What is AAC

Autoclaved Aerated Concrete (AAC) is a solid yet lightweight building material widely used in construction throughout the world. The manufacturing process of AAC was developed in Scandinavia over 70 years ago. In the AAC manufacturing process, water and readily available dry ingredients – Silica, Lime, and Cement – are mixed with an expansion agent to form a semi-liquid mix called slurry, then poured into a mould. If panels are being produced, then steel mesh reinforcement will be appropriately placed in the mould before the slurry pour. Chemical reactions occur between the ingredients causing hydrogen to form, causing the slurry to rise. This is called the pre-curing stage. The hydrogen gas then dissipates, leaving tiny, finely dispersed air spaces. This is the essence of why AAC is much lighter than traditional concrete, yet strong and solid with excellent thermal properties. The solid but still soft mix is separated from the mould and cut to form the right-sized blocks or panels for the batch. All waste is recycled - the manufacturing process doesn’t stop there; however, the uncured AAC panels are ‘baked’ under high heat and steam. The blocks and panels are ready when they’re hardened or cured.