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Rapid Analysis Method of Concrete Chloride Ion Diffusion Coefficient Based on Double Control Lines

A chlorine ion diffusion and rapid analysis technology, which is applied in the field of rapid analysis of the chloride ion diffusion coefficient of concrete, can solve the problems of inability to accurately simulate chloride ions entering the interior of the concrete, large test sample size, time-consuming and labor-intensive problems, etc.

Active Publication Date: 2018-03-16
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the electric field acceleration test method, the chloride ion migrates into the concrete with the electric field loaded on both ends of the specimen as the driving force, but for the concrete exposed to the chloride salt environment, the chloride ion is actually the chloride ion concentration inside and outside the specimen The gradient is the driving force to diffuse into the concrete, so the electric field acceleration test cannot accurately simulate the process of chloride ions entering the concrete under real environmental conditions
In the natural immersion test, although the process of chloride ions entering the concrete is very close to the actual situation, this method needs to grind and sample the concrete layer by layer, and then use Fick's second law to simulate the concentration of chloride ions at different depths in the concrete. The chloride ion diffusion coefficient of concrete can be obtained by combining it. The test sample size is large, and fitting analysis is required when solving the solution. The process is complicated, time-consuming and labor-intensive.

Method used

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  • Rapid Analysis Method of Concrete Chloride Ion Diffusion Coefficient Based on Double Control Lines
  • Rapid Analysis Method of Concrete Chloride Ion Diffusion Coefficient Based on Double Control Lines
  • Rapid Analysis Method of Concrete Chloride Ion Diffusion Coefficient Based on Double Control Lines

Examples

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Embodiment 1

[0024] This embodiment, as a specific example of the rapid analysis method for the chloride ion diffusion coefficient of concrete based on double control lines, comprises the following steps:

[0025] 1. Determination of chloride ion diffusion control depth;

[0026] control figure 1 , take out the concrete specimen exposed to the one-dimensional diffusion of chloride ions at the age of 56 days after being exposed to a sodium chloride solution with a concentration of 16.5% by mass, dry the surface of the specimen, and dry cut the specimen along the direction perpendicular to the exposed surface of the specimen 1. Spray the silver nitrate solution color indicator with a concentration of 0.10mol / L on the section. After the indicator is sprayed for 15 minutes, draw the diffusion contour line 2 with a waterproof pen, and measure the color boundary line of the concrete section in 10 equal parts. The distance from the exposed surface, and the average distance between the color boun...

specific example

[0035] This embodiment, as another specific example of the rapid analysis method for the chloride ion diffusion coefficient of concrete based on double control lines, includes the following steps:

[0036]Take out the concrete specimen affected by the one-dimensional diffusion of chloride ions from the middle drill core of the 14-day-old concrete member exposed to artificial seawater dry-wet cycle conditions, dry the surface of the specimen, and dry cut along the direction perpendicular to the exposed surface of the specimen For the test piece, spray a silver nitrate solution color indicator with a concentration of 0.10mol / L on the section. After the indicator is sprayed for 15 minutes, use a waterproof pen to trace the diffusion contour line, and measure the color boundary line of the concrete section in 10 equal parts. The distance from the exposed surface of the test piece is calculated, and the average distance from the color boundary line to the exposed surface of the test...

Embodiment 3

[0045] This embodiment is a specific example for verifying the effectiveness of the method of the present invention, that is, according to the chloride ion diffusion coefficient analyzed in Example 1 and Example 2, the commercial numerical analysis software ANSYS is used to establish a concrete chloride ion diffusion model, and solve the corresponding exposure The free chloride ion content distribution situation in the concrete during age, then compares with the free chloride ion content that experiment records in embodiment 1 and embodiment 2:

[0046] Based on Fick's second law, the concrete chloride ion diffusion model was established by using the commercial numerical analysis software ANSYS. The concrete chloride ion diffusion coefficient obtained according to the analysis of Example 1 is 441.9mm 2 / a, and the measured surface chloride ion concentration of the concrete specimen is 2.97%, and the commercial numerical analysis software ANSYS is used to solve the distribution...

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Abstract

A method for quickly analyzing the chloride ion diffusion coefficient of concrete based on double control lines, comprising the following steps: (1) determination of the depth of chloride ion diffusion control; (2) design of double control lines and determination of chloride ion content; (3) calculation of concrete chloride ion Diffusion coefficient. This method can carry out dual control line design on concrete specimens conforming to the determination of diffusion control depth, and quickly calculate the chloride ion diffusion coefficient of concrete based on the calculation model of the chloride ion diffusion coefficient of double control lines, which can be widely used in ocean, deicing salt Durability analysis and service life research of concrete structures in isochloride environment.

Description

1. Technical field [0001] The invention relates to a method for quickly analyzing the chloride ion diffusion coefficient of concrete based on double control lines, specifically a method for judging the depth of chloride ion diffusion control, and using the calculation model of chloride ion diffusion coefficient based on double control lines to quickly calculate the concrete Chloride ion diffusion coefficient method. 2. Background technology [0002] Concrete structures in the marine environment gradually undergo durability damage due to corrosion by chloride salts, which greatly affects the service life of the building structure. Therefore, finding a rapid analysis method for the chloride ion diffusion coefficient of concrete is the key to research and evaluate the service life and durability of marine concrete. [0003] The existing methods for testing the diffusion coefficient of chloride ions mainly include electric field acceleration test and natural immersion test. In...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N13/00
CPCG01N13/00
Inventor 陈正蒋翊赵家琦杨绿峰冯庆革邓鹏
Owner GUANGXI UNIV