Evaluation of Physical Properties of Locally Available Materials Used for the Production of Radiation Shielding Concrete in Northern Nigeria.

This study evaluates the physical properties of locally sourced cement and aggregates for the production of radiation shielding concrete in Northern Nigeria. Tests conducted on Dangote Portland-limestone cement showed a specific gravity of 3.04, a 3 mm soundness, a fineness of 6%, initial and final setting times of 60 min and 164 min, and a normal consistency of 30%, all within ASTM and SON standards. Aggregate tests revealed bulk density values ranging from 1557.70 kg/m³ (granite) to 3006.42 kg/m³ (magnetite), and specific gravities ranging from 2.50 (river sand) to 4.79 (hematite). Gradation analysis showed that river sand and magnetite were well-graded, whereas coarse granite, coarse barite, and hematite failed to comply with ASTM C33 requirements, indicating poor grading. Moisture content and water absorption values varied between 0.5–1.01% and 1.17–2.02%, respectively. Overall, the tested materials exhibited favorable physical properties for use in radiation-shielding concrete.