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In this study, clay composites were subjected to electromagnetic transmission testing at frequencies in the region of non-ionizing radiation. Specimens were made with partial substitution of clay with different admixtures by mass. Admixtures used were Fly Ash, four different particle sizes and phases of Titanium Dioxide (TiO2), Zinc Ferrite (ZnFe2O4), Maghemite (γ-Fe2O3) and Antimony Tin Oxide (ATO). The additives were thoroughly (chemically, structurally, morphologically) characterized. The replacement percentage was 5 wt.%. Electromagnetic transmission assessment included S21 transmission coefficient measurements for samples with different additives. The lowest transmission was reported for the clay specimens with ATO and Titanium Dioxide, especially at higher frequencies. A decrease in the transmission parameter with increasing specimen thickness was also confirmed.

In this study, electromagnetic (EM) radiation shielding of a clay composite with three different admixtures was tested. Because of the rapid development of new modern technologies, human exposure to non-ionizing EM radiation has grown exponentially. This has aroused the interest of scientists to answer the question of how long-term exposure to EM radiation is harmful to human health. Due to potential risks to human health and an increasing number of studies that have concluded that long-term EM radiation can be harmful to health, the WHO has classified the radiofrequency band (from 300 kHz to 300 GHz) as a potential cause of cancerous diseases. The frequency span 1.5-6 GHz was tested. Admixtures used as a partial replacement in mass percentage are fly ash, titanium dioxide and zinc ferrite. The percentage replacement was 5%. The results showed the lowest transmission in specimens with titanium dioxide addition. The lowest transmission in regards to the reference sample was about −10 dB. This research was done with the aim of production of load-bearing bricks with high protection against EM radiation for the construction of healthy buildings.

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