Nghiên cứu sử dụng quặng sắt và barite kết hợp với phụ gia khoáng trong chế tạo bê tông siêu nặng cho công trình bức xạ

Ultra-Heavyweight concrete (UHC) incorporating high-density fine aggregates plays a crucial role in radiation shielding structures at nuclear power plants and medical facilities that utilize X-ray equipment, linear accelerators, or other radioactive sources. The production of UHC requires the use of high-density aggregates in combination with techniques to enhance the compactness of the concrete matrix. This study investigates the potential application of ilmenite and barite ore powder, combined with Portland cement, and mineral–chemical admixtures, for the production of ultra-heavy fine-grained radiation shielding concrete. Experimental results indicate that the concrete mixtures exhibited good workability, a bulk density greater than 3300 kg/m³, and average compressive strengths ranging from 50 to 70 MPa at 28 days. These findings highlight the potential of utilizing locally available materials for producing high-density, high-strength radiation shielding concrete, which meets the technical requirements for radiation-resistant structures in irradiation facilities and nuclear reactors in Vietnam.