The Electromagnetic Wave Absorption Performance and Mechanical Properties of Cement-Based Composite Material Mixed with Functional Aggregates with High Fe2O3 and SiC

Abstract

Now there’re many researches on the electromagnetic radiation protection function of the cement-based electromagnetic wave absorbing materials, such materials have been widely used in various types of buildings. This paper proposed an idea for preparing a cement-based composite material by mixing functional aggregates with high content of Fe2O3 and SiC, that is, adding Fe3O4 powder and nano-SiC of different contents in the clay, and then sintering at 1190℃; the prepared aggregates showed obvious magnetic loss and dielectric loss to electromagnetic waves, and the numerical tube pressure could reach 16.83MPa. The double-layer reflectivity test board made of functional aggregates showed excellent electromagnetic wave absorption performance, its reflection loss was less than -10dB in the frequency range of 8~18GHz (corresponding to energy absorption greater than 90% EM), and its maximum RL reached -12.13dB. In addition, the compressive strength of the cement-based composite material at the age of 28 days reached 50.1 MPa, which can meet the strength requirements of building materials.

Nano-additives and their effects on the microwave absorptions and mechanical properties of the composite materials

“…To enhance the dielectric and magnetic absorbing materials, different nano modifiers, can be used. Carbon nanotube (CNTs, MWCNT) [12][13][14][15], carbon black [16,17], activated carbon derived from coconut-fiber [18], carbonyl-iron nano particles [19][20][21][22], iron oxide nanoparticle [23], (Fe‚ Co) oxide nanoparticles [24], Fe 2 O 3 and SiC particle [25], Ni-Zn ferrite [26], copper nanoparticles [27], NiO [28] are some of additives mostly applied for electromagnetic wave absorption. MWCNT [29,30], iron powder [31] are some particles used for mechanical and fracture behavior enhancement.…”