Electromagnetic wave absorbing concrete and preparation method thereof

Abstract

The invention relates to electromagnetic wave absorbing concrete and a preparation method of the concrete and belongs to the field of building materials. The concrete is prepared from a polymethylacrylic composite wave absorbing material containing nano LiFe5O8 / graphene oxide, a nano beta-MnO2 / graphene oxide composite wave absorbing material, water, cement, slag powder, coal ash, a water reducer, a fine aggregate and macadams by the steps of mixing, stirring and pouring. The concrete provided by the invention shows a good broadband microwave absorbing performance in a range of 2-18GHz, and the bandwidth of the concrete lower than -7dB is optimally 13.7GHz and the bandwidth of the concrete lower than -10dB is optimally 9.8GHz, so that the concrete can be applied to electromagnetic wave protection of critical buildings of military and administrative branches, functional building internally provided with a lot of precise electronic instruments, buildings adjacent to radar, microwave base stations, high power wireless communication transmitting stations and the like. The concrete provided by the invention is innovative, high in scientific content and broad in application prospect.

Description

technical field

[0001] The invention relates to concrete with the function of absorbing electromagnetic waves and a preparation method of the concrete, belonging to the field of building materials. Background technique

[0002] Absorbing concrete is a functional concrete that can absorb electromagnetic waves within a certain frequency range through energy attenuation, conversion, and dissipation. At present, with the rapid development of electronics, electrical, communication and information industries, electromagnetic wave interference, electromagnetic wave information leakage and electromagnetic environmental pollution caused by electromagnetic wave radiation are becoming more and more serious, becoming the fourth largest global pollution after water pollution, air pollution and noise pollution. environmental issues. All kinds of buildings, especially the key buildings of military and administrative departments closely related to national security, functional buildings wi...