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

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...

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.