Investigation on a Kind of Embedded AE Sensor for Concrete Health Monitoring

A kind of embedded acoustic emission (AE) sensor for the concrete health monitoring was fabricated by using the 1-3 polymer=cement-based piezoelectric composite. The frequency bandwidth, sensitivity, threshold value, and response of the sensor were investigated. The results show that the embedded acoustic emission sensor has broad frequency bandwidth and low threshold value, and is very sensitive to crack propagation of the cement mortar in the loading test. Moreover, there is a good relationship between AE signals and the damage process of the cement mortar. The embedded acoustic emission sensor can be used to detect and collect the AE signals in different fracture stages, and make accurate judgments on the damage condition of the cement mortar. So, the embedded acoustic emission sensor is suitable for the concrete health monitoring.

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