Method for evaluating concrete stability through image analysis

An image analysis and concrete technology, applied in the field of concrete material performance evaluation, can solve the problem of not being able to truly reflect the aggregate particle size, etc., and achieve the effect of simple operation and intuitive image.

Active Publication Date: 2019-06-18
CHINA BUILDING MATERIALS ACAD
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Problems solved by technology

[0005] The main purpose of the present invention is to provide a method for evaluating the stability of concrete through image analysis. The technical problem to be solved is to overcome the shortcomings of the traditional image analysis method that cannot truly reflect the aggregate particle size, and can accurately, comprehensively and reliably evaluate Concrete segregation degree and aggregate particle size distribution

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  • Method for evaluating concrete stability through image analysis
  • Method for evaluating concrete stability through image analysis
  • Method for evaluating concrete stability through image analysis

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Embodiment

[0095] The present embodiment provides a method for evaluating the stability of concrete by image analysis, specifically comprising the following steps:

[0096] (1) Choose five kinds of concrete B-F with different aggregate gradations, and their mix ratios are listed in Table 1; according to the mix ratio in Table 1, prepare the aggregates of concrete B-F respectively;

[0097] Among them, such as figure 1 As shown, use cyan ore 1 with a particle size of 5-8mm to replace the aggregate to be tested with a particle size of 5-8mm; use red ore 2 with a particle size of 8-12mm to replace the aggregate to be tested with a particle size of 8-12mm; use 12- Yellow ore 3 with a particle size of 15mm replaces the aggregate to be tested with a particle size of 12-15mm; black ore 4 with a particle size of 15-20mm replaces the aggregate to be tested with a particle size of 15-20mm;

[0098] (2) According to the mix ratio in Table 1, mix the raw materials of concrete B-F respectively, and ...

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Abstract

The invention relates to a method for evaluating concrete stability through image analysis. The method comprises steps that equivalent concrete preparation, aggregates of different particle size segments of the to-be tested concrete are replaced by the same amount of natural aggregates of different colors; equivalent concrete sample preparation, the equivalent concrete is mixed and is poured intoa vertically-placed long strip mold for molding to obtain an equivalent concrete sample, and standard maintenance is carried out for 7-28 days; image analysis on the equivalent concrete sample, a cross-sectional image of the equivalent concrete sample is acquired; specified threshold setting, the cross-sectional image is segmented to obtain a binary image of the equivalent concrete sample; the binary image is divided into n equal parts perpendicular to the casting direction; the proportion of the area of natural aggregates of each color in each equal part to the equal part is calculated, and aseparation index SI is calculated. The larger the value of the separation index SI, the higher the segregation degree of concrete and the worse the stability.

Description

technical field [0001] The invention relates to the field of evaluation methods for concrete material properties, in particular to a method for evaluating the stability of concrete through image analysis. Background technique [0002] Concrete is one of the most important materials in the field of civil engineering. Because of its low production cost, wide source of raw materials, good working performance and durability, it is widely used in civil engineering, transportation infrastructure construction, marine engineering and other fields. . [0003] However, in the actual construction of concrete, there will be stability problems such as segregation. The stability of concrete is damaged, resulting in segregation, which has a great impact on the working performance and durability of concrete. In the freshly mixed state, the poor stability will lead to poor deformation ability of the concrete, and it is easy to be blocked when encountering steel bars and other structures, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/02G06T7/136
Inventor 安晓鹏武斌史才军魏子易
Owner CHINA BUILDING MATERIALS ACAD
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