Concretes Containing Hematite for Use as Shielding Barriers
Keywords:hematite, heavyweight concrete, radiation shielding, concrete aggregate.
Heavyweight concrete is widely used for radiation shielding of nuclear reactors and other structures that require
radiation impermeability. Aggregates play here an important role – while hematite and other iron ores are commonly
used for the purpose. However, little information on properties of hematite-containing concrete other than radiation
shielding data has been reported. We have studied effects of different concentrations of hematite (10 to 50 volume % at
10 % intervals) on physical and mechanical properties of concrete. A unique water-to-cement ratio of 0.42 kg/m3 and
400 kg/m3 cement content was selected. Addition of hematite increases the unit weight (density) so that a smaller
thickness of concrete is required to provide radiation shielding. After 30 freeze-thaw cycles the plain concrete looses
21.3 % of its compressive strength while the composite containing 10 % hematite looses only 7.8 % of the strength.
Concrete and hematite composites have lower drying shrinkage than plain concrete, thus lowering stresses resulting from
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