A Method of Analyzing the Cause of Concrete Cracking Based on CT Image

Abstract

The invention provides a quantitative determination and analyzing method of a concrete cracking reason. The field observation is performed on a building entity; the cracking due to the non-concrete material reason is primarily eliminated; according to the cracking serious degree, concrete core samples are respectively drilled and taken from different positions of the entity; the core samples are subjected to X-ray scanning; the uniformity of the stone distribution is expressed; the concrete total area is respectively calculated on the obtained three-dimensional slices; in order to eliminate the dimension influence, to calculate the coarse aggregate volume percentage Vg in a fixed slice step length interval or the coarse aggregate outer part volume percentage and to respectively calculate the coarse aggregate volume percentage of different-depth slices or the volume percentage except the coarse aggregates, different statistics tools are used for quantitatively describing the stone distribution uniformity in the concrete; the two important criteria in the concrete material crack is built; through the comparison between the core samples, or the combination with the specification limitation value, whether the crack is the concrete structure crack due to the concrete material per se becomes clear.

Description

technical field

[0001] The invention relates to a detection and analysis technology, which belongs to the technical field of building structures and materials. Background technique

[0002] The causes of concrete structure cracking are mainly divided into material reasons, construction reasons, design reasons and use reasons. Among them, the concrete material itself leads to structural cracking, which is the most important cause of concrete structure cracking. However, due to the complexity of the causes of cracks in concrete materials, it is difficult to quantitatively or qualitatively determine the specific causes of cracks in concrete materials. It is often judged by indirect methods such as visual inspection, consulting construction records, and expert experience judgments, lacking accurate, scientific, and objective judgment methods.

[0003] Based on the analysis of the principles of concrete, the cracks in concrete materials mainly come from the shrinkage of the slur...

Examples

Embodiment 1

[0034] The present invention will be further described in detail in conjunction with a certain actual project and specific preferred implementation modes.

[0035] A kind of method based on CT image analysis concrete material cracking cause of the present invention is:

[0036] Step 1 For a new project, conduct engineering visits, consult information, compare design drawings, conduct auxiliary property tests such as concrete strength grades and steel cover tests, and confirm that the cause of cracks has nothing to do with design and use factors, and material factors are highly suspected.

[0037] Step 2 Drill core samples from the seriously cracked and uncracked parts of the project site and number them respectively. The core sample has a diameter of 70mm and a length of 120mm. Visually, there are differences in the volume fraction and distribution of stones between the two groups of core samples.

[0038] Step 3 Carry out X-ray tomographic scanning of the core sample obtain...

technical field

[0001] The invention relates to a detection and analysis technology, which belongs to the technical field of building structures and materials. Background technique

[0002] The causes of concrete structure cracking are mainly divided into material reasons, construction reasons, design reasons and use reasons. Among them, the concrete material itself leads to structural cracking, which is the most important cause of concrete structure cracking. However, due to the complexity of the causes of cracks in concrete materials, it is difficult to quantitatively or qualitatively determine the specific causes of cracks in concrete materials. It is often judged by indirect methods such as visual inspection, consulting construction records, and expert experience judgments, lacking accurate, scientific, and objective judgment methods.

[0003] Based on the analysis of the principles of concrete, the cracks in concrete materials mainly come from the shrinkage of the slur...

Examples

Embodiment 1

[0034] The present invention will be further described in detail in conjunction with a certain actual project and specific preferred implementation modes.

[0035] A kind of method based on CT image analysis concrete material cracking cause of the present invention is:

[0036] Step 1 For a new project, conduct engineering visits, consult information, compare design drawings, conduct auxiliary property tests such as concrete strength grades and steel cover tests, and confirm that the cause of cracks has nothing to do with design and use factors, and material factors are highly suspected.

[0037] Step 2 Drill core samples from the seriously cracked and uncracked parts of the project site and number them respectively. The core sample has a diameter of 70mm and a length of 120mm. Visually, there are differences in the volume fraction and distribution of stones between the two groups of core samples.

[0038] Step 3 Carry out X-ray tomographic scanning of the core sample obtain...

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