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A kind of electromagnetic absorbing concrete and its preparation method

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

Inactive Publication Date: 2018-03-20
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 absorbing efficiency and poor mechanical properties of the existing absorbing concrete and other shortcomings, and the preparation method involved is simple, suitable for popularization and application

Method used

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  • A kind of electromagnetic absorbing concrete and its preparation method
  • A kind of electromagnetic absorbing concrete and its preparation method
  • A kind of electromagnetic absorbing concrete and its preparation method

Examples

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Effect test

Embodiment 1

[0026] An electromagnetic wave-absorbing concrete, the volume percentages of wave-absorbing functional ceramsite (aggregate) and wave-absorbing cement slurry are respectively 40% and 60%; The percentage of volume is 15%, and its preparation method includes the following steps:

[0027] 1) Preparation of wave-absorbing functional ceramsite: the clay, titanium dioxide, magnesium carbonate and sodium sulfate are weighed in mass percentages of 60%, 30%, 5% and 5% respectively, and are mixed, granulated and fired in sequence (Rise to 1280°C at a rate of 20°C / min, calcinate at a constant temperature for 10 minutes, and cool down to room temperature with the furnace) to obtain wave-absorbing functional ceramsite with a cylinder compressive strength of 7.3 MPa, a particle size of 2 to 5 mm, and an apparent density of 1.45g / cm 3 .

[0028] 2) Pretreatment of wave absorbing functional ceramsite: Calculate the mass of the wave absorbing functional ceramsite according to the volume cont...

Embodiment 2

[0037] An electromagnetic wave-absorbing concrete, the volume percentages of wave-absorbing functional ceramsite (aggregate) and wave-absorbing cement slurry are respectively 70% and 30%; wherein the volume percentage of nano-titanium dioxide (wave absorbing agent) in the volume of wave-absorbing cement slurry is: 3%, and its preparation method includes the following steps:

[0038] 1) Preparation of wave-absorbing functional ceramsite: the clay, titanium dioxide, magnesium carbonate and sodium sulfate are weighed in mass percentages of 85%, 10%, 3% and 2%, respectively, and are mixed, granulated and fired in sequence (Rise to 1120°C at a rate of 5°C / min, calcinate at a constant temperature for 45 minutes, and cool down to room temperature with the furnace) to obtain wave-absorbing functional ceramsite 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 wave absorbing functional ceram...

Embodiment 3

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

[0049] 1) Preparation of wave-absorbing functional ceramsite: the clay, titanium dioxide, magnesium carbonate and sodium sulfate are weighed at 77%, 20%, 2% and 1% by mass, and mixed, granulated and fired in sequence (Rise to 1200°C at a rate of 10°C / min, calcinate at a constant temperature for 30 minutes, and cool down to room temperature with the furnace) to obtain wave-absorbing functional ceramsite 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 wave absorbing functional ceramsite: Ca...

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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 interdisciplinary technical field of building material science and electromagnetic science, and particularly relates to an electromagnetic wave absorbing concrete and a preparation method thereof. Background technique [0002] The traditional electromagnetic wave absorbing concrete is a kind of concrete with a certain electromagnetic wave absorbing function by mixing the wave absorbing agent into the cement paste. It mainly relies on the wave absorbing functional component (wave absorbing agent) mixed into the concrete, which uses its dielectric loss, magnetic loss and other effects to lose the electromagnetic wave energy so that the incident electromagnetic wave is absorbed. Absorbers commonly used in absorbing concrete mainly include carbon-based conductive materials, ferrites, nanomaterials, chiral bodies, etc. However, the electromagnetic wave absorbing concrete prepared by this method still has some deficiencies: firs...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B18/02C04B14/30C04B14/10C04B22/10C04B22/14
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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