Double-layer cement-based wave-absorbing material with adjustable wave-absorbing performance and its application method

A technology of wave absorbing material and wave absorbing performance, which is applied in the field of double-layer cement-based wave absorbing material, can solve the problems that the wave absorbing performance of cement-based material can not meet the actual needs, the electromagnetic environment is complicated and fixed, and the application field can be broadened. and value, improving the absorbing frequency band, and the effect of flexible regulation

Active Publication Date: 2022-06-14
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cement-based absorbing materials prepared by traditional methods, once prepared, the absorbing properties of cement-based materials will remain unchanged
In the actual application process, the external electromagnetic environment is complex
When the external electromagnetic environment changes, the absorbing performance of cement-based materials will not meet the actual needs
At present, patents on adjustable double-layer cement-based absorbing materials are still very rare

Method used

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  • Double-layer cement-based wave-absorbing material with adjustable wave-absorbing performance and its application method
  • Double-layer cement-based wave-absorbing material with adjustable wave-absorbing performance and its application method
  • Double-layer cement-based wave-absorbing material with adjustable wave-absorbing performance and its application method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The present embodiment uses a cementitious material, a glass fiber tube and a nano Fe 3 O 4 As the main raw material, the specific preparation methods include:

[0026] (1) Will be nano Fe 3 O 4 Magnetic fluid is injected into a fiberglass tube and then sealed with resin for backup;

[0027] (2) Vitrified beads and cement dry mixed for 3min; Then add water to stir to get an impedance matching layer; Among them, the amount of vitrified beads is 10%, and the water-to-ash ratio is 0.35;

[0028](3) First dry mix cement and toner for 3min; Then prepare the absorption layer according to the preparation process of standard mortar, where the single-stage sand distribution (1.5~2.5mm) dosage is 300%, the toner dosage is 3%, and the water-ash ratio is 0.4;

[0029] (4) Using the method of layered pouring, first pouring the absorption layer 20mm, and then pouring the impedance matching layer 10mm to obtain a double-layer cement-based absorbing material; Wherein the upper and lower la...

Embodiment 2

[0031] The present embodiment uses a cementitious material, a glass fiber tube and a nano Fe 3 O 4 As the main raw material, the specific preparation methods include:

[0032] (1) Will be nano Fe 3 O 4 Magnetic fluid is injected into a fiberglass tube and then sealed with resin for backup;

[0033] (2) Vitrified beads and cement dry mixed for 3min; Then add water to stir to get an impedance matching layer; Among them, the amount of vitrified beads is 10%, and the water-to-ash ratio is 0.35;

[0034] (3) First dry mix cement and toner for 3min; Then prepare the absorption layer according to the preparation process of standard mortar, where the single-stage sand distribution (1.5~2.5mm) dosage is 300%, the toner dosage is 3%, and the water-ash ratio is 0.4;

[0035] (4) Using the method of layered pouring, first pour the absorption layer 10mm, and then pour the impedance matching layer 20mm to obtain a double-layer cement-based absorbing material; Where the upper and lower layers ar...

Embodiment 3

[0037] The present embodiment uses a cementitious material, a glass fiber tube and a nano Fe 3 O 4 As the main raw material, the specific preparation methods include:

[0038] (1) Will be nano Fe 3 O 4 Magnetic fluid is injected into a fiberglass tube and then sealed with resin for backup;

[0039] (2) Vitrified beads and cement dry mixed for 3min; Then add water to stir to get an impedance matching layer; Among them, the amount of vitrified microbeads is 5%, and the water-ash ratio is 0.35;

[0040] (3) First dry mix cement and toner for 3min; Then prepare the absorption layer according to the preparation process of standard mortar, where the single-stage sand distribution (1.5~2.5mm) dosage is 300%, the toner dosage is 3%, and the water-ash ratio is 0.4;

[0041] (4) Using the method of layered pouring, first pour the absorption layer 10mm, and then pour the impedance matching layer 20mm to obtain a double-layer cement-based absorbing material; Where the upper and lower layers a...

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Abstract

The invention belongs to the field of functional building materials, and discloses a preparation method of an adjustable double-layer cement-based wave-absorbing material. The controllable cement-based wave-absorbing materials are mainly double-layer cement-based materials, wave-transmitting tubes, Fe 3 o 4 Composed of ferrofluid and external magnetic field device. By applying an external magnetic field to the Fe-containing 3 o 4 The double-layer cement-based wave-absorbing material of the magnetic fluid wave-transmitting tube can change the Fe in the wave-transmitting tube 3 o 4 The existing form of magnetic fluid can change the electromagnetic parameters inside the cement-based absorbing material, and finally achieve the purpose of flexibly adjusting the absorbing performance of the cement-based material. The preparation method is simple and practical, and the obtained adjustable double-layer cement-based wave-absorbing material improves the characteristic that the traditional cement-based wave-absorbing material cannot be changed once formed, and further broadens the application field and scope of the cement-based wave-absorbing material. In practical application, when the external electromagnetic environment changes, only adjustable double-layer cement-based materials can meet the actual needs.

Description

Technical field [0001] The present invention belongs to the field of functional building materials, specifically relates to a double-layer cementitious absorbing material having controllable wave absorption properties and an application method thereof. Background [0002] As a carrier of information dissemination, electromagnetic waves are an important propagation medium. With the rapid development of electronic information technology, electromagnetic waves have been widely used in various fields, such as telephones, computers, microwave ovens, satellites, radar, etc. The widespread application of electromagnetic waves has greatly improved people's quality of life. However, the presence of a large number of electromagnetic waves is not only harmful to human health, but also the excess electromagnetic waves can interfere with the operation of precision instruments. In addition, electromagnetic leakage also seriously affects personal privacy and national security. Therefore, the re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2111/00258C04B14/24C04B14/42C04B14/308C04B14/022
Inventor 李方贤任蒙蒙余其俊韦江雄胡捷张同生黄浩良
Owner SOUTH CHINA UNIV OF TECH
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