What is AAC Light Weight Blocks?
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.
The AAC Light Weight Blocks are durable, energy saving and Light Weight construction material provides cost efficient and eco-friendly walling solutions. Strong and lightweight AAC Blocks are the excellent substitute for clay bricks, concrete and hollow blocks.
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.
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.
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.
Technical Specification
| 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 |