Method for performing non-destructive detection on evolution of three-dimensional carbonation depth of cement-based material through X-ray scanning

A technology of cement-based materials and carbonation depth, which is applied in the direction of using radiation for material analysis and preparation of test samples, etc. It can solve problems such as the inability to obtain carbonization information, the inability to detect carbonization transition zones, and the inability to obtain carbonization rate. , to achieve the effect of avoiding damage, ensuring integrity and ensuring accuracy

Inactive Publication Date: 2012-07-18
SOUTHEAST UNIV
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Problems solved by technology

First of all, the pH value of the phenolphthalein alcohol solution from pink to colorless is 9.0, while the pH value at the carbonization transition zone is 10.5-12, so this method cannot detect the carbonation transition zone
At the same time, this method cannot obtain the size of the carbonization rate and

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  • Method for performing non-destructive detection on evolution of three-dimensional carbonation depth of cement-based material through X-ray scanning

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Embodiment Construction

[0019] The X-ray computed tomography nondestructive detection method for the three-dimensional carbonation depth of cement-based materials of the present invention mainly consists of an X-ray computed tomography scanner, cement-based materials (clean slurry, mortar, concrete, reinforced concrete), accelerated carbonization box, and VG Studio MAX software It consists of four parts; the voltage and current of the X-ray computed tomography scanner are 195kV and 0.41mA respectively, the detector type is Y.XRD 0820, the number of detector units is 1024, and the number of pixels is 1024×1024. The shape of the cement-based material specimens is arbitrary, mainly cuboid and cylinder, and the size should not be too large, because the smaller the size, the higher the resolution of the three-dimensional reconstruction image. Due to the slow rate of carbonization reaction, in order to save time, it is advisable to adopt accelerated carbonization reaction, the carbon dioxide concentration i...

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Abstract

The invention provides a method for performing non-destructive detection on evolution of the three-dimensional carbonation depth of a cement-based material through X-ray computerized tomography and relates to a novel detection method for the carbonation depth of a cement-based material. The main principle is that: an image is reconstructed by acquiring ray attenuation information of a rotary object based on an X-ray source; a carbonized region and a non-carbonized region of the cement-based material are distinguished according to difference of gray value; and the defects in the traditional pHmethod of phenolphthalein alcohol solution are overcome. Under the condition of not damaging a test piece, the evolution process of the three-dimensional carbonation depth of the cement-based material along with the time is detected. By the method, flaw space distribution in the carbonation process, the flaw volume, the flaw closing area, the evolution law of porosity and hole dimensional distribution and the topological properties, such as connectivity, sinuosity and the like, of the hole can be achieved.

Description

technical field [0001] The invention combines the X-ray computerized tomography technology to propose a new non-destructive testing method, which can detect the evolution process of the three-dimensional carbonization depth inside the cement-based material over time without destroying the test piece. Based on the gray value difference of X-ray computed tomography, this method can clearly distinguish the carbonized area and the uncarbonized area of ​​the cement-based material. , crack closure area, porosity and pore scale distribution evolution law, and pore topological properties, such as connectivity, tortuosity, etc. The invention belongs to the field of cement and concrete basic research. Background technique [0002] For many years, the test method for the carbonation depth of cement-based materials is very single, the most commonly used method is the phenolphthalein alcohol solution method, that is, after the cement-based material specimen is carbonized to a certain age...

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Application Information

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IPC IPC(8): G01N23/04G01N1/28G01N1/44
Inventor 韩建德孙伟潘钢华
Owner SOUTHEAST UNIV
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