Reinforced autoclaved aerated concrete

Reinforced Autoclaved Aerated Concrete (RAAC) is a lightweight precast building material made from a mixture of fine aggregates, cement, water, and a small amount of aluminum powder. The aluminum powder acts as a foaming agent, causing a chemical reaction that produces hydrogen gas and creates air bubbles in the concrete mixture. This results in a concrete that is highly porous and has a lower density compared to conventional concrete, making it much lighter.