Gasbeton

Gasbeton, also known as autoclaved aerated concrete (AAC) or cellular concrete, is a lightweight precast building material characterized by a network of air voids throughout its matrix. It is produced by mixing cementitious binders (primarily Portland cement with lime), silica sand or fly ash, water, and a foaming agent such as aluminum powder. The foaming agent generates hydrogen gas, creating fine air voids and causing the mixture to expand before being cast into blocks or panels. These units are then cured in a steam autoclave at high temperature and pressure, which increases strength and dimensional stability.

Gasbeton has a low density (roughly 400–700 kg/m3), modest compressive strength (often 2–8 MPa, depending on density and grade), and excellent thermal insulation (thermal conductivity typically around 0.11–0.20 W/m·K). It is noncombustible and provides good fire resistance and acoustic insulation. It is easy to cut, drill, and shape with common tools, facilitating rapid construction. Its moisture handling is favorable when properly clad, as it is relatively vapor-permeable.

Uses and installation: Gasbeton is widely employed for walls and partitions in residential and commercial buildings. It can be used for exterior load-bearing walls in some designs and for structural elements such as lintels, floors, and roof components, depending on the grade.

Standards and environment: Production and products conform to European standards for autoclaved aerated concrete masonry units (for example EN 771-4) and related national codes. While autoclaving consumes energy, the material’s insulation properties can reduce overall energy use; recycling and disposal follow standard construction practices for cementitious products.