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High density concrete is engineered for radiation shielding in nuclear installations. It requires the aggregate's specific gravity to be greater than approximately:
Answer & Solution
Correct answer: B.
1. Effective radiation shielding rises with the mass per unit area of the concrete cover.
2. The unit specifies high density aggregates as those whose specific gravity is more than 3.5.
3. Examples include barite, magnetite, ilmenite, limonite and hematite.
4. Steel and iron aggregates in the form of shots and punching scrap are also used.
5. A specific gravity of 2.6 is typical of normal-weight aggregate, not heavy weight.
_Source: IGNOU Concrete Technology, Unit 11 "Special Concrete" (Light Weight, Aerated, No-Fines, High Density, Fibre Reinforced, Polymer Concrete)._
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