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对混凝土构件进行超声无损检测,超声波的振幅参数对混凝土构件中的缺陷(裂缝)最敏感,在耦合良好和测试条件基本一致时,振幅值的大幅衰减可作为判断混凝土构件存在缺陷的主要依据。超声波的速度参数对微小裂隙不敏感,缺陷较大会引起速度值的显著下降;频率参数用于检测混凝土构件缺陷不够敏感;对混凝土构件缺陷进行超声检测,速度变化和频率变化只能作为参考因素。超声波通过裂缝与未过裂缝,波形存在明显差异,通过裂缝后,有时会出现很大周期的波列,可作为判断缺陷的重要依据。综合分析超声波运动学和动力学各参数的变化,能够提高检测的准确性。
Ultrasonic non-destructive testing of concrete components, the ultrasonic parameters of the amplitude of the concrete components of the cracks (cracks) the most sensitive, the coupling is good and the test conditions are basically the same, the amplitude of the sharp decay can be used to determine the main basis for the existence of defects in concrete components. Ultrasonic velocity parameters are not sensitive to tiny cracks, large defects will cause a significant decrease in velocity values; frequency parameters used to detect concrete component defects are not sensitive enough; ultrasonic testing of concrete component defects, speed changes and frequency changes can only be used as a reference factor. Ultrasonic wave through the crack and not crack, the waveform there is a clear difference, after the crack, and sometimes there will be a large period of wave train, can be used as an important basis for judging defects. A comprehensive analysis of the changes of the parameters of ultrasonic kinetics and dynamics can improve the accuracy of the detection.