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Device and method for testing porosity of porous material by using gas

A porous material and porosity technology, which is applied in suspension and porous material analysis, measuring devices, and analytical materials, can solve problems such as deviation of test results, damage to material pore walls, and threats to the health of test operators. Short, Simple Effects

Pending Publication Date: 2020-04-10
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mercury intrusion method usually uses hundreds of MPa pressure to drive the intrusion of mercury into the sample, which will lead to the destruction of the pore wall of the material and ultimately affect the test results of the pore structure parameters.
At the same time, liquid mercury is a toxic reagent and has certain volatility, which poses a certain threat to the health of test operators.
The drainage method can solve the above problems well, but because water molecules cannot enter the tiny pores, only larger pore parameters can be obtained, and the test process will cause a certain swelling of the cement-based material, which will eventually lead to deviations in the test results

Method used

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  • Device and method for testing porosity of porous material by using gas
  • Device and method for testing porosity of porous material by using gas
  • Device and method for testing porosity of porous material by using gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A device for testing the porosity of porous materials with gas, comprising a sample 13, the test device includes a sealing device 7, a computer 4 and a gas delivery device; the sealing device 7 is connected to the gas delivery device, and the computer 4 is connected to the gas delivery device The gas device is connected; the sealing device includes a sealing sleeve 11 and a confining pressure chamber 8, a sealing sleeve 11 is provided in the confining pressure chamber 8, and a sample 13 is provided in the sealing sleeve 11; The sealing component 10 is provided with a ventilating component 9 under the sample 13, and hoops 12 are provided at the upper and lower ends of the outer side of the sealing sleeve 11 .

[0048] The gas delivery device includes a gas conduit 6 and a gas cylinder 1 , and the gas cylinder 1 is connected to the sealing device 7 through the gas conduit 6 .

[0049] The gas conduit 6 is provided with a barometer 3 , and the barometer 3 is connected with...

Embodiment 2

[0055] A kind of test method utilizing the device described in embodiment 1

[0056] P·II52.5 Portland cement was used to form cylindrical mortar sample 13 with tap water. Mixing ratio (g): cement 550.0, sand 831.5, water 275, admixture 0.00. Mortar samples are formed according to the mix ratio, and the standard curing is 180d. Prefabricated cylindrical samples before the test, dried at 60°C to constant weight, and tested the air tightness of the pressure device and gas transmission device at the same time: close the fifth air valve 5-5, the sixth air valve 5-6, open the first air valve Valve 5-1, the second air valve 5-2, the third air valve 5-3, and the fourth air valve 5-4 make the gas conduit 6 of the gas delivery device under the gas pressure, and observe that the reading of the barometer 3 does not change. The air-tightness of the gas transmission device is good; then the gas transmission device with good sealing performance is connected with the sealing device, the sa...

Embodiment 3

[0070] The difference from Example 2 is that during the test, the set confining pressure p c =3.5MPa, adjust the gas valve 5-2 to make the pressure in the conduit 6 of the gas delivery device about p 1 =26.00bar, the test result is as follows Figure 4 shown.

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Abstract

The invention discloses a device and a method for testing porosity of a porous material by using a gas. The device comprises a test device and a sample, wherein the test device comprises a sealing device, a computer and a gas transmission device; the sealing device is connected with the gas transmission device, and the computer is connected with the gas transmission device; the sealing device comprises a sealing sleeve and a confining pressure chamber, the sealing sleeve is arranged in the confining pressure chamber, and the sample is arranged in the sealing sleeve; and a sealing assembly is arranged above the sample, a ventilating assembly is arranged below the sample, and hoops are arranged at the upper end and the lower end of the outer side of the sealing sleeve. According to the device and method, the porous material is fixed in the sealing device, quantitative real-time capture of gas pressure changes in the gas transmission process is achieved by means of a high-precision air pressure gauge in the gas transmission device, and the problem of quantitative testing of the porosity of the porous material based on the gas is solved.

Description

technical field [0001] The invention relates to a device and a method for testing the porosity of porous materials by using gas, in particular to the testing of the porosity of cement-based materials. Background technique [0002] Pore ​​structure is an important component of materials, and porous materials are related to all aspects of human life. As one of the members, cement-based materials are widely used, involving construction, transportation, bridges, water conservancy, underground engineering and other fields, and are the most important building materials today. The mesopore structure of cement-based materials provides an important place for cement hydration, which is not only related to the degree and rate of hydration, the type and quantity of hydration products, but also affects the mechanical properties and long-term performance of concrete. The characterization of the pore structure of cement-based materials provides theoretical support for its durability resea...

Claims

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Application Information

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IPC IPC(8): G01N15/08
CPCG01N15/088
Inventor 张云升石加顺钱如胜陈逸东钱佳佳吴飞龙
Owner SOUTHEAST UNIV