Nondestructive Testing Technologies of Concrete-Filled Steel Tube

Three testing methods, such as impact-echo, ultrasonic and the acoustic signal were used to detect the structure quality of a large bridge. The inspection and analysis showed that the accuracy of ultrasonic wave testing could be improved by using two or more parameters such as time and frequency; the impact-echo method could inspect the quality probably of concrete-filled steel tube; the sound identification could detect flaws in the concrete-filled steel tube.