What is AAC Blocks ?
Autoclaved Aerated Concrete is a
Lightweight, Load-bearing, High-insulating, Durable building product, which is
produced in a wide range of sizes and strengths. AAC Blocks is
lightweight and compare to the red bricks AAC blocks are three times lighter.
Origins
The Autoclaved Aerated Concrete (AAC) material was developed in 1924 in
Sweden. It has become one of the most used building materials in Europe and is
rapidly growing in many other countries around the world.
AAC is produced from the common
materials lime, sand, cement and water, and a small amount of rising agent.
After mixing and moulding, it is then autoclaved under heat and pressure to
create its unique properties. AAC has excellent thermal insulation and acoustic
absorption properties. AAC is fire and pest resistant, and is economically and
environmentally superior to the more traditional structural building materials
such as concrete, wood, brick and stone.
At the point when AAC is blended
and cast in structures, a few compound responses occur that give AAC its light
weight (20% of the heaviness of cement) and warm properties. Aluminium powder
responds with calcium hydroxide and water to frame hydrogen. The hydrogen gas
froths and copies the volume of the crude blend making gas rises to 3mm (⅛
inch) in distance across. Toward the end of the frothing procedure, the
hydrogen escapes into the air and is supplanted via air.
AAC Blocks is a unique and
excellent type of building material due to its super heat, fire and sound
resistance, AAC blocks are lightweight and offers ultimate workability,
flexibility and durability. Its main ingredients include sand, water,
quicklime, cement and gypsum. The chemical reaction due to the aluminium paste
provides AAC its distinct porous structure, lightness, and insulation
properties, completely different compared to other lightweight concrete
materials.
When the forms are removed from
the material, it is solid but still soft. It is then cut into either blocks or
panels, and placed in an autoclave chamber for 12 hours. During this steam
pressure hardening process, when the temperature reaches 190° Celsius (374°
Fahrenheit) and the pressure reaches 8 to 12 bars, quartz sand reacts with
calcium hydroxide to form calcium silicate hydrate, which gives AAC its high
strength and other unique properties. Because of the relatively low temperature
used AAC blocks are not considered fired brick but a lightweight concrete
masonry unit. After the autoclaving process, the material is ready for immediate
use on the construction site. Depending on its density, up to 80% of the volume
of an AAC block is air. AAC's low density also accounts for its low structural
compression strength. It can carry loads of up to 8 MPa (1,160 PSI),
approximately 50% of the compressive strength of regular concrete.
AAC offers incredible
opportunities to increase building quality and at the same time reduce costs at
the construction site.
AAC is produced out of a mix of
quartz sand and/or pulverized fly ash (PFA), lime, cement, gypsum, water and aluminium
and is hardened by steam-curing in autoclaves. As a result of its excellent
properties, AAC is used in many building constructions, for example in
residential homes, commercial and industrial buildings, schools, hospitals,
hotels and many other applications. AAC contains 60% to 85% air by volume.
Advantages Of AAC Block
Fire
Resistant
Depending
upon the thickness of the Autoclaved Aerated Concrete (AAC) Blocks,
they offer fire resistance from 2 hours up to 6 hours. These blocks are highly
suitable for the areas where fire safety is of great priority.
Pest Resistant
Autoclaved
Aerated Concrete (AAC) Block consist of the inorganic material in its constitution
that helps preventing/avoiding termites, damages or losses.
Sound Proof
Earthquake Resistant
The light
weight property of the AAC blocks results into higher steadiness of the AAC
blocks in the structure of the buildings. As the impact of the earthquake is
directly proportional to the weight of the building, the building constructed
using AAC blocks are more reliable and safer.
Faster Construction
As the AAC
block is very easy to handle, manipulate and use ordinary tools for cutting the
wood such as the drill, band saws, etc. could be easily used to cut and align
the AAC. Moreover, the AAC blocks come with larger sizes and fewer joints. This
ultimately results in faster construction work as the installation time is
significantly reduced due to fewer amounts of blocks and the masonry amount
involved is also lowered resulting into reduced time-to-finish.
Long Lasting
AAC blocks
are highly superior in terms of the strength. Higher level of strength of these
blocks gives higher stability to the structure of the building. AAC is
manufactured from non-biodegradable materials, which neither rot nor attract
mould, keeping interiors clean and durable.
Cost Saving
AAC block
weighs almost around 80% less as compared to the conventional red brick
ultimately resulting into great reduction of deadweight. Further,the reduced
deadweight results into reduction of the use of cement and steel which helps
great in cost savings.
Versatile
AAC Blocks
have an attractive appearance and is readily adaptable to any style of
architecture. Almost any design can be achieved with AAC.
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