Non-contact nondestructive testing method for strength of water-immersed concrete

A concrete strength, non-contact technology, applied in the direction of measuring devices, processing detection response signals, using sound waves/ultrasonic waves/infrasonic waves to analyze solids, etc., can solve the problems that water detection methods are no longer applicable

Inactive Publication Date: 2019-08-16
NANJING HYDRAULIC RES INST
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  • Claims
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Problems solved by technology

[0004] However, since the structure to be tested is submerged in water, many ...

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  • Non-contact nondestructive testing method for strength of water-immersed concrete
  • Non-contact nondestructive testing method for strength of water-immersed concrete
  • Non-contact nondestructive testing method for strength of water-immersed concrete

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Embodiment Construction

[0040] Below in conjunction with accompanying drawing and embodiment describe in further detail:

[0041] Those skilled in the art can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It should also be understood that terms such as those defined in commonly used dictionaries should be understood to have a meaning consistent with the meaning in the context of the prior art, and will not be interpreted in an idealized or overly formal sense unless defined as herein explain.

[0042] Method steps of the present invention are as follows:

[0043] Step 1): Establish Transducer Incidence Angle

[0044] In order to reduce the shear wave caused by obliquely incident longitudinal waves in concrete due to mode conversion, the critical angle θ is selected according to Snell's theorem cr :

[0045]

[0046...

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Abstract

The invention discloses a non-contact nondestructive testing method for the strength of water-immersed concrete, and belongs to the technical field of nondestructive testing. For water-immersed concrete structures widely existing in water conservancy, ocean and bridge engineering, through a piezoelectric ceramic probe, by utilizing a water coupling effect, a Rayleigh wave is excited on the surfaceof a concrete workpiece in a transmitting and receiving mode under water; a wave velocity and a head wave peak of a response signal are extracted through Hilbert transform; through a K-means clustering algorithm, a classifier is trained by using a training set sample measured in a laboratory; and the wave velocity and the wave peak actually measured under the water are input into the classifier,and the strength of the tested concrete workpiece is intelligently identified. A new method is provided for nondestructive testing and online monitoring of the underwater concrete structures; a basisis provided for safety evaluation of the underwater concrete structures; and the non-contact nondestructive testing method plays an important role in guaranteeing the structural safety of major infrastructures.

Description

technical field [0001] The invention relates to the field of nondestructive testing, in particular to an underwater nondestructive testing method for concrete strength. Background technique [0002] The "Code for Design of Concrete Face Rockfill Dams" (SL228-2013) stipulates that "the strength grade of face concrete should not be lower than C25". "Code for Design of Concrete Gravity Dams" (SL319-2005) stipulates that "the maximum principal compressive stress of the dam body should not be greater than the allowable compressive stress value of concrete". It can be seen that the strength of concrete is an important index reflecting the performance of concrete materials and an important basis for evaluating the safety of concrete structures. [0003] In water conservancy, marine, and bridge engineering, there are a large number of concrete structures submerged underwater. Due to the effects of water erosion and corrosion, the strength of underwater concrete is attenuated, even ...

Claims

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Application Information

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IPC IPC(8): G01N29/04G01N29/46
CPCG01N29/041G01N29/46G01N2291/0232G01N2291/02827
Inventor 王子健向衍刘成栋
Owner NANJING HYDRAULIC RES INST
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