Autoclaved Aerated Concrete, also known as AAC, is a green precast building material present in the global market for over 70 years and is extensively used in residential, commercial and industrial construction.AAC is a well-established building material, which has rapidly gained worldwide market share from conventional building materials because of its superior characteristics.This eco-friendly building material is made from natural raw materials such as sand (or fly-ash), cement, lime, gypsum, aluminium powder and water. This mix creates an aerated concrete providing insulation, structure and fire protection in one lightweight product.AAC is primarily composed of sand, cement, lime, and water. It undergoes a chemical reaction during which hydrogen gas is released, resulting in the formation of millions of tiny air cells within the material.