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A non-destructive detection method for buried concrete early-frozen ice

A non-destructive testing and concrete technology, which is applied in measuring devices, instruments, investigation stages/state changes, etc., can solve the problems of evaluating the early freezing damage of negative temperature concrete, which has not yet been found, and achieves easy operation, accurate and reliable measurement methods. , the effect of low cost

Active Publication Date: 2020-11-03
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has not been found to use the resistivity method to monitor and evaluate the early frost damage of negative temperature concrete.

Method used

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  • A non-destructive detection method for buried concrete early-frozen ice
  • A non-destructive detection method for buried concrete early-frozen ice
  • A non-destructive detection method for buried concrete early-frozen ice

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Experimental program
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Effect test

specific Embodiment approach 1

[0039] Specific implementation mode one: as Figure 1-Figure 3 As shown, a non-destructive detection method for embedded concrete early frozen ice, said method is realized based on temperature tester 3, resistivity tester 11 and two test devices, said two test devices are testing Device one 8 and test device two 9;

[0040] Described testing device one 8 and testing device two 9 all comprise quadrangular prism frame 1, and described testing device one 8 also comprises a plurality of thermocouples 4 and many pairs of electrode nets 2, and described testing device two 9 also comprises a pair of electrode nets 2;

[0041] The specific structure of the test device-8 is: two opposite sides in the quadrangular prism frame 1 are respectively fixed with multiple pairs of electrode nets 2, and the plurality of pairs of electrode nets 2 are arranged from top to bottom, each pair of electrode nets 2 All connect lead 5, and the other end of described lead 5 is connected with described r...

specific Embodiment approach 2

[0051] Specific implementation mode two: as Figure 1-Figure 3 As shown, this embodiment is a further description of the specific embodiment one. The distance between each pair of electrode nets 2 in the test device one 8 and the test device two 9 should be at least greater than 3 times the maximum aggregate particle size of the concrete. times (the spacing, size and material of each pair of electrode nets 2 in the test device 2 9 are the same as those of the test device 1 8, so as to avoid the influence caused by different settings), so as to avoid the contingency caused by the existence of large concrete aggregates to the test data Impact.

specific Embodiment approach 3

[0052] Specific implementation mode three: as figure 1 , image 3 As shown, this embodiment is a further description of specific embodiment one or two. The installation position of the pair of electrode grids 2 in the test device two 9 should be located in the middle of the control group concrete specimen 7, and the The size of the control group concrete specimen 7 should be at least 3 times the size of the concrete block between the pair of electrode grids 2, so that the range of the transmission path of the current in the device two 9 is the same as the range of the transmission path of the device one 8, because The transmission of ions is not only directly transmitted through the concrete between the electrode grid pairs, but also extends to a certain space outside the concrete.

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Abstract

The invention discloses a nondestructive testing method of early freezing and icing of embedded-type concrete, and belongs to the technical field of concrete detection. According to the nondestructivetesting method disclosed by the invention, the freezing and icing conditions of different parts of concrete during winter construction can be monitored, and the quality of the concrete during construction in winter is ensured. The method comprises the following steps: 1, setting concrete in a constant-temperature box having the same proportion ratio as site concrete as a control group, and respectively monitoring the change of the resistance ratio and temperature of the site concrete at different depths and change of the resistance ratio of the control group concrete; and 2, judging whether the site concrete enters into a negative temperature state through the temperature change of the site concrete, and judging whether the concrete located in the position is frozen and iced or not through the proportion of resistance ratios of the site concrete to the control group concrete, and judging the time of entrance of the concrete into various icing stages from the curve trend of the resistance ratio proportions if the icing phenomenon occurs. The nondestructive testing method disclosed by the invention is used for performing nondestructive test on early freezing and icing of the concrete.

Description

technical field [0001] The invention belongs to the field of concrete detection, and in particular relates to a non-destructive detection method for embedded concrete which is frozen early. Background technique [0002] There are about 3×10 7 m 3 Concrete needs to be constructed in winter, and the workload is huge. However, the cold temperature is very unfavorable to concrete engineering, and construction quality accidents often occur in winter, resulting in staggering economic losses, so the health monitoring of concrete is very important. Concrete non-destructive testing technology can enable construction personnel to know the structural development and damage information inside the concrete without damaging the important structure of the concrete, so that remedial measures can be taken in time. For the concrete in winter construction, especially for the concrete containing a large amount of unhydrated water in the early stage, for the evaluation of its frost damage, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/04G01N27/04
CPCG01N25/04G01N27/041
Inventor 杨英姿桑源于清林江守恒吕承博高金麟辛光耀
Owner HARBIN INST OF TECH
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