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Test method for XCT nondestructive detection of sulfate erosion damages of concrete material

A technology of non-destructive testing and test methods, applied in the direction of analyzing materials, using radiation for material analysis, using wave/particle radiation for material analysis, etc., to achieve the effect of ensuring integrity

Inactive Publication Date: 2016-08-31
SOUTHEAST UNIV
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  • Test method for XCT nondestructive detection of sulfate erosion damages of concrete material

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Embodiment

[0024] The present invention takes recycled concrete as an example, and the specific mix ratio is shown in the following table.

[0025]

[0026] Stir according to the above mixing ratio, and form a 40mm×40mm×160mm concrete specimen. After forming, it will be cured with the mold for 24 hours. After the mold is removed, it will be placed in a standard curing room (temperature 20±1°C, RH above 95%) for 56 days; After drying in a drying oven at 60°C for 48 hours, the first round of XCT scanning was performed, recorded as the information that the corrosion age was 0 days, and placed in a dry-wet cycle simulation test chamber. The dry-wet cycle system is set as follows: the cycle is 3 days, soaked in sulfate solution for 21 hours, air-dried at room temperature for 3 hours, dried at 60°C for 45 hours, cooled at room temperature for 3 hours, and the dry-wet cycle is one cycle. After the number of dry and wet cycles was 10, 30, 60 and 100, the specimens were taken out, and the sec...

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Abstract

The invention discloses a test method for XCT nondestructive detection of the sulfate erosion damages of a concrete material. The method comprises the following steps: measuring the X-ray attenuation in different directions to reconstruct an image, and quantitatively analyzing the initial state of a concrete test piece and the internal structure in the sulfate erosion process according to gray value change in order to obtain the defect (aperture and crack) information of the test piece, wherein the total porosity, the pore size distribution and other pore structure information can be obtained through the aperture analysis, and provides bases for researching the sulfate erosion damage accumulation rule of the concrete. The method can be combined with a loading device to realize real-time observation of the whole damage process of the microstructure of the concrete test piece under the load and sulfate coupling action.

Description

technical field [0001] The invention relates to the field of concrete materials, in particular to a test method for non-destructive detection of sulfate erosion damage. Background technique [0002] At present, the methods for non-destructively characterizing the sulfate attack damage of concrete materials are relatively simple. The most commonly used method is to regularly test the acoustic time of concrete specimens at different corrosion ages with an ultrasonic testing analyzer, and then convert them into relative dynamic elastic moduli to characterize The degree of damage within the concrete material. This method is simple and convenient, but there are many problems. First of all, the ultrasonic testing analyzer can only characterize the homogeneous defects inside the concrete material, but cannot reflect the position and size of the defects. Secondly, the ultrasonic testing analyzer obtains two-dimensional information, and cannot obtain spatial three-dimensional damag...

Claims

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Application Information

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IPC IPC(8): G01N23/04
CPCG01N23/046
Inventor 高建明祁兵陈菲陈燕娟
Owner SOUTHEAST UNIV
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