Concrete strength detection method based on ultrasonic surface wave frequency dispersion curve

Abstract

The invention provides a concrete strength detection method based on an ultrasonic surface wave frequency dispersion curve, which comprises the following steps of carrying out ultrasonic detection ona concrete member to obtain an ultrasonic surface wave seismic record of the concrete member, performing data transformation processing on the ultrasonic surface wave seismic record to obtain a phasevelocity frequency dispersion curve of the ultrasonic surface wave seismic record, layering the concrete member according to the fluctuation condition of the phase velocity frequency dispersion curve,calculating the average surface wave phase velocity of each layer of the concrete member, and calculating the concrete strength of each layer of the concrete member according to the average surface wave phase velocity, and evaluating the overall strength of the concrete member according to the concrete strength of each layer of the concrete member.

Description

technical field [0001] The invention relates to concrete strength detection technology, in particular to a concrete strength detection method based on ultrasonic surface wave dispersion curve. Background technique [0002] In recent years, my country has vigorously carried out infrastructure construction, among which concrete components are important materials for construction. In order to ensure the quality of the project, non-destructive testing is very important in the strength testing of concrete members. At present, there are many non-destructive testing methods for concrete strength, such as rebound method, ultrasonic rebound comprehensive method, Rayleigh wave method and so on. The rebound method is the most commonly used method, which is relatively simple, but when using the rebound method to measure the surface strength of concrete, it will be affected by the increase in the composition of concrete admixtures, the use of admixtures, the gradual decrease in the part...

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Problems solved by technology

The rebound method is the most commonly used method, which is relatively simple, but when using the rebound method to measure the surface strength of concrete, it will be affected by the increase in the composition of concrete admixtures, the use of admixtures, the gradual decrease in the particle size of coarse aggregate, and the continuous increase in the proportion of mortar, etc. Factor constraints

If only the rebound method is used for testing, it is impossible to accurately measure the strength of solid concrete.

Ultrasonic rebound comprehensive method to test the compressive strength of concrete is a method of comprehensively testing the compressive strength of concrete by using at least two or more single methods or parameters (including mechanics, acoustics and physics, etc.), but different cement varieties and different equipment Factors such as frequency and measurement distance will greatly affect the accuracy of the method, and the method is cumbersome and inefficient.

The Rayleigh wave method retrieves the shear wave velocity by extracting the dispersion curve, and establishes the relationship between the shear wave velocity and the concrete strength to evaluate the concrete strength. However, due to equipment and other reasons, it is often unable to be used for small concrete components. , so the scope of application is also very limited

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