Autoclaved aerated concrete (AAC), also known as autoclaved
cellular concrete (ACC) or autoclaved lightweight concrete (ALC),
 was invented in the MID-1920s by the Swedish architect and
inventor Johan Axel Eriksson. It is a lightweight, precast
building material that simultaneously provides structure,
insulation, and fire and mold resistance. AAC products include
blocks, wall panels, floor and roof panels, and lintels.
It has been refined into a highly thermally insulating
concrete-based material used for both internal and external
construction. Besides AAC's insulating capability, one of its
advantages in construction is its quick and easy installation, for
the material can be routed, sanded, and cut to size on site using
standard carbon steel bandsaws, hand saws, and drills.
Even though regular cement mortar can be used, 98% of the buildings
erected with AAC materials use thin bed mortar, which comes to
deployment in a thickness of inch. This varies according to
national building codes and creates solid and compact building
members. AAC material can be coated with a stucco compound or
plaster against the elements. Siding materials such as brick or
vinyl siding can also be used to cover the outside of AAC
AAC has been produced for more than 70 years, and it offers
advantages over other cementitious construction materials, one of
the most important being its lower environmental impact.
AAC's improved thermal efficiency reduces the heating and cooling
load in buildings.
AAC's workability allows accurate cutting, which minimizes the
generation of solid waste during use.
AAC's resource efficiency gives it lower environmental impact in
all phases of its life cycle, from processing of raw materials to
the disposal of AAC waste.
AAC's light weight also saves cost & energy in transportation.
AAC's light weight saves labor.