EPiC database - Autoclaved aerated concrete (AAC)

This material is part of the free Environmental Performance in Construction (EPiC) Database. The EPiC Database contains embodied environmental flow coefficients for 250+ construction materials using a comprehensive hybrid life cycle inventory approach.

Autoclaved Aerated Concrete, also known as AAC, is a lightweight concrete product manufactured from cement, water, aluminium powder and sand. Hydrogen gas is used to create air bubbles in the mix. AAC is generally rated at 8 MPa, with up to 80% of its volume made up of air.

Its lightweight nature, which is 20% lighter than standard concrete, makes it easier to work with. AAC materials can be sanded and cut to size using standard power tools and have superior thermal properties to standard concrete.

AAC comes in a variety of product types, including blocks and panels. AAC blocks are typically used for domestic wall construction and are available as a 600 mm wide and 200 mm high block in thicknesses ranging from 50 to 300 mm. Blocks can be used for loadbearing walls up to three storeys. Panels are often used for both wall and floor construction in residential and commercial applications. They are 600 mm wide, 75 mm thick and come in lengths ranging from 1800 to 4800 mm.