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Exfoliated vermiculite produces a very light insulating concrete because the parent mineral, when heated, expands several times its original volume to give a density of:
Answer & Solution
Correct answer: A.
1. Vermiculite is a micaceous mineral with a laminar structure.
2. On heating in the presence of moisture it exfoliates, expanding many times in volume.
3. The exfoliated material settles at a bulk density of 60–130 kg/m³.
4. The resulting concrete is very light and weak, used for sound and heat insulation.
5. Densities of hundreds of kg/m³ apply to coarser light weight aggregates, not exfoliated vermiculite.
_Source: IGNOU Concrete Technology, Unit 11 "Special Concrete" (Light Weight, Aerated, No-Fines, High Density, Fibre Reinforced, Polymer Concrete)._
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