Concrete-structure-quality evaluating method based on ultrasonic CT

Abstract

The invention relates to a concrete-structure-quality evaluating method based on ultrasonic CT.The concrete-structure-quality evaluating method includes the steps that on the basis of a traditional method for detecting concrete defects with an ultrasonic method, two quantizable sound parameters of the complex frequency difference and the cross correlation coefficient are added besides the sound speed and the wave amplitude of a head wave, measuring values of the sound parameters are processed into sound parameter judgment factors, the sound parameter judgment factors are processed into a normalized comprehensive sound parameter judgment factor, and the reliability of the judgment factor is evaluated on the basis; a position measuring chromatogram is drawn according to the comprehensive judgment factor, and the position and the range of suspicious defects are determined according to red confluent areas in the chromatogram.According to the concrete-structure-quality evaluating method, as the step of evaluating the judgment result is additionally set, the accuracy of quality evaluation is greatly improved, and construction safety and personal safety are guaranteed.

Description

technical field [0001] The invention relates to a method for evaluating the quality of concrete structures by using ultrasonic CT, in particular, an evaluation method for detecting the internal compactness of concrete structures by using ultrasonic methods. Background technique [0002] The use of ultrasound to evaluate the compactness of concrete has a history of 20 to 30 years in our country. Up to now, it has been relatively well developed. In the past 20 to 30 years, this technology has gradually developed in our country. played an important role in. The principle of ultrasonic detection of concrete defects is that when the composition of concrete materials, process conditions, internal quality and test distance are constant, there is generally no significant difference in the acoustic parameters such as ultrasonic sound velocity and first wave amplitude at each measuring point. When there are defects such as holes, non-compacting or cracks, the sound time of the ultras...

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Problems solved by technology

[0005] In order to overcome the above-mentioned defects, the inventor has finally determined a range of test results that can reach an accuracy rate of more than 90% through a large number of studies and experiments, and through repeated comparisons and verifications, that is, an ultrasonic method is provided to detect the lack of compactness inside the joints of concrete structures. The method of judging permanent defects has better improved the accuracy and reliability of ultrasonic defect detection inside nodes. After thousands of experiments by the inventor in the laboratory and engineering practice, the correct rate can be guaranteed to be above 90%. good effect

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