Abstract: AAC stands for Autoclaved Aerated Concrete. It is an ultra-light concrete masonry product having good number of advantages in practicality. It is now gaining its importance in construction industry replacing all the conventional methods. This cellular structure gives AAC a number of exceptional physical characteristics. It weighs as little as 1/5 as much as ordinary concrete because of its distinct cellular structure which posses millions of tiny pockets of entrapped air. AAC consists of basic materials that are widely available. These include sand, cement, lime, gypsum, aluminium paste, water and an expansion.

Keywords: Autoclaved Aerated Concrete, Gypsum, Mineral admixture, Lightweight Concrete.