers. Statistical parameters were used to intuitively evaluate the corrosion evolution based on variations of the resistance spectra. The corrosion process of reinforcement bar in concrete can be classified into three periods; that is, the initial period when the relative mass loss is less than 2%, the developing period at a relative mass loss of 2–4%, and the rapid corrosion period when the relative mass loss is higher than 4%.