This paper introduces the present status of non-destructive testing method of concrete, and summarizes the related results. The characteristics of different testing methods are analyzed and the defects of the present researches are pointed out. The results show that traditional NDT methods such as ray inspection and Ultrasonic detection are simple and convenient, while their sensitivity is low. The acoustic emission method has high sensitivity but it is difficult to detect static defects. The acoustic emission method has the characteristics of high sensitivity, while it is difficult to find static defects. The Piezoelectric impedance method can detect the micro damage of concrete. The visual image detection method is easy to show the development of cracks. Each method has its own scope of application. Based on the above analysis results and combined with the characteristics of concrete material, the key problem in the research of NDT methods of concrete damage is discussed.%传统的无损检测方法如射线检测、超声波检测等具有简洁方便等特点但灵敏度不高,声发射方法灵敏度较高却难以检测静态缺陷,压电阻抗法能检测混凝土微小损伤;而可视化图像检测法则能较直观地呈现裂缝发展状况,每种方法都有各自的使用条件和适用范围.结合混凝土材料特点,探讨采用无损检测方法在研究混凝土损伤中的关键问题.
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