Which type of prefabricated concrete incorporates aluminum powder into its composition?

The choice of Autoclaved Aerated Concrete (AAC) as the correct answer is rooted in its unique composition and production process. AAC is a type of precast concrete that incorporates aluminum powder into the mixture during the manufacturing process. The aluminum powder reacts with the calcium hydroxide in the mix and produces hydrogen gas, resulting in a lightweight and porous material. This reaction contributes to the formation of small air pockets within the concrete, enhancing its thermal insulation properties and reducing its overall density.

AAC is particularly valued in construction for its lightweight nature, ease of handling, and excellent thermal insulation, making it an efficient choice for building applications. The inclusion of aluminum powder is critical to AAC's composition, distinguishing it from other types of concrete that do not utilize this method of creating a lightweight material.