Autoclaved aerated concrete

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Autoclaved aerated concrete (AAC) is a lightweight, precast, cellular concrete building material, eco-friendly,^[1] suitable for producing concrete-like blocks. It is composed of quartz sand, calcined gypsum, lime, portland cement, water and aluminium powder.^[2][3] AAC products are cured under heat and pressure in an autoclave. Developed in the mid-1920s, AAC provides insulation, fire, and mold-resistance. Forms include blocks, wall panels, floor and roof panels, cladding (façade) panels and lintels.^[4][5] It is also an insulator.^[2][6]

AAC products see use in construction, such as industrial buildings, residential houses, apartment buildings, and townhouses. Their applications include exterior and interior walls, firewalls, wet room walls, diffusion-open thermal insulation boards, intermediate floors, upper floors, stairs, opening crossings, beams and pillars. Exterior uses require an applied finish to guard against weathering, such as a polymer-modified stucco or plaster compound, or a covering of siding materials such as natural or manufactured stone, veneer brick, metal or vinyl siding.^[2] AAC materials can be routed, sanded, or cut to size on-site using a hand saw and standard power tools with carbon steel cutters.^[2][7][8]