Electromagnetic wave absorption concrete and production method thereof

A technology of electromagnetic wave absorption and concrete, which is applied in the cross field of building material science and electromagnetic science, can solve the problems of low wave absorption efficiency, narrow effective frequency band, poor mechanical properties, etc., and achieve the effect of increasing the space action area

Inactive Publication Date: 2017-01-04
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide an electromagnetic absorbing concrete and its preparation method, which can effectively overcome the narrow effective frequency band, low abs

Method used

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  • Electromagnetic wave absorption concrete and production method thereof
  • Electromagnetic wave absorption concrete and production method thereof
  • Electromagnetic wave absorption concrete and production method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] An electromagnetic wave-absorbing concrete, the volume percentages of wave-absorbing ceramsite (aggregate) and wave-absorbing cement slurry are 40% and 60% respectively; wherein manganese-zinc ferrite powder (wave-absorbing agent) accounts for The percentage by volume is 15%, and its preparation method comprises the following steps:

[0027] 1) Preparation of microwave-absorbing ceramsite: Weigh clay, titanium dioxide, magnesium carbonate and sodium sulfate at 60%, 30%, 5% and 5% by mass respectively, and then mix, granulate and fire in sequence (Heat up to 1280°C at a rate of 20°C / min, calcine at a constant temperature for 10min, and cool to room temperature with the furnace), and the wave-absorbing functional ceramsite is obtained, with a cylinder compressive strength of 7.3MPa, a particle size of 2-5mm, and an apparent density of 1.45g / cm 3 .

[0028] 2) Pretreatment of the wave-absorbing ceramsite: calculate and weigh the mass of the wave-absorbing ceramsite accor...

Embodiment 2

[0037] A kind of electromagnetic wave-absorbing concrete, the wave-absorbing function ceramsite (aggregate) and wave-absorbing cement slurry account for 70% and 30% respectively by volume; 3%, its preparation method comprises the following steps:

[0038] 1) Preparation of microwave-absorbing ceramsite: Weigh clay, titanium dioxide, magnesium carbonate and sodium sulfate at a mass percentage of 85%, 10%, 3% and 2%, respectively, and perform mixing, granulation, and firing in sequence (Heating up to 1120°C at a rate of 5°C / min, calcining at a constant temperature for 45min, and cooling to room temperature with the furnace), the microwave-absorbing functional ceramsite was obtained, with a cylinder compressive strength of 9.8MPa, a particle size of 5-10mm, and an apparent density of 1.37 g / cm 3 .

[0039] 2) Pretreatment of the wave-absorbing ceramsite: calculate and weigh the mass of the wave-absorbing ceramsite according to the volume content of the wave-absorbing ceramsite ...

Embodiment 3

[0048] An electromagnetic wave-absorbing concrete, the volume percentages of wave-absorbing functional ceramsite (aggregate) and wave-absorbing cement slurry are 50% and 50% respectively; wherein high-structure carbon black (wave-absorbing agent) accounts for 50% of the volume of wave-absorbing cement slurry Percentage is 8%, and its preparation method comprises the following steps:

[0049] 1) Preparation of microwave-absorbing ceramsite: Weigh clay, titanium dioxide, magnesium carbonate and sodium sulfate at a mass percentage of 77%, 20%, 2% and 1%, respectively, and perform mixing, granulation, and firing in sequence (heat up to 1200°C at a rate of 10°C / min, calcine at a constant temperature for 30min, and cool to room temperature with the furnace), and the microwave-absorbing functional ceramsite is obtained, with a cylinder compressive strength of 9.9MPa, a particle size of 8-12mm, and an apparent density of 1.42 g / cm 3 .

[0050] 2) Pretreatment of the wave-absorbing c...

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Abstract

The invention discloses an electromagnetic wave absorption concrete and a production method thereof. The electromagnetic wave absorption concrete comprises 30-70% of wave absorption functional ceramsite and 30-70% of wave absorption cement mortar. The wave absorption functional ceramsite is adopted as aggregate, and a wave absorbing agent is added to the wave absorption cement mortar, so the wave absorption functional ceramsite and the wave absorption cement mortar have electromagnetic wave absorption functions and good electromagnetic wave absorption usefulness. The electromagnetic wave absorption concrete produced in the invention effectively solves the disadvantages of narrow effective action frequency range, low wave absorption usefulness and poor mechanical performances of present wave absorption concrete, the maximum reflectivity of the concrete in a 8-18 GHz frequency range is -11.1 - -14.5 dB, and the frequency range width is 5.9-6.7 dB when the 8-18 GHz reflectivity is smaller than -10 dB; and the concrete also has good mechanical performances, has a 28 d compressive strength reaching 60 MPa, and can be used as a structure bearing material.

Description

technical field [0001] The invention belongs to the intersecting technical field of building material science and electromagnetic science, and in particular relates to an electromagnetic wave-absorbing concrete and a preparation method thereof. Background technique [0002] Traditional electromagnetic absorbing concrete is a kind of concrete with a certain electromagnetic absorbing function by mixing absorbing agent into cement paste. It mainly relies on the absorbing functional component (absorbing agent) mixed in the concrete, and uses its dielectric loss, magnetic loss, etc. to lose electromagnetic wave energy and absorb the incident electromagnetic wave. The wave absorbing agents commonly used in wave-absorbing concrete mainly include carbon-based conductive materials, ferrite, nanomaterials, chiral bodies, etc. However, there are still some shortcomings in the electromagnetic absorbing concrete prepared by this method: first, the absorbing agent is only filled in the c...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B14/04C04B33/13
Inventor 何永佳胡曙光平兵吕林女王发洲李广锋肖培浩
Owner WUHAN UNIV OF TECH
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