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A method for detecting crack width of concrete surface

A technology of concrete surface and crack width, applied in the field of concrete, can solve problems such as difficulty in obtaining detection results

Active Publication Date: 2019-02-01
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Despite this, due to factors such as image noise, it is still difficult to obtain ideal detection results.

Method used

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  • A method for detecting crack width of concrete surface
  • A method for detecting crack width of concrete surface
  • A method for detecting crack width of concrete surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1 (principle of water absorption in cracks + video + deep learning)

[0034] Deep learning is the biggest breakthrough in artificial intelligence in recent years. In the field of computer image processing and video processing, deep learning has made breakthrough progress. It uses a certain amount of data as the training set, and automatically trains the model according to a certain method on the training set, so that the machine can learn the characteristics of the image autonomously without manual intervention. The trained model can be used in the actual production environment. Therefore, combining the above method of spraying liquid with the method of deep learning can better detect the width of cracks on the surface of concrete structures.

[0035] The schematic flow chart of the concrete surface crack width detection method of the embodiment of the present invention is as follows figure 1 shown.

[0036] A. Spray a predetermined amount of liquid on the c...

Embodiment 2

[0059] Example 2 (principle of water absorption in cracks + video + regression relational formula)

[0060] As the concrete absorbs water, the area where the surface is wet will gradually shrink until it shrinks around the crack. Depending on the rate at which the concrete absorbs liquid at different crack widths, the wetted area shrinks at different rates at different crack widths. In the second embodiment of the present invention, a regression relationship is established by using the shrinking rate of the area of ​​the wet area and the width of the crack. Using this relationship, the width of the crack can then be measured by the shrinkage rate of the wetted area.

[0061] The schematic flow chart of the concrete surface crack width detection method of embodiment two of the present invention is as follows image 3 shown.

[0062] A', Spray a predetermined amount of liquid on the concrete surface containing cracks, record the liquid absorption process of the concrete surfa...

Embodiment 3

[0083] Example 3 (principle of water absorption in cracks + video + regression relational formula)

[0084] Areas where the surface is wet will change in gray scale due to the water absorption of the concrete. According to the rate at which the concrete absorbs liquid at different crack widths, the gray scale change is different at different crack widths. In the second embodiment of the present invention, a regression relational expression is established by using the change in the gray level of the wet area and the width of the crack. Using this relational expression, the width of the crack can be measured by the change of the gray level of the wet area in the future.

[0085] The schematic flow chart of the concrete surface crack width detection method of embodiment three of the present invention is as follows Figure 4 shown.

[0086]A", Spray a predetermined amount of liquid on the concrete surface containing cracks, record the liquid absorption process of the concrete s...

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PUM

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Abstract

A method for detecting crack width of concrete surface includes such step as spraying a predetermined amount of liquid on concrete surface containing crack, recording liquid absorption process of concrete surface by video frequency in a predetermined time, and intercepting frame photograph at a predetermined time interval in video frequency; Storing a group of frame photographs obtained on the concrete surface into a training set in correspondence with the crack width of the concrete surface; N concrete surface regions containing cracks are sampled according to different absorption rates of liquid by the concrete at different crack widths, and the step A is repeated; B, train that training set with the method of depth learn to obtain the trained model; c, for video record of water spray onthat concrete surface containing cracks to be detected, inputting a group of frame photograph obtained on the concrete surface into the model for detection, and obtaining the crack width of the concrete surface. The invention can quickly, accurately and directly detect the crack width.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a method for detecting the crack width on the concrete surface. Background technique [0002] In recent years, my country has built about 2 billion square meters of new buildings every year. By the end of 2020, the national housing construction area is expected to increase by 40 billion square meters, with a huge number of buildings and a rapid construction speed. However, due to insufficient attention paid to the durability of concrete structures in previous years, a large number of structures have seriously deteriorated before reaching their service life. In this case, it is necessary to make an accurate assessment of the deterioration of the structure. [0003] In the past, on-the-spot assessments were often carried out by experts, which was time-consuming, laborious and cost-prohibitive. Using the method of image processing, it is possible to make a more accurate assessme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00G01B11/14
CPCG01B11/14G06T7/001G06T2207/10016G06T2207/20081G06T2207/30132
Inventor 安雪晖刘祖光
Owner TSINGHUA UNIV
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