AAC stands for autoclave aerated concrete. These are low-maintenance building materials with excellent thermal insulation and durability. A building with this block prevents heat from entering and keeps the building cool. These blocks are made from sand, lime, water, Portland cement, and aluminum powder. These are proliferating in the construction industry and are very easy to handle as they are very light in weight. This Aac is foam concrete and a sustainable construction material.These blocks are generally prefabricated building material that provides structural, fire, and fire resistance at the same time. It is made from silica-rich material such as sand, fly ash, etc., which is then combined with foaming material and lime. After this, the material is heated by ‘autoclave’ pressure.