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Cement-based wave-absorbing material prepared by compounding ferroferric oxide and fly-ash hollow microspheres and preparation method thereof

A technology of ferroferric oxide and hollow microspheres, applied in chemical instruments and methods, and other chemical processes, can solve problems affecting the fluidity of freshly mixed cement paste, the wave-absorbing performance of constructive cement-based materials, and the wave-absorbing properties of cement-based materials. Problems such as high material density and uneven dispersion can achieve the effect of improving freshly mixed work performance, reducing bulk density and improving slurry fluidity

Inactive Publication Date: 2017-08-11
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditional microwave-absorbing functional cement-based materials are usually made of Fe 3 o 4 Powder, etc. are mixed into cement paste as a wave-absorbing component, but there are obvious technical problems: first, these Fe 3 o 4 The amount of powder added is relatively large, generally more than 15% to 30% by mass of cement, resulting in high density and low strength of the prepared cement-based wave-absorbing material; the second is Fe 3 o 4 The powder is mixed in the cement mixing process, the dispersion is uneven, and it is easy to agglomerate, which seriously affects the fluidity, workability and wave-absorbing performance of the cement-based material prepared.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A cement-based wave-absorbing material (or called a nano-Fe 3 o 4 / Fly ash hollow microsphere composite is a cement-based wave-absorbing material with functional components, the same below), consisting of an absorbing layer and a matching layer, the matching layer is poured on the absorbing layer, the thickness of the absorbing layer is 20mm, and the matching layer The thickness is 10 mm; the preparation of the absorbing layer and the matching layer is as follows.

[0041] Utilize the preparation method of the composite cement-based wave-absorbing material of ferroferric oxide and fly ash hollow microspheres, it comprises the steps:

[0042] 1) Screening of fly ash micro-beads: the fly ash micro-beads are screened out by water separation method for floating beads and sinking beads, and the floating beads are selected as the carrier of the load to obtain fly ash floating beads for subsequent use;

[0043] 2) Pretreatment of fly ash microbeads: put fly ash floating bea...

Embodiment 2

[0058] The cement-based wave-absorbing material composited with ferroferric oxide and fly ash hollow microspheres is composed of an absorbing layer and a matching layer. The matching layer is cast on the absorbing layer. The thickness of the absorbing layer is 20mm, and the thickness of the matching layer is 10mm; The preparation of the absorbing layer and the matching layer is as follows.

[0059] Utilize the preparation method of the composite cement-based wave-absorbing material of ferroferric oxide and fly ash hollow microspheres, it comprises the steps:

[0060] 1) Screening of fly ash micro-beads: the fly ash micro-beads are screened out by water separation method for floating beads and sinking beads, and the floating beads are selected as the carrier of the load to obtain fly ash floating beads for subsequent use;

[0061] 2) Pretreatment of fly ash microbeads: put fly ash floating beads into 0.5mol / L NaOH solution, stir continuously at 60°C for 2 hours, filter and dry ...

Embodiment 3

[0075] The cement-based wave-absorbing material composited with ferroferric oxide and fly ash hollow microspheres is composed of an absorbing layer and a matching layer. The matching layer is cast on the absorbing layer. The thickness of the absorbing layer is 20mm, and the thickness of the matching layer is 10mm; The preparation of the absorbing layer and the matching layer is as follows.

[0076] Utilize the preparation method of the composite cement-based wave-absorbing material of ferroferric oxide and fly ash hollow microspheres, it comprises the steps:

[0077] 1) Screening of fly ash micro-beads: the fly ash micro-beads are screened out by water separation method for floating beads and sinking beads, and the floating beads are selected as the carrier of the load to obtain fly ash floating beads for subsequent use;

[0078] 2) Pretreatment of fly ash microbeads: put fly ash floating beads into 0.5mol / L NaOH solution, stir continuously at 60°C for 2 hours, filter and dry ...

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Abstract

The invention belongs to the field of building materials and particularly relates to a cement-based wave-absorbing material prepared by compounding ferroferric oxide and fly-ash hollow microspheres and a preparation method thereof. The cement-based wave-absorbing material prepared by compounding ferroferric oxide and fly-ash hollow microspheres is characterized by consisting of an absorbing layer and a matching layer, wherein the matching layer is cast on the absorbing layer, the thickness of the absorbing layer is 20-30 mm, and the thickness of the matching layer is 10-15 mm. 370 kg / <3> of cement, 13 kg / <3> of expanded perlite, 1110 kg / <3> of quartz sand, 148 kg / <3> of water and 11.1-25.9 kg / <3> of wave-absorbing agent are mixed, the surface of a sample is struck off to form the absorbing layer; according to the ratio of the expanded perlite to the cement to water of 91 kg / <3> to 944 kg / <3> to 378 kg / <3>, mixing is performed and the mixture is cast on the absorbing layer during initial setting of the absorbing layer to obtain the matching layer. The volume weight of the cement-based wave-absorbing material can be remarkably reduced, and the wave-absorbing property of the cement-based material is remarkably improved, so that the cement-based material has the advantages of having wide electromagnetic wave absorbing frequency band.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a cement-based wave-absorbing material using nanometer ferric oxide and fly ash hollow microsphere complex as functional components and a preparation method thereof. Background technique [0002] With the development of modern communication technology and the large-scale use of electronic and electrical products, the problem of electromagnetic radiation pollution is becoming more and more serious, and it is easy to cause problems such as information leakage and electronic signal interference. Therefore, it is of great significance to take measures to make buildings have the function of absorbing waves. [0003] Traditional microwave-absorbing functional cement-based materials are usually made of Fe 3 o 4 Powder, etc. are mixed into cement paste as a wave-absorbing component, but there are obvious technical problems: first, these Fe 3 o 4 The amount of powder adde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B41/68C09K3/00C04B24/16
CPCC04B28/04C04B40/0039C04B41/009C04B41/5079C04B41/68C04B2111/00258C09K3/00C04B14/308C04B20/008C04B18/082C04B24/16C04B14/185C04B14/06C04B22/002C04B24/24C04B41/4535
Inventor 何永佳崔亚青吕林女王发洲胡曙光
Owner WUHAN UNIV OF TECH
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