Method for testing diffusion coefficient of iodide ions in concrete

A test method and diffusion coefficient technology, applied in measuring devices, instruments, surface/boundary effects, etc., can solve problems affecting the accurate determination of chloride ion diffusion coefficient, and achieve the effect of solving permeability coefficient

Inactive Publication Date: 2017-10-27
SHENZHEN UNIV
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Problems solved by technology

[0004] At present, relevant research at home and abroad mainly focuses on the chloride ion diffusion coefficient, but the chloride ion contained in the concrete will affect the accurate determination of the chloride ion diffusion coefficient

Method used

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  • Method for testing diffusion coefficient of iodide ions in concrete
  • Method for testing diffusion coefficient of iodide ions in concrete
  • Method for testing diffusion coefficient of iodide ions in concrete

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Embodiment Construction

[0028] The steps of the concrete iodine ion diffusion coefficient test method of the embodiment of the present invention are as follows:

[0029] 1. Prepare a cylindrical test block with a diameter of 100mm and a height of 100mm, and standard curing of the test block for 28 days;

[0030] 2. Put the test piece into saturated calcium hydroxide and soak to the water saturation state. The water saturation of the test piece is: the mass of the test piece changes less than 0.1% within 24 hours;

[0031] 3. After the test piece is saturated with water, let its surface dry at room temperature. Except for the top surface, the other surfaces (cylindrical surface and bottom surface) are sealed with a waterproof layer, such as epoxy resin or paraffin wax;

[0032] 4. The test piece is immersed in an aqueous solution with a concentration of 2.8mol / L NaI (sodium iodide), and the immersion period is 35 days;

[0033] 5. After the immersion expires, take out the test piece, remove the crystalline salt...

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Abstract

The invention discloses a method for testing the iodide ion diffusion coefficient of concrete, which comprises the following steps: soaking the treated concrete test block in an aqueous solution of sodium iodide for not less than 30 days; The iodide ion deposition amount of each layer was obtained by chemical analysis of the powder sample; the iodide ion diffusion coefficient was calculated by nonlinear fitting of Fick's second diffusion equation with the obtained iodide ion deposition amount data of each layer. The present invention uses iodide ions instead of chloride ions as penetrating ions when measuring the diffusion coefficient of chlorine ions, studies the penetration process and combination mechanism of iodide ions in concrete structures, and compares them with the diffusion process and combination of chloride ions to establish iodine ions. The ion natural diffusion experiment method calculates the iodine ion diffusion coefficient and then converts it into the chloride ion diffusion coefficient, thereby solving the problem of the permeability coefficient of the internal chloride ion concrete structure.

Description

[Technical Field] [0001] The invention relates to an iodine ion penetration test on the surface of concrete, in particular to a method for testing concrete iodine ion diffusion coefficient. [Background technique] [0002] Although concrete is a very durable material, over time, degradation of various properties is inevitable. This deterioration may threaten the function and safety of the concrete structure, thereby affecting its service life. As we all know, the main factors that cause the durability of concrete structures are: concrete carbonization, chloride ion erosion, alkali-aggregate reaction, freeze-thaw cycles, steel corrosion, etc. Among them, the corrosion of steel bars is the main problem in durability. However, among the problems that cause corrosion of steel bars, the effects of chloride ion and carbonization are the most significant. In coastal areas, the corrosion of steel bars caused by chloride ion invasion is greater than carbonization. With the increase in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N13/04
CPCG01N13/04
Inventor 刘军钟燊钟道君邢锋韩宁旭
Owner SHENZHEN UNIV
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