Method for determining penetration depth of iodide ions in concrete

A technology of penetration depth and measurement method, which is applied in the field of determination of iodide ion penetration depth in concrete, can solve the problems affecting the accuracy and the inability to measure the diffusion coefficient of chloride ions, etc., and achieve the effect of simple and fast process

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

These two effects will affect the accuracy of the RCM test results. When the contained chloride ions exceed a certain limit, the experimental method of RCM will not be able to measure the chloride ion diffusion coefficient of the structure. Therefore, the current test method cannot solve the following two problems: Two situations: 1. Determination of permeability coefficient of internally mixed chloride ion concrete structure; 2. Determination of permeability coefficient of concrete structure that has been eroded by chloride ions

Method used

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  • Method for determining penetration depth of iodide ions in concrete
  • Method for determining penetration depth of iodide ions in concrete

Examples

Experimental program
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Effect test

Embodiment 1

[0030] I. Split test piece: After the electromigration test is completed, the test piece is immediately split into two halves on the pressure testing machine after being removed from the rubber cylinder;

[0031] II. Spraying reagent: first spray 1% potassium iodate solution to oxidize the iodine ions in the concrete to elemental iodine, and then spray 2% starch suspension;

[0032] III. Acidified surface: After the surface is slightly dry (about 15 minutes), spray 30% acetic acid solution;

[0033] IV. Measuring the penetration depth: the place where iodide ions penetrated is brown, and the penetration depth of iodide ions is measured after the concrete surface is colored.

Embodiment 2

[0035] I. Split test piece: After the electromigration test, the test piece is immediately split into two halves on the pressure testing machine after being removed from the rubber cylinder;

[0036] II. Spraying reagent: first spray 2% potassium iodate solution to oxidize iodine ions in concrete to elemental iodine, and then spray 2% starch suspension;

[0037] III. Acidified surface: After the surface is slightly dry (about 15 minutes), spray 30% acetic acid solution;

[0038] IV. Measuring the penetration depth: the place where iodide ions penetrated is brown, and the penetration depth of iodide ions is measured after the concrete surface is colored.

Embodiment 3

[0040] I. Split test piece: After the electromigration test is completed, the test piece is immediately split into two halves on the pressure testing machine after being removed from the rubber cylinder;

[0041] II. Spraying reagent: first spray 3% potassium iodate solution to oxidize the iodine ions in concrete to elemental iodine, and then spray 2% starch suspension;

[0042] III. Acidified surface: After the surface is slightly dry (about 15 minutes), spray 30% acetic acid solution;

[0043] IV. Measuring the penetration depth: the place where iodide ions penetrated is brown, and the penetration depth of iodide ions is measured after the concrete surface is colored.

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Abstract

The invention discloses a method for determining the penetration depth of iodide ions in concrete, which comprises the following steps of: (101) splitting a test piece: splitting the test piece into two halves after a migration test is completed; (102) spraying a reagent: spraying a potassium iodate solution to the splitting face of concrete, and spraying a starch suspension; (103) acidifying the surface: spraying a weak acid solution when the splitting face of concrete is slightly dry after the step (102) is completed; and (104) measuring the penetration depth: measuring the penetration depth of iodide ions after the splitting face of concrete develops a color, wherein the penetration place of iodide ions displays brown. The test process of the determination method is not influenced by chloride ions inside concrete, the process is simple and quick, and durability design and life predication can be carried out on internally-doped concrete structures and structures subject to chloride ion corrosion.

Description

[Technical Field] [0001] The invention relates to an unsteady state electromigration test, in particular to a method for measuring the penetration depth of iodide ions in concrete. [Background technique] [0002] The durability of concrete structures essentially depends on the process by which ions or molecules enter or pass through the material in the form of liquid or gas, and the structural life depends on the speed at which these substances enter the concrete. [0003] The intrusion of hazardous media into concrete is mainly affected by the permeability of concrete. The term "permeability" is widely used, and generally refers to the characteristics that affect the intrusion of the medium. [0004] The measurement of chloride ion diffusion coefficient has a key influence on the prediction of diffusion rate. At present, the most commonly used method is the unstable electromigration test (RCM), which measures the average value (T) of the initial and final temperature of the anolyt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08G01N13/04
Inventor 刘军邢锋董必钦刘伟宋应秋张鸣
Owner SHENZHEN UNIV
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