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Micron-sized particle stacking compactness testing device and testing method thereof

A particle accumulation and testing device technology, applied in measuring devices, specific gravity measurement, instruments, etc., can solve problems such as the inability to accurately measure the packing density of small particle size particles, the inability to completely eliminate the influence of particle clusters, and the prediction of rheological properties of mixtures, etc. , to achieve the effect of guaranteeing the final quality, increasing the maximum stress, and predicting the rheological properties

Active Publication Date: 2021-10-15
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the "wet method" still cannot completely eliminate the influence of particle clusters, and the judgment conditions are more subjective, and it is impossible to accurately measure the packing density of small particle size particles (especially micron-sized particles), and the test results cannot be combined with existing models. Good prediction of rheological properties of mixtures

Method used

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  • Micron-sized particle stacking compactness testing device and testing method thereof
  • Micron-sized particle stacking compactness testing device and testing method thereof
  • Micron-sized particle stacking compactness testing device and testing method thereof

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Embodiment

[0061] The test method for the packing density test device of micron-sized particles includes the following steps:

[0062] 1) Take the P·I 42.5 type reference cement as the particle to be tested, mix it with water and stir evenly to obtain a test slurry with a water-cement ratio of 0.3;

[0063] 2) Assemble a test device for packing density of micron-sized particles, pour the test slurry into the storage bin, so that the liquid level is located at the groove on the inner surface of the outer sleeve 2;

[0064] 3) Appropriately vibrate the test device to discharge the air bubbles introduced during the sample loading process;

[0065] 4) Put the piston 1 into contact with the surface of the test slurry, and place the test device on the loading platform of the universal testing machine;

[0066] 5) Edit the loading program so that the upper pressure head of the universal testing machine drops at a rate of 0.01-0.2mm / s first, and when the applied pressure reaches 90% of the set ...

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Abstract

The invention discloses a micron-sized particle stacking compactness testing device and a testing method thereof, and belongs to the technical field of material science and engineering, and the testing device comprises a piston, an outer sleeve, a filter membrane, a stainless steel filter screen, a perforated sheet, a sealing washer, a perforated supporting assembly, a liquid storage assembly and a demolding device. According to the testing device, filtering media with pore diameters and strength from small to large are combined to form the filtering assembly, so that the maximum bearable stress is greatly increased while the rejection rate is ensured, and the application range is enlarged. The invention further discloses the testing method of the device, the close packing state of the particles can be accurately judged, and the packing compactness of the micron-sized particles can be tested. According to the testing device and the testing method, the problems that the influence of particle clusters cannot be completely eliminated, critical condition judgment is subjective and the like in an existing method are solved, accurate testing of the micron-sized particle stacking compactness is achieved, and prediction of the rheological property of a solid-liquid mixture, optimization of the proportion and even guarantee of the final quality of the product in actual engineering are facilitated.

Description

technical field [0001] The invention belongs to the technical field of particle packing density testing, and in particular relates to a micron-sized particle packing density testing device and a testing method thereof. Background technique [0002] The process of using particles as raw materials to prepare products is widely used in various fields, such as: concrete, ceramics, metallurgy (powder metallurgy technology), etc. The accumulation state of particles is an important parameter that affects the quality and performance of its products. Taking concrete as an example, when aggregate and cement paste are mixed, part of the cement paste will enter the gap between the aggregates and lose its lubricating effect, while the other part of the paste can lubricate the surface of the particles, improving the rheological properties of the mixture. [0003] Therefore, by reducing the porosity of the solid mixture by adjusting the morphology and particle size distribution of the agg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N9/02
CPCG01N9/02
Inventor 刘加平俞晓涵舒鑫刘新王浩谢惟肖
Owner SOUTHEAST UNIV
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