Wavy electromagnetic wave absorbing concrete structure based on 3 D printing

A technology of concrete structure and electromagnetic wave absorption, which is applied in the field of concrete, can solve the problems of large direct electromagnetic wave reflection on the surface, low electromagnetic wave absorption capacity of the surface layer, and inability to reflect electromagnetic waves multiple times, so as to achieve a high degree of automation, reduce reflected electromagnetic waves, and increase The effect of the number of reflections

Active Publication Date: 2019-03-26
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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  • Wavy electromagnetic wave absorbing concrete structure based on 3 D printing
  • Wavy electromagnetic wave absorbing concrete structure based on 3 D printing
  • Wavy electromagnetic wave absorbing concrete structure based on 3 D 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 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:

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

[0063]...

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 invention provides a wavy electromagnetic wave absorbing concrete structure based on 3 D printing. The wavy electromagnetic wave absorbing concrete structure is composed of layers of horizontal wavy concrete fins which are stacked in a laminated mode, the lamination height D between every two adjacent layers of concrete fins is 3-6 mm, and the lamination wavy depth K is 1-5 mm; and the width Tof each concrete fin is 10-15mm, and the wave orthogonal angle tan theta of the concrete fins is within the range of 1/3-1. According to the wavy electromagnetic wave absorbing concrete structure, a3 D printing technology is applied, thus the x, y and z axes all have uniform and regular wavy wave absorbing structures, and compared with a traditional single layer board structure, wavy special concrete can comprehensively lower electromagnetic wave echoes in multiple 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 Applications(China)
IPC IPC(8): C04B28/04B33Y10/00B33Y70/00
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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