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Three-dimensional fixed-pore artificial porous stone preparation method

An artificial and pore technology, applied in the field of rock and soil testing, can solve problems such as single bubble shape, single pore shape, and variable bubble shape, and achieve the effects of reducing the difference in internal pore structure, reducing test deviation, and improving test accuracy

Active Publication Date: 2021-08-13
CHONGQING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, none of the above methods can generate a sample group with the same internal pore structure characteristics, and it is either difficult to accurately quantify the internal pore structure, or the pore shape is single, or the preparation cost is high
It is impossible to prepare a fixed-porosity rock-like porous media sample group that satisfies the given three-dimensional pore shape, porosity, and pore specific surface at the same time.
[0004] 1. It is difficult to quantitatively describe the internal pore structure characteristics
[0005] Usually, the porous medium is directly equivalent to the continuous medium through the characterization volume unit REV, which cannot quantitatively describe the important pore parameters such as pore shape, pore distribution, porosity, and pore specific surface; while the CT of the porous medium sample The method of scanning and reconstructing the internal pore structure of porous media in 3D is difficult to be popularized in actual routine tests due to the cost of CT scanning and the labor cost of subsequent processing; in rock-like artificial porous media filled with bubbles, the size of the bubbles varies greatly, and the shape of the bubbles varies greatly. It is also difficult to directly and quantitatively describe the characteristics of the internal pore structure
[0006] 2. There are obvious differences in the pore structure of the samples in the test
[0007] Due to the difference in the pore structure of the samples in the test and the damage of the pore structure in the sampling process, the pore structure of the samples in the same group of tests is obviously different from sample to sample. Even if the internal pore structure of all samples is accurately obtained, the pore The obvious difference in structure increases the difficulty and accuracy of test result analysis
[0008] 3. The cost of sample preparation and internal pore structure generation is high
[0009] In the test, direct sampling of rock-like porous media requires coring, grinding and shaping of the sample, and the cost of sample preparation for a single sample is also about 100 RMB; at the same time, the cost of CT scanning of the sample, 3D internal pore structure reconstruction Expenses and labor costs are high
[0010] 4. It is impossible to prepare fixed-porosity rock-like porous media samples that satisfy the given 3-dimensional pore shape, porosity, and pore specific surface at the same time
[0011] At present, the method of adding air bubbles is used in the preparation of artificial porous media. Because the shape of the bubbles is relatively single and the size difference is large, the pore shape, porosity, and pore ratio are difficult to control, and it is difficult to generate three-dimensional fixed-pore artificial porous stones. Therefore, it is urgent to find new ones. Preparation method of three-dimensional fixed-pore artificial porous stone

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0055] Preparation of three-dimensional fixed-pore artificial porous stone with regular pore morphology:

[0056] (1) Directly select common and easily available glass products as regular glass hole templates, such as figure 1 shown;

[0057] (2) Preparation of a flexible mold with holes: First, mix flexible silica gel with water at a mass ratio of 100:1 to prepare a flexible airless silica gel solution, pour it into a mold preparation box and cover the glass hole template for more than 2mm; then The glass hole templates are put into the silica gel solution one by one at equal intervals, so that the glass hole templates sink into the silica gel solution and contact with the silica gel solution and the bottom of the model box to form small grouting holes on the top of the flexible mold; after the silica gel is solidified and formed, the flexible silica gel The mold is taken out from the mold preparation box, and the glass balls are in contact with the mold preparation box to f...

Embodiment 2

[0063] Preparation of three-dimensional fixed-pore artificial porous stone with arbitrary pore shape:

[0064] (1) Obtain the morphological parameters of any hole through 3D scanning or three-dimensional modeling by computer, and prepare the hole template by using 3D printing and other methods to obtain the morphological parameters of any hole;

[0065] (2) Preparation of flexible molds with holes: First, mix flexible silica gel with water to prepare a flexible airless silica gel solution according to the mass ratio of 100:1.3, and pour it into the mold preparation box; secondly, for templates with a density greater than the silica gel solution, use With sufficient stencil spacing, put the hole stencils into the silica gel solution one by one, and the stencils will finally sink to the bottom of the mold preparation box and contact the bottom mold preparation box. For the hole template with a density approximately equal to that of the silica gel solution, the hole template can ...

Embodiment 3

[0071] Preparation of three-dimensional fixed-pore artificial porous stone with natural pore morphology:

[0072] (1) Select rocks with natural pores exposed, and inject epoxy resin from the exposed holes. After the resin is hardened, put the resin-injected rocks into hydrochloric acid solution, and corrode and ablate the excess rocks through hydrochloric acid solution to obtain different Resin pore model reflected with acidic solution;

[0073] (2) Prepare a flexible mold with holes: mix flexible silica gel with water according to the mass ratio of 100:1.5 to prepare a flexible airless silica gel solution, and pour it into the mold preparation box; secondly, for templates with a density greater than that of the silica gel solution, use enough stencil spacing, put the hole stencils into the silica gel solution one by one, and the stencils will finally sink to the bottom of the mold preparation box and contact the bottom mold preparation box. For the hole template with a densi...

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Abstract

The invention discloses a method for preparing a three-dimensional fixed-pore artificial porous stone, which belongs to the field of rock and soil testing. The preparation method of the present invention goes through the following steps: S1: prepare the hole template; S2: prepare the hole flexible mold according to the hole template; S3: prepare the three-dimensional agar hole model; S4: prepare the agar porous stone; S5: degrease the porous stone by circulating water The obtained porous stone is degreased by circulating water boiling. The preparation method of the present invention can produce artificial porous stone with specific material with specific pore shape, pore content, and pore size efficiently, quickly and at low cost under the conditions of given artificial stone slurry ratio and pore shape, size and ratio. , so as to solve the problem that the specific three-dimensional simulation artificial porous stone cannot be prepared in the current laboratory test.

Description

technical field [0001] The invention belongs to the field of rock and soil tests, and relates to a method for preparing a three-dimensional fixed-pore artificial porous stone. Background technique [0002] Porous medium refers to a multiphase mixed medium composed of a rock-like solid skeleton and a large number of pores inside the skeleton. It exists widely in nature. Rock-like porous media are mainly concrete, bricks, and various rocks, rock masses and other rock-like materials. Because there are a large number of connected and non-connected pore spaces with complex shapes and different distributions in porous media, it is difficult to accurately describe the internal structure of porous media regardless of natural or artificial porous media. However, the pore shape, porosity, pore specific area, and pore structure characteristics such as connectivity and non-connection of pores in porous media greatly affect the physical properties of porous media such as permeability, he...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/36
CPCG01N1/36G01N2001/366
Inventor 杜立兵刘新荣何伟蔡白洁
Owner CHONGQING UNIV