Correct option is C
Answer (Concrete Technology – Aerated Concrete)
Aerated concrete is a type of lightweight concrete in which air voids are intentionally introduced to reduce the density and improve thermal insulation properties. These air voids are produced by adding a gas forming agent into the cement matrix.
During the reaction, the gas forming agent reacts with the cement slurry and releases hydrogen gas, which forms uniform air bubbles throughout the concrete mass, resulting in a cellular or aerated structure after hardening.
The most commonly used gas forming agent for producing aerated concrete is powdered aluminum. When aluminum powder reacts with calcium hydroxide in cement, hydrogen gas is liberated, creating the required air voids.
Conclusion
Aerated concrete is produced by adding powdered aluminum in concrete.
Correct Option:
C) Powdered Aluminum
