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

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...

AI Technical Summary

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 the proportion of calcium hydroxide consumption in cement-based materials.

Finally, the carbonization information obtained by this method is 2-dimensional plane information, and the carbonization information of 3-dimensional space cannot be obtained.

At present, there are no public reports at home and abroad

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