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Wave-absorbing foam concrete and preparation method for

A technology of foam concrete and wave absorbing agent, which is applied in the interdisciplinary field of building material science and electromagnetic science, can solve the problems of high cost, high density of wave absorbing materials, and inability to take into account thermal insulation performance, etc., and achieve low cost, wide absorption frequency band, and thermal insulation good performance

Inactive Publication Date: 2012-09-19
DALIAN 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 a wave-absorbing foam concrete, which can effectively solve the shortcomings of the current cement-based building wave-absorbing materials, such as high density, high cost, and inability to take into account thermal insulation performance.

Method used

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  • Wave-absorbing foam concrete and preparation method for

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] ① Mix 180g of micron carbonyl iron powder with 1620g of sulphoaluminate cement and stir evenly to obtain material I.

[0031] ②Mix 18g of animal and plant protein foaming agent with 126g of water, make foam for 3 minutes, and obtain foam;

[0032] ③ Mix material I, polycarboxylate high-efficiency water reducer and 770g water, and stir evenly to obtain a slurry;

[0033] ④ Add the foam to the slurry to mix, and stir evenly to obtain material II;

[0034] ⑤ Mold casting: inject material II into the mold, shake it flat, and cure it for 24 hours at a temperature of 20±2°C and a relative humidity of >95%;

[0035] ⑥ demoulding;

[0036] ⑦ Curing at 20±2°C and relative humidity >95% for 28 days for experimental testing.

[0037] The foam concrete specimen made; the absolute dry bulk density is 480kg / m 3 , The size of the microwave-absorbing performance test specimen is 200mm×200mm×25mm, and the size of the thermal insulation performance test specimen is 300mm×300mm×20mm. ...

Embodiment 2

[0039] 1. Mix 36g of micron carbonyl iron powder and 36g of nano-carbon black with 1368g of sulphoaluminate cement, and stir evenly to obtain material I.

[0040] ②Mix 16g of animal and vegetable protein foaming agent with 112g of water, and make foam for 3 minutes to obtain foam;

[0041] ③ Mix material I, polycarboxylate high-efficiency water reducer and 608g water, and stir evenly to obtain a slurry;

[0042] ④ Add the foam to the slurry to mix, and stir evenly to obtain material II;

[0043] ⑤ Mold casting: inject material II into the mold, shake it flat, and cure it for 24 hours at a temperature of 20±2°C and a relative humidity of >95%;

[0044] ⑥ demoulding;

[0045] ⑦ Curing at 20±2°C and relative humidity >95% for 28 days for experimental testing.

[0046] The foam concrete specimen made; the absolute dry bulk density is 500kg / m 3 , The size of the microwave-absorbing performance test specimen is 200mm×200mm×25mm, and the size of the thermal insulation performance...

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Abstract

The invention relates to a preparation method for wave-absorbing foam concrete. The preparation method comprises the following step of mixing cement, a physical foaming agent, a wave absorbing agent, a polycarboxylic-acid high-efficiency water reducing agent and water. The preparation method is characterized in that the wave absorbing agent is metal powder, ferrite, fiber, carbon black, crystal whisker or carbon nano tube, wherein the wave absorbing agent and water are mixed according to the mass ratio of 1-40:60-100. The wave-absorbing foam concrete is prepared by premixing the wave absorbing agent by an internal mixing method, mixing uniformly, adding foam and stirring, casting and molding and curing. The wave-absorbing foam concrete has the characteristics of simple molding process, low material density and good wave-absorbing performance.

Description

technical field [0001] The invention relates to a wave-absorbing foam concrete material and a preparation method thereof, and belongs to the cross technical field of building material science and electromagnetic science. Background technique [0002] The absorbing building material is a kind of building functional material that converts electromagnetic waves into other forms of energy and dissipates electromagnetic waves. It is of great significance in eliminating electromagnetic radiation hazards, reducing building energy consumption and stealth of military buildings. The main goal of traditional microwave absorbing materials is strong absorption, while new microwave absorbing materials are required to meet the requirements of "thin, light, wide and strong". At present, the research on cement-based wave-absorbing materials is mainly focused on adding wave-absorbing agents to cement-based materials to improve the electromagnetic properties and matching impedance of the entir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/02C04B28/06C04B22/04
Inventor 吕兴军曹明莉段玉平李妍
Owner DALIAN UNIV OF TECH
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