AAC (Autoclaved Aerated Concrete) blocks are lightweight, precast, foam concrete building blocks made from a mixture of sand, cement, lime, gypsum, water, and an expansion agent. The expansion agent used is typically aluminum powder, which reacts with the lime and water to form hydrogen gas, causing the mixture to expand and rise like bread dough. After the initial expansion, the mixture is poured into molds and then cured in an autoclave, which is a high-pressure chamber where the blocks undergo steam curing. The autoclaving process gives AAC blocks their unique properties. AAC blocks have several advantages over traditional concrete or clay bricks. Some of the key benefits include: AAC blocks are widely used in construction for various applications, including walls, floors, roofs, and partitions. They offer a durable, energy-efficient, and environmentally friendly alternative to traditional building materials.