Research on absorbing properties of the concrete shielding material at 3mm wave bands

Abstract

The concrete was made :from standard sand, steel fiber, iron ore-sand, carbon-fiber felt, ZnO whisker, ferrite, acetylene gas black, carbonyl iron, so that the concrete shielding material has the microwave absorbing performance. It is to search for a new protection way of grand buildings and martial biding constructions. The concrete shielding material is first analyzed in 3mm wave bands. The paper focuses on the different absorption characteristic of concrete with different material and different content. The relation of content is discussed. It is guide for the future research

Double-Layered Cement Composites with Superior Electromagnetic Wave Absorbing Properties Containing Carbon Black and Expanded Polystyrene

“…Introducing certain electric conductive fillers is a simple and practical method to increase the cement's absorbing effectiveness [3,4]. There have been many studies on the reflection loss of cement-matrix composite materials, in which most of the fillers are metal powders [5,6], fibers [7][8][9][10][11] or ferrites [12][13][14][15][16][17]. With these fillers, cement-matrix composite materials can reach high reflection losses of -8~-20 dB in the frequency range tested.…”

Electromagnetic Wave Absorbing Properties of Glass Fiber Reinforced Cement Composites with Special-Shaped Structure Surfaces

“…Cement is slightly conductive and its absorbing ability is poor, but through introducing electromagnetic fillings or loadings, which can be transformed into functional materials with EMW-absorbing properties [3,4]. There have been many studies on the reflection loss of cement-matrix composite material, in which most of the fillers are large dielectric losses or magnetic losses absorbents, such as carbon [3,5], metal powders [6,7], magnetic ferrites [8][9][10] and their fibers [11][12][13][14]. With these fillers, cement composite materials can reach high reflection losses of -8~-20 dB in the frequency range tested.…”