THE EFFECTS OF MIXING RATIO OF AGGREGATES ON ELECTROMAGNETIC WAVE ABSORPTION OF MORTAR MIXED WITH THE ELECTRIC ARC FURNACE OXIDIZING SLAG AND STYROFOAM BEADS AS AGGREGATES

<p>In order to prevent communication interference caused by electromagnetic wave interference, there is a need for an easy-to-create, inexpensive, flat-plate shaped wide band electromagnetic wave absorber suitable for mass use in buildings. Therefore, fabricates a wide band electromagnetic wave absorber by vibrating a mortar made of electric arc furnace oxidizing slag and styrofoam beads before it hardens. This wide band electromagnetic wave absorber can be manufactured cheaply and easily with general equipment.<br> The electromagnetic wave absorption of this mortar is determined by the change in complex relative permittivity and complex relative permeability from radio wave irradiation side to the opposite side. The complex relative permittivity and complex relative permeability of this mortar are affected by the distribution of aggregates in this mortar. The distribution of aggregate in this mortar is considered to be affected by the water-cement ratio, vibration time, density, particle size, mixing ratio of beads and slag, and the amount of admixture added.<br> In this study, it is clarified the effects of changing the mixing ratio of electric arc furnace oxidizing slag and styrofoam beads, on the flow value, aggregate distribution, and electromagnetic wave absorption.<br> From the above, within the range of measurement, increasing the ratio of styrofoam beads to total aggregates may make it possible to fabricate wide band electromagnetic wave absorbers with lower water-cement ratios because the aggregates flow more easily during vibration even if the flow value of the mortar is low, for example, mortar with a beads：slags ratio of 6：4 and water cement ratio of 50％ will be a wide band electromagnetic wave absorber, although it has a lower flow value than a mortar with a beads：slags ratio of 4：6 and water cement ratio of 55％, a single-layer narrow band electromagnetic wave absorber.</p>