| With the acceleration of urbanization and infrastructure construction in China.This paper summarizes the methods and characteristics of various non-destructive testing technologies at home and abroad,the development of the situation and the existing problems.Explain the advantages of various new technologies and methods at home and abroad and their practical application.In order to conduct a non-destructive testing of concrete defects.Concrete specimens with defects were fabricated,and ultrasonic and vibration rebound methods were used to detect cracks on the concrete surface and internal uncompacted areas and voids,as well as defects such as inconsistencies in the joint layer.Relevant conclusions are obtained through data comparison.Ultrasonic non-destructive testing of precast concrete components is carried out.The amplitude parameters of ultrasonic waves are most sensitive to defects(cracks)in concrete components.When the faults are good and the test conditions are basically the same,the large attenuation of amplitude values can be used as the main fault for judging the defects of concrete members.in accordance with.Ultrasonic speed parameters are sensitive to small cracks.Large defects will cause significant velocity drop.Frequency parameters are used to detect small defects in concrete components.Ultrasonic testing of concrete component defects,velocity changes and frequency changes can only be used as a reference.factor.Ultrasonic waves pass through cracks and non-cracks,and the waveforms are significantly different.After passing through the cracks,large-period wave trains sometimes appear,which can be used as an important basis for judging defects.Comprehensive analysis of changes in the parameters of ultrasonic kinematics and kinetics can improve the accuracy of detection.During the testing process,the test results are affected by many aspects.The various factors that may affect the results are summarized.Figure 32;Table25;Reference42... |
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