Abstract
Steel bars, which are commonly used as reinforcements in concrete structures, are slender rods and are good conduits for stress wave propagation. In this paper, a lead zirconate titanate (PZT)-based steel bar corrosion monitoring approach was proposed. Two PZT transducers are surface-bonded on the two ends of a steel rod, respectively. One works as actuator to generate stress waves, and the other functions as a sensor to detect the propagated stress waves. Time reverse technology was applied in this research to monitor the corrosion of the steel bars with a high signal to noise ratio (SNR). Accelerated corrosion experiments of steel bars were conducted. The anti-corrosion performance of the protected piezoceramic transducers was tested first, and then they were used to monitor the corrosion of the steel bar using the time reversal method. The degree of corrosion in the steel bar was determined by the ratio of mass loss during the experiment. The experimental results show that the peak values of the signal that were obtained by time reversal operation are linearly related to the degree of corrosion of the steel bar, which demonstrates the feasibility of the proposed approach for monitoring the corrosion of steel bars using the time reversal method enabled by piezoceramic transducers.
Highlights
Steel bars are widely used as reinforcements for concrete structures in civil engineering [1,2]. the use of non-metal bars in concrete is receiving more and more attention [3,4], steel bars are still the most commonly used in concrete structures
Hong et al [31] proposed an active sensing method to monitor the degree of looseness of a pipeline tapered thread connection, which used piezoceramic transducers based on time reversal, and demonstrated it to be more robust in rejecting noise in Structural health monitoring (SHM) applications
This study proposed a corrosion detection method of steel bars based on piezoceramic transducer enabled time reversal in a controlled laboratory environment
Summary
Steel bars are widely used as reinforcements for concrete structures in civil engineering [1,2]. Miller et al [23] proposed a corrosion monitoring method of steel bars in an RC structure based on the time of arrival changes. Mustapha et al [29] used a method to detect corrosion damage in reinforced concrete beams, which is based on the time reversal of the guided waves. Hong et al [31] proposed an active sensing method to monitor the degree of looseness of a pipeline tapered thread connection, which used piezoceramic transducers based on time reversal, and demonstrated it to be more robust in rejecting noise in SHM applications. To with monitor the corrosion of steel bars, paper proposes a new approachtest that is simple to was transducers epoxy resin protection werethis investigated.
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