AAC bricks is around 400-600mm X 200mm X 150–300mm

AAC mostly known as Autoclave Aerated
Concrete or Autoclaved Cellular Concrete is a agile, precast, foam solid
building material fabricated in the mid-1920s that concurrently provides framework,
insulation, and fire and mold intransigence. Blocks, wall-panels, floor and
roof boards, cladding or façade panels and lintels are all produce of AAC
bricks. The substance was perfected by Dr. Johan Axel Eriksson in the
Royal Institute of Technology and went into manufacturing in the Sweden in
1929. The raw materials in order to attain an AAC brick are quartz-sand, fly-ash,
air-entraining agents while lime, cement and water are used as a constraint
agent. The size of the bricks is around 400-600mm X 200mm X 150–300mm
with a variation of 1.5 mm (+/-). As per IS codes, it maintains a compressive
strength of 3-4 N/mm2 and dry density of up to 550-650 kg/m3 which encompasses
one third of the weight of clay brick which makes it easily portable.  It absorbs 10-12%
of water of its total volume and hence reflects a low thermal conductivity of
0.24 Kw-M/C and an 8″ inch wall of AAC can withstand a fire for up to 4
hours. For such bricks there is no top-soil consumption, so there is low
carbon-dioxide emission. Chemical mortars are utilized for adjoining the brick
which in-turn reduces the consumption of cement and also evades the process of
curing. These bricks possess good dimensional accuracy so there is less
requirement of thickness, in internal and external plaster. They commit to
government taxes in the form of central, excise and VAT. A single cum of these
bricks cost Rs. 4200 and being factory produce, they have high-end consistency
and quality, which leads to compensating concrete and steel quantities. However,
factory setup for the manufacturing of bricks is highly expensive hence, sometimes
there are issues with its availability. AAC is appropriate for urban regions
with tall structures and those with high temperature varieties and are
advisable for non-bearing and or RCC design in partition wall.