Radiation shielding materials are crucial for nuclear, industrial, and medical situations where shielding against ionizing radiation is a concern. In this study, the effect of ferric oxide (Fe2O3) incorporation on the mineralogical, physical, mechanical, and gamma-ray shielding properties of Portland cement-based concretes is studied. Concrete samples were made by replacing fine aggregate with Fe2O3 (0–40 wt%) in various amounts and were examined for mineralogy using XRD, elemental composition using XRF, density, porosity, and water absorption, compressive strength, elastic modulus, and compression through gamma-ray attenuation. The results showed that on average Fe2O3 incorporation led to higher concrete density (2.51–2.69 g/cm3), lower porosity of concrete, and a more than 38 % and 36 % reduction in water absorption, and improved gamma-shielding performance, with average increases in linear attenuation coefficient (LAC) of ∼7 % at energies of 0.511 and 0.662 MeV. Nevertheless, average compressive strength declined from 9.75 MPa (control) to 3.75 MPa (40 wt% Fe2O3) and the elastic modulus from 15.6 GPa to 9.7 GPa which are not strong load bearing results. Regression analysis produced predictive models (R2 > 0.95) relating Fe2O3 amount to density, porosity, and strength to allow for performance estimation for design. These results confirmed that Fe2O3 concretes, while not viable for structural load bearing, would still serve as effective non-structural shielding materials for medical and nuclear applications. Based on the data obtained from the Fe2O3 study, the upper limit of enhancement through Fe2O3 was assigned to CON30 to CON40, though these levels represent some of the highest attenuation values detected in relation to mechanical degradation. Therefore, the Fe2O3 doping group concretes do not uphold their suitability for load bearing applications but do give considerable merit for use as non-load bearing radiation shielding materials across medical, research, and nuclear facilities.
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