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Light weight concrete is classified by the unit into three broad categories. Which set correctly names all three?
Answer & Solution
Correct answer: B.
1. The unit groups light weight concretes by how the air void is introduced.
2. The first category uses a porous low specific gravity light weight aggregate.
3. The second category traps air within the matrix to give aerated, cellular or foamed concrete.
4. The third category omits the fine fraction, producing no-fines concrete.
5. Ferro-cement, hot-mix and shrinkage-compensating concretes belong to other families.
_Source: IGNOU Concrete Technology, Unit 11 "Special Concrete" (Light Weight, Aerated, No-Fines, High Density, Fibre Reinforced, Polymer Concrete)._
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