Method for determining oxygen diffusion coefficient in cement-based material and test device

A technology of cement-based materials and test devices, applied in measuring devices, analytical materials, diffusion analysis, etc., can solve the problems of low concrete porosity and small gas diffusion coefficient

Pending Publication Date: 2017-10-24
ZHEJIANG UNIV OF TECH
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  • Application Information

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Problems solved by technology

However, due to the low porosity and small gas diffusion coefficient of concrete, there is no t...

Method used

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  • Method for determining oxygen diffusion coefficient in cement-based material and test device
  • Method for determining oxygen diffusion coefficient in cement-based material and test device
  • Method for determining oxygen diffusion coefficient in cement-based material and test device

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Embodiment Construction

[0058] The present invention will be further explained below in conjunction with the drawings

[0059] Reference Figure 1 ~ Figure 4 , A method for determining the diffusion coefficient of oxygen in cement-based materials, including the following steps:

[0060] 1) Preparation of cement-based materials to be tested

[0061] Pouring and forming the cement-based material specimen to be tested, cutting the measured cement-based material into a cylinder of a certain thickness, and coating the side of the specimen (non-oxygen diffusion surface) with epoxy resin to isolate the influence of the external atmosphere;

[0062] 2) Connection of the overall device

[0063] Put the rubber sealing gasket on the test piece obtained in 1) and connect the two gas chambers with stud bolts to form a sealed whole. The end surface of the test piece is the oxygen diffusion surface, and a little petroleum jelly is applied to the contact position to increase the tightness; The inlet valve on the upper part ...

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Abstract

The invention discloses a method for determining an oxygen diffusion coefficient in a cement-based material. The method comprises the following steps of (1) preparation of a to-be-tested specimen of a cement-based material; (2) connection of a test device; and (3) determination of the oxygen diffusion coefficient Df in the cement-based material. The invention further provides a test device for determining the oxygen diffusion coefficient in the cement-based material. The test device comprises an air supply system, a specimen, left and right gas chambers and a sensing test system. The driving force of oxygen diffusion in the whole process is only concentration gradient, so that the diffusion coefficient of the oxygen in the specimen of the cement-based material can be determined, the measurement method is simple and data are accurate and reliable. A data foundation can be provided for further research of the corrosion process of the oxygen on steel rebar in the cement-based material through determining the transmission rule of the oxygen in the cement-based material.

Description

Technical field [0001] The invention relates to a method and a test device for determining the oxygen diffusion coefficient in cement-based materials, and belongs to the technical field of civil engineering material performance determination. Background technique [0002] The corrosion of the steel bars in the concrete structure is the most important factor causing the deterioration of the structural service performance. After the surface of the steel bar is deblunt, the oxygen in the air diffuses to the surface of the steel bar through the concrete, and the oxygen diffusion coefficient in the concrete directly determines the corrosion rate of the steel bar. Therefore, as one of the necessary conditions for steel corrosion in concrete, the determination of the diffusion coefficient of oxygen in concrete has clear scientific and engineering application value. However, due to the low porosity of concrete and the small gas diffusion coefficient, there is no test device for effectiv...

Claims

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Application Information

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IPC IPC(8): G01N13/00
CPCG01N13/00G01N2013/003
Inventor 付传清金南国郭健周露泉
Owner ZHEJIANG UNIV OF TECH
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