混凝土梁无损检测新技术及其进展

介绍了国内外混凝土梁无损检测技术的发展及应用现状。近年来发展起来的混凝土梁无损检测新技术主要可以分为三类：一类是以应力波理论为基础的方法如冲击回波法、表面波频谱分析法、声发射技术以及超声脉冲法等；一类是以探地雷达为代表的利用电磁波的技术；另外一类是以射线作为探测媒介的方法如红外热像法、计算机断层X射线扫描技术等。实践表明，这些技术对提高混凝土梁无损检测的精度与效率具有重要意义。

New Non-Destructive Testing Techniques and Their Evolution of Concrete Beams

The development and application of non-destructiv e testing (NDT) techniques of concrete beams at home and abroad are presented in t his pap er.The first sort of NDT methods is based on the mechanical principle of stress wave propagation,such as impact-echo method,spectral anlysis of surface wave m ethod,acoustic emission technique and ultrasonic pulse method etc.; the second sort is the use of electromagnetic wave propagation techniques of the ground pe netrati ng radar (GPR) as a representive; the final sort of NDT methods is to use the radi ography as the medium of detection,for instance,infrared thermography and computerized tomograp hy etc.In terms of practical experience,these techniques play an important role in increasing the accuracy and speed of NDT investigations.