Test method for testing gas permeability of concrete through concrete tube test specimen

A technology of gas permeability and test method, which is applied in the field of gas permeability test of concrete materials, and can solve the problems of strict test steps and complicated procedures.

Active Publication Date: 2019-07-09
63653 FORCES PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that the test steps are strict and the procedure is complicated
[0003] The above literatures listed above show that the test of the gas permeability of concrete materials at hom...

Method used

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  • Test method for testing gas permeability of concrete through concrete tube test specimen
  • Test method for testing gas permeability of concrete through concrete tube test specimen
  • Test method for testing gas permeability of concrete through concrete tube test specimen

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Experimental program
Comparison scheme
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Embodiment

[0015] Embodiment: The concrete mixture was prepared according to the mass ratio values ​​shown in Table 1, poured into the concrete pipe prefabricated mold for casting, demolded after 1 day, and cured under standard conditions.

[0016] Table 1 Concrete pipe material mix ratio

[0017]

[0018] Connect the prepared concrete pipe into the concrete pipe test device, and after the air pressure in the concrete pipe is inflated to more than 20 kPa higher than the ambient air pressure, the pressure difference between the inside and outside of the concrete pipe changes with time as follows: image 3 shown.

[0019] According to the experimental observation data, a one-dimensional model was established, and the gas permeability of this concrete material was obtained by numerical simulation inversion, which was 8.0×10 -16 m 2 .

[0020] The invention uses a concrete pipe material test piece to test the gas permeability of concrete, which can monitor the change of the air pressur...

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Abstract

The invention belongs to the field of building materials, and discloses a test method for testing the gas permeability of concrete through a concrete tube test specimen. The test method includes the steps that the concrete tube test specimen is manufactured through a concrete tube precast mold, and the test specimen is cured under the standard conditions; a concrete tube testing device is assembled; a concrete tube is first filled with a certain amount of gas, an inflatable opening and a joint of the device are subjected to leakage detecting through a soap bubble method, and it is ensured thatthe air tightness of the device is good; the concrete tube is filled with a certain amount of gas, and the change situation of the air pressure difference inside and outside the concrete tube with the time is monitored in real time through a pressure sensor; and modeling is conducted on a test system through COMSOL Multiphysics software, test data are input into a modeling model for comparison, and then the gas permeability of the concrete tube wall, that is, a concrete material is calculated. According to the test method for testing the gas permeability of the concrete through the concrete tube test specimen, the change situation of the air pressure difference inside and outside the concrete tube with the time can be monitored, and the gas permeability of the concrete material is calculated through numerical simulation.

Description

technical field [0001] The invention belongs to the field of building materials and relates to the test of the gas permeability of concrete materials. The provided test device can accurately measure the gas permeability of concrete materials and has important practical value. Background technique [0002] Concrete is a porous material. The existence of pores strongly affects its strength, toughness and other properties. The pore structure inside concrete is closely related to its durability performance such as permeability, air tightness and corrosion resistance. Permeability is one of the main indicators of concrete durability. At present, two types of permeable media are mainly used in the determination of this property: water and gas. When water is used as the infiltration medium, the infiltration process is difficult to reach a steady state due to the continuous hydration of cement, the migration of substances, and the change of capillary structure. Therefore, it is diff...

Claims

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Application Information

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IPC IPC(8): G01N7/10G01N15/08
CPCG01N7/10G01N15/0826
Inventor 不公告发明人
Owner 63653 FORCES PLA
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