Device and method for testing radial permeability of concrete gas

A gas permeation and testing device technology, applied in measuring devices, liquid tightness measurement using liquid/vacuum degree, permeability/surface area analysis, etc., to achieve fast and accurate testing, simple device structure, and broad application prospects

Inactive Publication Date: 2019-09-13
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Purpose of the invention: One of the purposes of the present invention is to provide a concrete gas radial permeability t

Method used

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  • Device and method for testing radial permeability of concrete gas
  • Device and method for testing radial permeability of concrete gas
  • Device and method for testing radial permeability of concrete gas

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0038] Example 1

[0039] Such as figure 1 As shown, among them: 1-1 upper rigid sealing device, 1-2 lower rigid sealing device, 2 induction gasket, 3 gas diffusion tube, 4 adhesive, 5 multimeter, 6 sample, 7 gas nozzle, 8 barometer, 9 gas buffer bottle, 10 air pressure micro regulator, 11-1 first gas valve, 11-2 second gas valve, 11-3 third gas valve, 11-4 fourth gas valve, 11-5 fifth gas valve , 12 gas pipes, 13 gas cylinders, 14 computers, 15 loading devices. The concrete gas radial permeability test device of the present invention includes a pressure device and a gas transmission device. The pressure device includes the sample 6. The sample 6 in this embodiment is a concrete ring sample, and different shapes of samples can be set according to the needs during the test; the upper and lower end surfaces of the sample 6 are respectively coated with self-leveling adhesive 4, and then centered respectively Bond the induction gasket 2, and then re-coat the surface of the inductio...

Example Embodiment

[0055] Example 2

[0056] The difference from Example 1 is that the mixing ratio (g) of the precast annular concrete sample 6: cement-433.0, sand-655, coarse aggregate (5-20mm)-1117, water-195, admixture-2.20. During the loading process, a multimeter was used to detect that each resistance in the induction washer was 2.6KΩ. Based on the sensor characteristics, the pressure of the induction washer was equivalent to the pressure of the sample, which was 0.5MPa. During the test, open the air valve on the high-pressure gas cylinder to make the air pressure reach about 4.01 Bar, and use the air pressure micro regulator to fine-tune the air pressure in the gas duct to about 4.01 Bar. The test results are as follows Figure 5 Shown.

Example Embodiment

[0057] Example 3

[0058] The difference from Example 1 is that the mixing ratio (g) of the precast annular concrete sample 6: cement-445.0, sand-652, coarse aggregate (5-20 mm)-1142, water-156, admixture-4.45. During the loading process, a multimeter is used to detect that each resistance in the induction washer is 1.62KΩ. Based on the sensor characteristics, the pressure of the induction washer is equivalent to the pressure of the sample, which is 10.0MPa. During the test, open the air valve on the high-pressure gas cylinder to make the air pressure reach about 8.01 Bar, and use the air pressure micro regulator to fine-tune the air pressure in the gas duct to about 8.01 Bar. The test results are as follows Image 6 Shown.

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Abstract

The invention discloses a device and a method for testing the radial permeability of concrete gas. The device comprises a pressure device and a gas conveying device; the pressure device comprises a sample, a rigid sealing device arranged between the upper end and the lower end of the sample, a loading device which acts on the rigid sealing device, a sensing gasket placed between the sample and thecontact surface of the rigid sealing device, and a universal meter connected with the sensing gasket; and the gas conveying device is connected with the pressure device. According to the device and the method disclosed by the invention, a flexible sensor is embedded into an elastic gasket to prepare the self-sensing gasket for monitoring a load borne by the sample; the problem of concrete sealingand load quantification is solved; the quantitative real-time capture of the air pressure change in the gas permeation process is realized through a high-precision barometer in the gas conveying device; and the quantitative representation of a radial permeability coefficient of the concrete gas is realized.

Description

technical field [0001] The invention relates to a permeability testing device and method, in particular to a concrete gas radial permeability testing device and method. Background technique [0002] Concrete is the most important building material today. It is widely used in construction, transportation, bridges, water conservancy, underground engineering and other fields. At the same time, it faces severe environmental tests, such as rock and soil environment, marine environment, and atmospheric environment. As one of the durability indicators of concrete, the permeability has attracted much attention, mainly including water permeability, ion permeability and gas permeability. Water permeability is no longer applicable for high-strength and ultra-high-strength concrete because it is too dense. The scope of application of ion permeability test is limited because of the need for pre-treatment, such as saturation. Therefore, the gas permeability of concrete has become an imp...

Claims

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Application Information

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IPC IPC(8): G01N15/08G01M3/26
CPCG01N15/0826G01M3/26
Inventor 张云升钱如胜石加顺乔宏霞
Owner SOUTHEAST UNIV
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