Sealing material for impermeability tests

A technology for sealing materials and impermeability testing, which is applied in suspension and porous material analysis, permeability/surface area analysis, and measuring devices, etc. It can solve the problem that the impermeability pressure cannot meet the requirements, the height of the mortar specimen is small, and the specimen is uneven and other problems to achieve the effect of eliminating side leakage, remarkable sealing effect and easy operation

Active Publication Date: 2014-04-09
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After sealing with silica gel, it needs to be placed for more than 12 hours. At the same time, the test with high impermeability pressure cannot meet the requirements. Often, the test piece has edge leakage when the test is halfway through.
Moreover, this type of sealing material has a great impact on the cleanliness of the working environment, and the discarded materials after the test are not conducive to environmental protection.
[0007] Especially when doing the mortar impermeability test, because the height of the mortar specimen is small and the permeation path is short, it is very important to press the specimen into the steel mold in a balanced manner, but in actual operation, the specimen is often pressed in unevenly. Steel formwork, resulting in more common side leakage in mortar impermeability tests

Method used

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  • Sealing material for impermeability tests

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The cement and butter with a mass ratio of 2:1 are mixed uniformly to obtain a mixture A, and then the powder of sodium polyacrylate water-absorbing resin with a volume ratio of 1:1 is added to the mixture A and mixed uniformly to obtain the final sealing material. When in use, use a triangular knife to evenly scrape the sealing material on the side of the test piece, the thickness should be (1~2) mm, then put on the test mold and press the test piece in, so that the test piece is flush with the bottom of the test mold level. It can be immediately loaded into the impermeability instrument for pressurization.

Embodiment 2

[0028] First mix cement and butter evenly (mixture A), the mass ratio of cement and butter is 3:1, then add the powder of sodium polyacrylate water-absorbing resin to mixture A and mix it evenly, the volume ratio of mixture A and water-absorbing resin is 3 :1, get the final sealing material. When in use, use a triangular knife to evenly scrape the sealing material on the side of the test piece, the thickness should be (1~2) mm, then put on the test mold and press the test piece in, so that the test piece is flush with the bottom of the test mold level. It can be immediately loaded into the impermeability instrument for pressurization.

Embodiment 3

[0030] First mix cement and butter evenly (mixture A), the mass ratio of cement and butter is 4:1, then add sodium polyacrylate water-absorbing resin powder to mixture A and mix it evenly, the volume ratio of mixture A to water-absorbing resin is 6 :1, get the final sealing material. When in use, use a triangular knife to evenly scrape the sealing material on the side of the test piece, the thickness should be (1~2) mm, then put on the test mold and press the test piece in, so that the test piece is flush with the bottom of the test mold level. It can be immediately loaded into the impermeability instrument for pressurization.

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Abstract

The invention discloses a sealing material for impermeability tests, which belongs to the technical field of testing a building material and is used for carrying out impermeability tests of concrete and mortar. The sealing material is prepared by evenly mixing the traditional sealing material and water-absorbing resin powder. Hydrogel formed when the sealing material encounters water in the impermeability tests can plug a tiny gap between a test piece and a test mold, the proper water-absorbing resin can be selected to be doped according to the impermeability of the test piece, the lateral leakage phenomenon at the periphery of the test piece can be eliminated, the accuracy of a test result can be guaranteed, and the working efficiency can be improved. Compared with paraffin and silica gel, the sealing material for cement and grease in which the water-absorbing resin is added has the advantages of being more convenient to manufacture and use, simpler to operate, harmless to a human body, and environmentally friendly, wherein time-saving and effort-saving effects are achieved, and the economic benefits and social benefits are very remarkable.

Description

Technical field [0001] The invention relates to the technical field of detection of building materials, in particular to a sealing material used for impermeability tests of concrete and mortar. Background technique [0002] According to "Standard for Long-term Performance and Durability Test Methods of Ordinary Concrete" (GBT50082-2009) and "Standard for Basic Performance Test Methods of Building Mortar" (JGJ / T70-2009), the impermeability of concrete and mortar is used to evaluate its durability An important indicator, obtained through the impermeability test of concrete and mortar. [0003] In view of the test process of the impermeability test method, only the leakage of water through the interior of the specimen represents the impermeability of concrete and mortar. Therefore, in the test, water is not allowed to penetrate between the specimen and the test mold. Peripheral leakage, otherwise it will cause the test result to be untrue, so seal between the test piece and the test ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
Inventor 安雪晖姚国友
Owner TSINGHUA UNIV
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