A, structural concrete nondestructive testing conditions:
Lack of specimens with the same conditions or insufficient number of standard specimens; The quality of specimens is not representative; The compressive test of the specimen does not meet the standard; There are doubts about the test results of compressive strength of specimens; Concrete quality problems caused by inferior materials and construction.
Second, the structural concrete detection methods and characteristics:
(1) ultrasonic method: the performance of materials and structures will not be damaged during the inspection process; Directly detect the structure and infer its actual strength and defect nature; It is convenient to repeat and recheck the inspection, and the inspection results can be repeated.
(2) Rebound method: simple but discrete.
(3) Ultrasonic rebound synthesis method: it can reduce the influence of various factors on the results, make up for the shortcomings of the two methods, and the test accuracy is high.
(4) Core drilling method: the test results are intuitive and accurate, and the strength and thickness can be detected, but the operation is complicated and the damage to concrete is slight.
(V) Pull-out method: The test results are intuitive and accurate, but the operation is complicated, with slight damage to concrete and discrete results.
(VI) Transient excitation (knocking) time domain and frequency domain analysis method (small strain method): it is suitable for foundation pile detection, with simple operation, rapid detection and more accurate results.
(7) Ground penetrating radar method: it is mainly used for large-area concrete quality detection, such as tunnel lining concrete detection, which is characterized by fast detection speed, large detection thickness and accurate results.
The content of "nondestructive testing method for concrete structural members" is introduced. Welcome to Zhong Da for more information.
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