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A material suitable for 3D printing concrete shear walls and its preparation method

A 3D printing and concrete technology, applied in the direction of additive processing, etc., can solve the problems of not meeting the performance requirements of rapid setting of materials, failing to meet the vertical accumulation performance of 3D printing, and the high cost of printing materials, so as to improve the setting time and early Strength, meet the requirements of mechanical properties, and good construction performance

Active Publication Date: 2022-04-19
山东中岩建材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the printing materials can meet the safety requirements of multi-storey or even small high-rise buildings in areas with an earthquake intensity of 7 degrees, the minimum compressive strength of materials suitable for building 3D printing must reach 20.0MPa, which must meet the requirements of high-rise and super high-rise buildings in the same earthquake intensity area. According to regional safety requirements, the compressive strength should reach above 35.0MPa. The standards for building 3D printing materials have been blank. Most of the foreign research on building 3D printing uses Portland cement and then adds admixtures for improvement. There is no problem with the printing effect at all, but the production cost of printing materials is very high, and it is unrealistic to popularize such a technology in an all-round way
[0005] The existing general Portland cement materials have a long setting time, usually 6 to 10 hours, and the final setting time is about 24 hours, which usually cannot meet the performance requirements of the rapid setting of the material in a short time during the 3D printing process; and the cement paste It is generally fluid and cannot meet the vertical stacking performance in the 3D printing process
In order to make the cement slurry meet the printing requirements, it is necessary to add a large amount of admixtures, which will lead to a significant increase in its cost, so it is not the best choice for architectural 3D printing materials

Method used

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  • A material suitable for 3D printing concrete shear walls and its preparation method
  • A material suitable for 3D printing concrete shear walls and its preparation method
  • A material suitable for 3D printing concrete shear walls and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031]Portland cement, sulphoaluminate cement, silica fume, quicklime, 20-40 mesh quartz sand, 50-80 mesh quartz sand, water reducer, retarder, dispersible latex powder, polypropylene short fiber and Water is used as the raw material, and the retarder is a mixture of citric acid and boric acid with a mass ratio of 1.2:1. The molar ratio of polycarboxylate superplasticizer raw materials is: methallyl polyoxyethylene ether: acrylic acid: thioglycolic acid: hydrogen peroxide: VC =1:4.2:0.13:0.23:0.03. Use the following steps to prepare a material suitable for 3D printing concrete shear walls:

[0032] 1) take each raw material by mass parts;

[0033] 2) Mix the water reducing agent and the setting retarder evenly and prepare them as admixtures for later use;

[0034] 3) Put sulphoaluminate cement, Portland cement, silica fume, quicklime, 20-40 mesh quartz sand, 50-80 mesh quartz sand into the mixer for mixing, after mixing evenly, add dispersible latex powder and polypropylene ...

Embodiment 2

[0044] The method suitable for 3D printing concrete shear wall materials is to mechanically transport the 3D printing concrete material prepared according to the mix ratio to the printing nozzle of the 3D printer, open the pre-designed model on the 3D printer operating platform, and click Start printing. Among them, the nozzle of the printer is 50mm, the printing height of a single layer is 30mm, the walking speed is 5cm / s, and the printing interval between layers is 60s.

[0045] Through the 3D printing test of the 3D printed concrete shear wall material of the present invention, the observation results: the printing time is controlled within 1 hour, there is no clogging during the printing process, the surface is smoother when extruded, the mechanical strength of the concrete is high, and the concrete shrinks less without cracks. The printing effect is good and the appearance is beautiful.

Embodiment 3

[0047] By adjusting the addition ratio of each raw material, use the jump table fluidity tester to test its fluidity, and use the cement mortar setting time tester to test its setting time. The No. 5 water reducer is a slow-release polycarboxylate water reducer. Test its fluidity with a table fluidity tester, and test its setting time with a cement mortar setting time tester. See Table 3 for the mix ratio and Table 4 for the test results.

[0048] Table 3 3D printing concrete shear wall material ingredient list

[0049]

[0050] Table 4 Test results of 3D printed concrete shear wall materials

[0051]

[0052] The test results of No. 5 and No. 6 show that if the slow-release polycarboxylate superplasticizer is used, or without the addition of sulphoaluminate cement and quicklime, the 3D printed concrete shear wall material presents the main problem of the fluidity of the 3D printed material. If it is too large, the viscosity is low, the early hydration reaction rate is ...

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Abstract

The present invention uses Portland cement, sulphoaluminate cement, silica fume, quicklime, 20-40 mesh quartz sand, 50-80 mesh quartz sand, water reducer, retarder, dispersible latex powder, polypropylene short Fiber and water are used as raw materials, and by adjusting the types of cementitious materials, admixtures, aggregates and admixtures, the preparation has high mechanical strength, good initial fluidity, convenient printing and construction, and achieves the strength and durability of concrete for high-rise buildings. Performance requirements, while ensuring the collapse resistance and aesthetics of the printed components, suitable for 3D printed concrete materials in cast-in-place construction operations.

Description

technical field [0001] The invention relates to the technical field of cement-based building materials, in particular to a material suitable for 3D walls with a shear force greater than concrete and a preparation method thereof. Background technique [0002] With the advancement of science and technology and the development of technology, 3D printing technology has advanced by leaps and bounds and entered various fields of the manufacturing industry. 3D printing technology refers to the use of a printer that can "print" a real three-dimensional object, using layered processing and superposition molding to add materials layer by layer to finally create a three-dimensional object. Since there are many forms of specific stacking, a variety of 3D printing processes have been produced, and the types of materials that can be printed by each process are different, but the basic principle is the same, that is, "layer-by-layer manufacturing, layer-by-layer stacking", also known as "...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/06B33Y70/10B33Y10/00
CPCC04B28/06B33Y70/00B33Y10/00C04B2111/00181C04B2201/50C04B7/02C04B22/064C04B14/06C04B2103/302C04B2103/22C04B2103/0057C04B16/0633
Inventor 曹虎毛岩鹏单立福仲从春李海燕陈梦龙杨振华王文龙
Owner 山东中岩建材科技有限公司
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