Ultrasonic monitoring sensor for corrosion of steel bar in concrete and application method of sensor

Abstract

The invention relates to an ultrasonic monitoring sensor for the corrosion of a steel bar in concrete. The ultrasonic monitoring sensor is characterized by being provided with a steel bar (1), wherein a piezoelectric ceramic column (2) for transmitting is arranged at one end of the steel bar (1) and is used for transmitting ultrasonic waves; a piezoelectric ceramic column (3) for receiving is arranged at the other end of the steel bar (1) and is used for receiving the ultrasonic waves; the axial directions of the piezoelectric ceramic column (2) and the piezoelectric ceramic column (3) are the same as the axial direction of the steel bar; the piezoelectric ceramic column (2) for transmitting and the piezoelectric ceramic column (3) for receiving are provided with a shielding lead wire (4) for transmitting and a shielding lead wire (5) for receiving, respectively; the shielding lead wire (4) for transmitting and the shielding lead wire (5) for receiving are externally provided with a resin insulating layer (6) and a shielding layer (7), respectively; in the use process, the sensor is buried into the concrete during construction; the shielding lead wire (4) for transmitting is connected with a signal generator (8) to generate the ultrasonic waves and the shielding lead wire (5) for receiving is connected with a signal receiver (9) to receive the ultrasonic waves; the corrosion condition of the steel bar in the concrete (10) is monitored according to the change of received ultrasonic wave signals.

Description

technical field [0001] The invention relates to a monitoring device and a monitoring method for steel bar corrosion in concrete, in particular to an ultrasonic monitoring sensor for steel bar corrosion in concrete and its usage. Background technique [0002] A large number of engineering practices have shown that in reinforced concrete structures, steel corrosion is the main factor affecting the durability of in-service structures. The corrosion of steel bars will reduce the cross-sectional area of ​​the stressed steel bars, reduce the bonding force between steel bars and concrete, crack the concrete cover, and reduce the structural strength, etc., thereby reducing the durability of the structure, the resistance of the structure decays with time, and the reliability is also reduced. Correspondingly, there are great hidden dangers in the usability and safety of concrete structures. With the continuous development of my country's social economy, various large and complex engi...

AI Technical Summary

Problems solved by technology

Acoustic emission method requires continuous monitoring and is susceptible to environmental noise interference

The ultrasonic method is an active monitoring method. The ultrasonic probe is used to transmit and receive ultrasonic waves to scan the concrete where the steel bars are located. Although the detection is simple and convenient, the accuracy of monitoring steel bar corrosion is not high. For the detection results when no obvious rust swelling cracks occur Not accurate enough

Each of the above monitoring methods has its advantages and limitations.

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