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AAC Blocks

What is AAC?

The Autoclaved Aerated Concrete (AAC) material was developed in 1920 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.

Autoclaved Aerated Concrete is a lightweight, load-bearing, high-insulating, durable building product, which is produced in a wide range of sizes.

AAC offers incredible opportunities to increase building quality and at the same time reduces costs at the construction site. AAC is produced out of a mix of pulverized fly ash (PFA), lime, cement, gypsum, water, aeration compound 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.

Advantages of AAC Blocks

Lightweight

AAC density is less than one-third of that of normal concrete blocks, making it easily handled.

Sound Resistant

AAC blocks can provide very good sound insulation / sound absorption with an STC rating of 44.

Thermal Comfort

AAC is excellent thermal insulation properties result in improved comfort level and saves heating and cooling costs.

Fire Resistant

More superior than traditional masonry for products with fire resistant up to 4 hours for a nominal block thickness of 100 mm.

Eco-friendly

AAC to help reduce at least 30% of environmental waste, decrease 50% of greenhouse radiation

Cost-effective

Speed and ease of installation result in cost savings compared to traditional masonry construction

Impact Resistant

Wall erected using 100 mm thick are to withstand impact loads potentially resulting from rough usage.

Durable

Histories of usage dated more than 50 years protecting building and remain durable even under extreme weather conditions.

Dimensional Accuracy

Blocks using modern machineries resulting in products with tighter dimensional tolerances.

Good Workability

AAC can be easily sawn, cut, nailed or drilled using ordinary hand tools

Dimension of AAC Blocks

Density of various Materials

Facts of AAC Blocks

Save up to 25% of Foundation Cost

Great savings in foundation and structural costs due to decrease in overall dead load.

Due to light weight and low density, overall dead load reduces, thus saving structural steel consumption compared to conventional masonry.

Wall Installation Speed

AAC Block vs Brick (m²/ workers/ day)

AAC blocks are seven times the size of traditional bricks. These results in substantial savings in Cement due to fewer joints compared to brick work and finished plaster work.

Faster construction gives higher work productivity.

Thermal Control

Heat insulation 6 times superior than clay brick.

Due to the numerous micropores in AAC, it has a very low thermal conductivity and makes an excellent thermal insulation material.

It keeps interiors cooler in summer and warmer in winters.

Property	Units	AAC Block	Clay Brick
Size	mm	600 X 200 X (100 to 300)	230 X 75 X110
Compressive Strength	N/mm₂	Min 3 *	2.5 to 3
Normal Dry (Oven Dry) Density	Kg/m₃	551 to 650 *	1800 to 2200
Thermal Conductivity "K"	W/m-k	Max 0.24 *	0.81
Drying Shrinkage	%	Max 0.05% *	-
Fire Resistance	Hrs.	2 to 6(Depending on thickness)	2
Sound Reduction Index	Db	45 for 200 mm thick wall	-
* As per IS 2185 Part 3

Comparison between AAC Block and Clay Brick

Parameter	AAC Block	Clay Brick
Structural Cost	Steel saving upto 15%	No saving
Cement Mortar for Plaster & Masonry	Required Less due to flat, even surface and less number of joints	Requires more due to lrregular surface and more number of joints.
Breakage	Less than 4%	Average 10 to 12%
Construction Speed	Speedy construction due to its big size, light weight and easy to cut in any size or shape.	Comparatively slow
Quality	Uniform & Consistent	Normally varies
Fitting & Chasing	All kind of fitting and chasing possible	All kind of fitting and chasing possible
Carpet Area	More due to less thickness of walling material	Comparatively Less
Energy Saving	Approx. 30% reduction in air-conditioned Load	No such saving
Chemical Composition	Flyash used around: 65 to 68% which reacts with lime and cement to form AAC	Soil used contains many inorganic impurities like sulphate etc. resulting in efflorescence