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A wave-shaped electromagnetic absorbing concrete structure based on 3D printing

A technology of concrete structure and electromagnetic wave absorption, which is applied in the field of concrete, can solve the problems of simple space structure, large direct electromagnetic wave reflection on the surface, and low surface electromagnetic wave absorption ability, so as to increase the number of incidents and transmission distance, increase the loss probability, and automate high degree of effect

Active Publication Date: 2021-12-14
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the existing electromagnetic absorbing concrete is basically a flat plate structure (single-layer or multi-layer). Electromagnetic absorbing ability is low

Method used

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  • A wave-shaped electromagnetic absorbing concrete structure based on 3D printing
  • A wave-shaped electromagnetic absorbing concrete structure based on 3D printing
  • A wave-shaped electromagnetic absorbing concrete structure based on 3D printing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035]In the wave-shaped electromagnetic wave-absorbing concrete structure based on 3D printing in this embodiment, the distance H from the highest point to the lowest point of the horizontal wave shape is 45mm, D is 5.5mm, T is 12mm, K is 2.5mm, Tanθ is 1, that is, θ is 45°. Pump or mechanically transport the concrete slurry into the print nozzle of the 3D printer, and let it stand for 5 minutes. The rest time refers to the time between the preparation of the concrete and the start of printing. Set the outlet cross-sectional area of ​​the print nozzle to 120mm 2 , the horizontal printing speed is 175cm / min, the vertical printing speed is 0.7m / h, and the extrusion speed is 0.02m 3 / h then prints.

[0036] In this example, the concrete in the wave-shaped electromagnetic wave-absorbing concrete structure based on 3D printing is 3D-printable copper slag electromagnetic wave-absorbing concrete. The composition and content of the concrete are as follows in parts by weight:

[003...

Embodiment 2

[0060] Such as Figure 6 As shown, in the wave-shaped electromagnetic absorbing concrete structure based on 3D printing in this embodiment, H is 45mm, D is 5mm, T is 14mm, K is 1.8mm, and Tanθ is 2 / 3. The concrete is pumped or mechanically transported into the print head of the 3D printer, and the rest time is 7 minutes. The rest time refers to the time between the preparation of the concrete and the start of printing. The outlet cross-sectional area of ​​the print head is set to 150mm 2 , the horizontal printing speed is 170cm / min, the vertical printing speed is 0.6m / h, and the extrusion speed is 0.05m 3 / h, and then print.

[0061] In this embodiment, the concrete in the wave-shaped electromagnetic wave-absorbing concrete structure based on 3D printing is 3D-printable copper slag electromagnetic wave-absorbing concrete. The composition and content of the concrete are as follows in parts by weight:

[0062] 6.8 parts of 42.5# rapid hardening ordinary Portland cement;

[00...

Embodiment 3

[0085] Control 3D printed copper slag electromagnetic absorbing concrete, H is 90mm, D is 5.2mm, T is 15mm, K is 2mm, and Tanθ is 1 / 3. The concrete is pumped or mechanically transported to the print nozzle of the 3D printer, and the rest time is 6 minutes. The rest time refers to the time between the preparation of the concrete and the start of printing. The outlet cross-sectional area of ​​the print nozzle is set to 160mm 2 , the horizontal printing speed is 180cm / min, the vertical printing speed is 0.6m / h, and the extrusion speed is 0.02m 3 / h, and then print.

[0086] In this embodiment, the copper slag electromagnetic wave-absorbing concrete that can be printed in 3D is calculated in parts by weight, and the composition and content of the concrete are respectively:

[0087] 7.1 parts of 42.5# rapid hardening ordinary Portland cement;

[0088] 7.1 parts of quartz sand;

[0089] 1.75 parts of copper slag;

[0090] 0.85 parts of silica fume;

[0091] 0.18 parts of water ...

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Abstract

The present invention is a wave-shaped electromagnetic wave-absorbing concrete structure based on 3D printing. The concrete structure is composed of layers of horizontal wave-shaped concrete strips laminated and piled up. The lamination height D between two adjacent layers of concrete strips is 3. ~6mm, the depth K of the laminated wave shape is 1-5mm; the width T of each concrete strip is 10-15mm, and the wave orthogonal angle tanθ of the concrete strip is in the range of 1 / 3-1. The concrete structure uses 3D printing technology to make the x-y-z axis have a uniform and regular wave-shaped wave-absorbing structure. Compared with the traditional single-layer structure, the wave-shaped special concrete can reduce the electromagnetic wave echo in all directions. .

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a wave-shaped electromagnetic wave-absorbing concrete structure based on 3D printing. Background technique [0002] Architectural-grade 3D printing technology is developing day by day. It can use mechatronics technology to automatically print cement-based materials into the designed structure layer by layer. It is a new construction technology. The technology is fast, flexible, and efficient, and it has developed significantly in roads, bridges, buildings, and more. Due to the large degree of design freedom, low environmental pollution, fast construction speed, high construction flexibility, low labor cost and high degree of automation, this technology has been widely promoted. Concrete 3D printing technology can use various solid cementitious materials, carbon materials, metal materials and liquid chemical additives for the preparation of materials, which is conducive to impro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04B33Y10/00B33Y70/10
CPCC04B28/04B33Y10/00B33Y70/00C04B2111/00181C04B2111/00258C04B14/06C04B14/4643C04B18/146C04B18/144C04B22/04C04B2103/44
Inventor 马国伟孙浚博刘雄飞杨熙张宇晓
Owner HEBEI UNIV OF TECH
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