Effect of hematite and iron slag as aggregate replacement on thermal, mechanical, and gamma-radiation shielding properties of concrete

Abstract

Improving concrete shielding properties for preserving both environmental and human safety in nuclear power plants is essential. Iron slag and Hematite have high molar mass such that they are used to enhance shielding properties of concrete. This study aims to investigate the optimum percentage of hematite or iron slag as an aggregate replacement on mechanical properties, gamma-ray shielding, and thermal properties of high-density concrete. For this purpose, concrete mixes were prepared with different percentages of hematite and iron slag; 0 to 30% as a partial replacement of crushed limestone aggregate. Also, two types of cement were considered; CEM II/B-Q 42.5N and CEM III/A 42.5N. Based on test results, the use of hematite and iron slag has been found to enhance the shielding properties of concrete subjected to 137Cs and 60Co point sources. Moreover, incorporating 30% hematite or iron slag led to significant enhancement in compressive strength, while the highest specific heat was obtained for 30% slag mixes.