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A 3D printing geopolymer for physical model of complex rock mass and its application method

A physical model, 3D printing technology, used in the preparation of test samples, cement production, additive processing, etc. problems, to achieve excellent particle size gradation distribution, dense laying, and good powder spreading effect.

Active Publication Date: 2022-01-28
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, geopolymer materials have not been widely used in the above-mentioned powder bonding 3D printing technology. The main problem is that the activator used in it has a high viscosity and cannot be directly used as a binder for printing through nozzle jetting.
Moreover, the binder ejected during the powder bonding 3D printing process is difficult to distribute evenly in the existing geopolymer powder, which makes the existing geopolymer materials not suitable for powder bonding 3D printing

Method used

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  • A 3D printing geopolymer for physical model of complex rock mass and its application method
  • A 3D printing geopolymer for physical model of complex rock mass and its application method
  • A 3D printing geopolymer for physical model of complex rock mass and its application method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A powder-bonded 3D printing geopolymer composite material for complex rock mass physical models, in parts by weight, the composition and content of the geopolymer are:

[0046] 0.5 part of fly ash, 0.5 part of blast furnace slag powder, 0.5 part of quartz powder, 0.2 part of sodium silicate powder, 0.03 part of PVA powder, 0.01 part of sodium hydroxide powder, 0.003 part of pyrrolidone liquid, 0.002 part of absolute ethanol, 0.25 part of water .

[0047] The loss on ignition of the fly ash is 8.2%, the moisture content is 0.08%, the fineness is 26.5% after sieving through a 45 μm square hole sieve, and the maximum particle size is 0.1 mm.

[0048] The density of the blast furnace slag powder is 2.8g / cm 3 , the specific surface area is 350m 2 / kg, the moisture content is 0.3%, and the maximum particle size is 85μm.

[0049] The modulus of described sodium silicate powder is 3.2, and density is 2.6g / cm 3 .

[0050] The PVA powder is 325 mesh, and the density is 1.19~...

Embodiment 2

[0062] A powder-bonded 3D printing geopolymer composite material for complex rock mass physical models, in parts by weight, the composition and content of the geopolymer are:

[0063] 0.5 part of fly ash, 0.5 part of blast furnace slag powder, 0.5 part of quartz powder, 0.2 part of sodium silicate powder, 0.03 part of PVA powder, 0.01 part of sodium hydroxide powder, 0.005 part of anhydrous sodium metasilicate powder, 0.003 part of pyrrolidone solution , 0.002 parts of absolute ethanol, 0.25 parts of water.

[0064] The loss on ignition of the fly ash is 8.2%, the moisture content is 0.08%, the fineness is 26.5% after sieving through a 45 μm square hole sieve, and the maximum particle size is 0.1 mm.

[0065] The density of the blast furnace slag powder is 2.8g / cm 3 , the specific surface area is 350m 2 / kg, the moisture content is 0.3%, and the maximum particle size is 85μm.

[0066] The modulus of described sodium silicate powder is 3.2, and density is 2.6g / cm 3 .

[00...

Embodiment 3

[0080] A powder-bonded 3D printing geopolymer composite material for complex rock mass physical models, in parts by weight, the composition and content of the geopolymer are:

[0081] 0.5 part of fly ash, 0.5 part of blast furnace slag powder, 0.5 part of quartz powder, 0.2 part of sodium silicate powder, 0.03 part of PVA powder, 0.01 part of sodium hydroxide powder, 0.005 part of anhydrous sodium metasilicate powder, 0.003 part of pyrrolidone solution , 0.002 parts of absolute ethanol, 0.25 parts of water.

[0082] The loss on ignition of the fly ash is 8.2%, the moisture content is 0.08%, the fineness is 26.5% after sieving through a 45 μm square hole sieve, and the maximum particle size is 0.1 mm.

[0083] The density of the blast furnace slag powder is 2.8g / cm 3 , the specific surface area is 350m 2 / kg, the moisture content is 0.3%, and the maximum particle size is 85μm.

[0084] The modulus of described sodium silicate powder is 3.2, and density is 2.6g / cm 3 .

[00...

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Abstract

The invention discloses a 3D printing geopolymer used for complex rock mass physical models and a method for using the same. It consists of fly ash, blast furnace slag powder, quartz powder, alkali activator powder, PVA powder, strong It consists of sodium metasilicate powder, pyrrolidone solution, cooling liquid and water. The alkali activator powder can be one of sodium silicate powder and potassium silicate powder. The strong alkali powder can be one of sodium hydroxide powder and potassium hydroxide. The cooling liquid can be one of absolute ethanol, isopropanol and glycerol. The invention has excellent particle size gradation distribution and good powder spreading effect; the viscosity of the binder is small, and the sprayed binder can be uniformly distributed in the existing geopolymer powder; by controlling the concentration of the binder and Components can realize the preparation of multi-strength rock materials and physical models of complex rock masses. The invention also provides a method for powder bonding 3D printing using the geopolymer composite material.

Description

technical field [0001] The invention relates to the fields of geotechnical engineering and inorganic materials, in particular, to a powder-bonded 3D printing geopolymer for complex rock mass physical models and a method for using the same. Background technique [0002] The construction of major infrastructure and energy projects is a major demand for the country's sustainable development. All kinds of safety accidents and geological disasters in these projects are closely related to the complex rock mass structure. Studying the catastrophe mechanism and failure characteristics of complex rock mass structure is the basis for ensuring the safety of major infrastructure and energy projects. The physical model test is the main research method in the field of geotechnical engineering. However, due to the presence of rock materials of various strengths in the complex rock mass, and the presence of discontinuities and surfaces such as cracks, there is currently no mature method in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00B33Y70/10B33Y10/00G01N1/28G01N33/24
CPCC04B28/006B33Y70/10B33Y10/00G01N1/28G01N33/24C04B2201/50C04B2111/00181C04B18/08C04B18/141C04B14/06C04B22/00C04B24/2623C04B22/062C04B24/12C04B24/026C04B20/0076Y02P40/10
Inventor 马国伟李之建范立峰
Owner BEIJING UNIV OF TECH
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