Method for positioning tiny crack on surface of concrete

A technology of concrete surface and positioning method, applied in the direction of measuring devices, instruments, optical devices, etc., can solve the problems of not having many cracks, difficult to identify small cracks, limited precision, etc.

Inactive Publication Date: 2012-01-04
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a kind of concrete for the defects of the traditional concrete crack location method in the background technology, such as limited precision, difficulty in identifying small cracks, inability to locate multiple cracks in a wide range, and inability to automatically identify areas where cracks ex

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  • Method for positioning tiny crack on surface of concrete
  • Method for positioning tiny crack on surface of concrete
  • Method for positioning tiny crack on surface of concrete

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Embodiment Construction

[0026] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0027] Such as figure 1 As shown, when the present invention is actually implemented, the concrete sample 1 to be tested, the lighting system 2, the image acquisition system 3, and the image processing system 4 are arranged at the test site.

[0028] Such as figure 2 As shown, the method for locating tiny cracks on the concrete surface disclosed by the invention, the steps include:

[0029] The first step: surface treatment of the concrete sample to be tested, remove non-structural attachments, the surface is simple and flat, and marking points need to be made on the surface in special cases;

[0030] Step 2: Arrange the lighting system. Natural light can be used during the day, and light reinforcement is needed when the light is insufficient;

[0031] Step 3: Record the reference image of the sample surface through the image acquisition system...

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Abstract

The invention discloses a method for positioning a tiny crack on the surface of concrete, which is based on a related technique of a digital image. Correlation matching is carried out on two surface images of a concrete structure before and after deformation under the action of a certain load, so as to obtain the spatial position of each point before and after deformation on the surface in a full field; the change of the spatial position is a placement field; accurate stress field distribution can be obtained through fitting optimization and differential processing on the curved surface; and the features of the stress field distribution can be automatically identified by a computer so as to judge a strange region, thus the position of the crack is judged. The method disclosed by the invention can be used for identifying the position of the tiny crack on the surface of the concrete; as for the sample the maximum three-dimensional size of which is 10m, the tiny crack the width of which is more than 10 microns can be identified, and the advantages of no contact and no damage on the sample can be achieved.

Description

technical field [0001] The invention relates to a method for locating tiny cracks on the surface of a concrete component. For the size of the component within the range of 10 meters, the width of the tiny cracks that can be positioned reaches 10 microns. Background technique [0002] The initiation and propagation of concrete cracks generally occur on the surface of the structure, which is reflected in the local discontinuity of the surface material. Through the precise positioning of tiny cracks, the source of the cracks in the concrete structure can be found, and various methods can be used to prevent their expansion and further development of the hazard. At present, there are very limited methods for locating cracks in concrete structures. The most common method is to use ultrasonic detection technology to locate the depth and width of cracks by using the transmission characteristics of ultrasonic waves. This method has limited measurement accuracy, and it is difficult t...

Claims

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Application Information

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IPC IPC(8): G01N21/88G01B11/16
Inventor 雷冬乔丕忠薛荣军张云发
Owner HOHAI UNIV
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