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A 3D printing method for complex shaped concrete products

A technology for concrete products and complex shapes, applied in the field of 3D printing, can solve problems such as difficult to obtain mechanical properties, limited strength of components, and artificial support

Active Publication Date: 2021-07-06
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of additive manufacturing has to deal with a problem: in order to print complex structures, manual support is required during the printing process
However, in such a molding process, there is no aggregate, only cementitious materials, which is not considered as concrete 3D printing in the true sense, and the limited strength of the binder leads to limited strength of the parts, making it difficult to obtain products with excellent mechanical properties.

Method used

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  • A 3D printing method for complex shaped concrete products
  • A 3D printing method for complex shaped concrete products
  • A 3D printing method for complex shaped concrete products

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A 3D printing preparation method for concrete products with complex shapes, the raw materials include 42.5 Portland cement, 1mm particle size quartz sand, admixtures (anhydrous sodium sulfate, methyl cellulose, polycarboxylate high-performance water-reducing agent) and water, the preparation steps are as follows:

[0027] 1) After slicing the cylindrical hollow shape with a diameter of 40mm and a height of 10mm through the software (Repetier), input the slicing program to the 3D printer;

[0028] 2) Mixing and stirring of cement slurry: Weigh the dry powder raw materials according to the following weight ratios: 100 parts of 42.5 Portland cement, 2 parts of anhydrous sodium sulfate, 1 part of polycarboxylate high-performance water reducer, methyl cellulose 1 part, according to the water-binder ratio of 0.35 to prepare cement paste (fluidity tested according to GBT 8077-2012 is 100mm, according to JGJ / T70-2009 test water retention is 96%), first in the configuration proc...

Embodiment 2

[0032] A 3D printing preparation method for complex-shaped concrete products, the raw materials include 42.5 Portland cement, 1.5mm particle size quartz sand, admixtures (anhydrous sodium sulfate, methyl cellulose, polycarboxylate high-performance Aqua) and water, the preparation steps are as follows:

[0033] 1) After slicing a cube with a side length of 40mm through the software (Repetier), input the slicing program to the 3D printer;

[0034] 2) Mixing of cement slurry: Weigh dry powder raw materials according to the following weight ratios: 100 parts of 42.5 Portland cement, 1 part of anhydrous sodium sulfate, 1 part of polycarboxylic acid-based high-performance water reducer, methyl cellulose 0.5 parts, prepared according to the water-binder ratio of 0.38 to obtain cement paste (the fluidity tested according to GBT 8077-2012 is 120mm, and the water retention according to JGJ / T70-2009 is 90%). The dry powder components (42.5 Portland cement, admixtures) were mixed for 2 m...

Embodiment 3

[0037]A 3D printing preparation method for concrete products with complex shapes, the raw materials include 42.5 Portland cement, 1mm particle size quartz sand, admixtures (anhydrous sodium sulfate, methyl cellulose, polycarboxylate high-performance water-reducing agent) and water, the preparation steps are as follows:

[0038] 1) After slicing a square hollow shape with a side length of 40mm and a height of 10mm through the software (Repetier), input the slicing program to the 3D printer;

[0039] 2) Mixing and stirring of cement slurry: Weigh the dry powder raw materials according to the following parts by weight: 100 parts of 42.5 Portland cement, 2 parts of anhydrous sodium sulfate, 2 parts of polycarboxylic acid-based high-performance water reducer, methyl cellulose 1 part, prepared according to the water-binder ratio of 0.36 to obtain cement paste (the fluidity tested according to GBT 8077-2012 is 100mm, and the water retention measured according to JGJ / T70-2009 is 97%)....

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Abstract

The invention relates to a 3D printing method for concrete products with complex shapes. The specific steps are as follows: 1) Input the concrete product model slicing program into the 3D printer; 2) Weigh dry powder raw materials: 42.5 Portland cement or rapid hardening sulfoaluminic acid 100 parts of salt cement, 0.1-2 parts of early-strength agent, 0.5-5 parts of water-reducing agent, 0.5-5 parts of thickener, and prepare cement slurry according to the water-binder ratio of 0.3-0.5; 3) Spread the aggregate powder , spray the cement slurry with the corresponding cross-sectional shape of the model, and stack it layer by layer until the concrete product model is formed, and then dry, polish and polish the model to obtain the concrete product. The invention adopts the rapid manufacturing process of selective impregnation forming, and the cement paste uniformly penetrates into the aggregate and then performs hydration as an adhesive to tightly combine the aggregate, and the obtained concrete product has high density and good performance.

Description

technical field [0001] The invention belongs to the technical field of 3D printing, and in particular relates to a 3D printing method for complex-shaped concrete products. Background technique [0002] Since 1980, the field of 3D printing manufacturing has grown substantially, and many materials such as polymer materials, biomaterials, metal materials, ceramic materials, etc. have made use of this technology. Concrete 3D printing manufacturing is a promising new technology in the concrete construction industry that replaces traditional construction methods. 3D printing-manufactured prefabricated components have been produced on a laboratory scale. This technology can be used to manufacture walls or design structural parts. 3D printing is the process of shaping a workpiece by adding materials layer by layer. [0003] In concrete construction, the combination of additive manufacturing and concrete materials can save construction period, reduce construction cost and reduce pol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B28/06B28B1/00B33Y70/10B33Y80/00B33Y10/00
Inventor 刘凯刘欣宇黄尚宇段少强水中和黄赟
Owner WUHAN UNIV OF TECH