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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 testing device, which can solve the problems of airtightness and load quantification of the concrete gas radial permeability test

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

Embodiment 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 air valve, 11-2 second air valve, 11-3 third air valve, 11-4 fourth air valve, 11-5 fifth air valve , 12 gas conduits, 13 cylinders, 14 computers, 15 loading devices. The concrete gas radial permeability test device of the present invention includes a pressure device and a gas delivery device. The pressure device includes sample 6. Sample 6 in this embodiment is a concrete annular sample. Samples of different shapes can be set according to needs during testing; Bond the induction gasket 2, and then re-coat the self-leveling adhesive 4 on the surface of the induction gasket 2, and paste it in the middle of the whole body between the upper rigid sealing device 1-1 and the lower rigid sealing device 1-2...

Embodiment 2

[0056] The difference from Example 1 is that the mix ratio (g) of the prefabricated annular concrete sample 6 is: 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, and based on the characteristics of the sensor, the pressure on 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 4.01Bar, and use the air pressure micro-regulator to fine-tune the air pressure in the gas conduit to about 4.01Bar. The test results are as follows: Figure 5 shown.

Embodiment 3

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