Abstract: A cement based piezoelect ric composite sensor was fabricated using the 123 cement based piezoelect ric
composite as a sensing element . The f requency response , linearity and sensing properties of the sensor were investi2 gated. The result s indicate that the output voltage amplitude of the sensor increase with increasing f requency of load under 5 Hz. When the f requency of load is larger than about 5 Hz , the output voltage amplitude of the sensor is nearly independent of f requency. There exist s an obviously linear relationship between the output voltage amplitude and input load amplitude of the sensor . The 12 3 cement based piezoelect ric composite sensor embedded into the concrete st ructure exhibit s excellent sensing properties. The output voltages of the sensor are correspondent to the complex load , random load and pulse load very well . The phase difference between the output voltage and input load is near zero. The experimental output voltage value of the sensor is in good agreement with the theoretical value.Such sensor has a good potential to be used in civil engineering st ructural health monitoring.