RAAC

Autoclaved Aerated Concrete (AAC), also known as autoclaved cellular concrete or autoclaved concrete, is a lightweight, precast building material that is used as an alternative to traditional concrete blocks and clay bricks. It was developed in the mid-1920s by Johan Axel Eriksson. Unlike cellular concrete, which is typically mixed and poured on-site, AAC products are manufactured in a factory under controlled conditions.