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Aerated concrete (also called gas, foam or cellular concrete) made by the gas concrete route uses which chemical to liberate gas inside the fresh mortar?
Answer & Solution
Correct answer: B.
1. Gas concrete generates a cellular structure by a chemical reaction inside the fresh mix.
2. Finely divided aluminium powder reacts with calcium hydroxide liberated during cement hydration.
3. This evolves hydrogen gas, forming uniformly distributed bubbles in the matrix.
4. Large-scale producers cure the resulting blocks by high-pressure autoclaving.
5. Sodium bicarbonate, calcium chloride and zinc oxide are not used as gas-formers for aerated concrete.
_Source: IGNOU Concrete Technology, Unit 11 "Special Concrete" (Light Weight, Aerated, No-Fines, High Density, Fibre Reinforced, Polymer Concrete)._
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