AAC (Aerated Autoclaved Concrete) is a technology developed in the mid-1920s by the Swedes. The aerating is caused by a reaction of a mix of various materials mainly consisting of silica (through fly-ash), quicklime, cement and others. AAC blocks consist of around 80% air, this aerated material is processed through autoclaving which entails high pressurised curing of aerated materials formed in cellular shapes, which are known as AAC elements.
These elements can be further classified into blocks, wall/floor/roof panels and lintels. The AAC blocks are used as a substitute for the conventional building masonry and have been widely accepted globally because of their beneficial properties such as light weight, thermal and sound insulation, mould resistance and other benefits which ease the process of construction. Not only that, but these precast building elements are environment friendly as their processing hardly causes pollution and also boasts the consumption of fly ash which is waste material. AAC material is being used throughout industrial, commercial and residential structures for different applications such as external and internal walls, roofs, other partitions and divisions.
 

AAC BLOCKS COVERAGE

Size (mm)

Quantity of Blocks

Cubic Meters Required

L x H x W 100 Sq. Mtr. 100 Sq. Ft 1. CBM For 100 Sq. Mtr. For 100 Sq. Ft.
625x240x50 615.38 57.17 82.05 7.50 0.70
625x240x75 615.38 57.17 61.54 10.00 0.93
625x240x100 615.38 57.17 61.54 10.00 0.93
625x240x125 615.38 57.17 49.23 12.50 1.16
625x240x150 615.38 57.17 41.03 15.00 1.39
625x240x200 615.38 57.17 30.77 20.00 1.86
625x240x225 615.38 57.17 27.35 22.50 2.09
625x240x250 615.38 57.17 24.62 25.00 2.32
625x240x300 615.38 57.17 20.51 30.00 2.79
625x200x100 769.23 71.46 76.92 10.00 0.93
625x200x150 769.23 71.46 51.28 15.00 1.39
625x200x225 769.23 71.46 34.19 22.50 2.09
600x200x100 833.33 77.42 83.33 10.00 0.93
600x200x150 833.33 77.42 55.56 15.00 1.39
600x200x225 833.33 77.42 37.04 22.50 2.09

FEATURES AND BENEFITS

Energy Efficient :

Thermal insulation is one of the greatest benefits of using AAC blocks, as the AAC block wall helps maintain distinct internal and external temperatures, saving energy costs.

Water Saver :

For the curing process of AAC block walls, there is no need to water the blocks, only the mortar joints need to be cured with water, saving on water consumption.

Time Saving :

Time consumed in building walls decreases due to light weight of the product and its size over conventional clay bricks, decreasing lead time as well as installation time.

Minimum Storage :

Supplies are available in all seasons so that AAC block buyers do not need to maintain large storage areas for AAC blocks.

Earthquake Resistant :

The manufacturing process gives the blocks commendable strength, maintaining its light weight property due to which the steadiness of these blocks in buildings is more reliable, making it earthquake resistant.

Sound Insulation :

Having a commendable STC (Sound Transmission Class), AAC elements are appropriate material for wall instruction.

Fire Resistant :

AAC blocks are suitable for use in areas where fire safety is recommended, as these blocks are fire resistant for about 2 to 6 hours depending on the thickness of the wall.

Pest Resistant :

The pest resistant properties (as the blocks are made of inorganic materials) of AAC keeps termites away, avoiding damages and losses.

Minimum Wastage :

Breakage of AAC blocks is negligible, less than 5%, which increases the utilisation of the blocks.

Cost Saving :

  • AAC blocks are X9 the size of clay bricks, reducing the need for ortar joints by over 66%.
  • Lightweight properties lead to a lighter dead load on the building structure.
  • Due to surface accuracy of the blocks, the need for plaster on AAC blocks is less.
  • High insulation properties result in saving of energy costs.

TECHNICAL SPECIFICATIONS

Particulars Units Values# Requirement as per IS-2185 Part-3
Size (Length x Height) mm 650 x 250 / 650 x 200* NA
Size (Width) mm 75, 100, 125, 150, 200, 225, 250, 300 NA
Size Tolerance (Maximum) mm ± 1 L: ± 5 mm, H & W: ± 3 mm.
Compressive Strength N/mm2 > 3.5 > 3 ( density range 551-650 Gr-2 )
Oven Dry Density Kg/m3 560-640 551-650
Fire Resistance Hrs 4 ( for 200 mm thick wall ) Min 2 hrs is desirable.
Thermal Conductivity (K Value) W/mk 0.16-0.21 0.24 Max
Sound Reduction dB 37-42 NA
Modulus of Elasticity Mpa 2040 NA
Thermal Resistance (R Value) m2.K/W 0.95 (200 mm Width) @ K=0.21W/mK Max Value is desirable.
Thermal Conductance (U Value) W/m2K 1.05 (200 mm Width) @ K= 0.21W/mK Minimum Value is desirable
Drying Shrinkage (Maximum) % 0.04 0.1 for Gr-2 & 0.05 for Gr-1
Sound Transmission Class Rating dB 44 NA
Capillary Water Absorption gm/dm2 180 ≤210 @24 Hrs (as per NFP 14306)

COMPARISON

Particulars AAC Block Clay Brick
Size (LxHxB) mm 650 x 250 / 200 x 75 - 300 230 x 75 x 100
Precision in Size (mm) 3± (thickness) 5± (thickness)
Dry Density 550-650 kg/m3 (Oven dry) 1800 kg/m3
Sound Reduction Index (dB) 45 for 200 mm thick wall 50 for 230 mm thick wall
Thermal Conductivity (Kw-m/C) 0.16 0.81
Mortar Consumption M3 with 1:6 0.5 bag of Cement 1.35 bag of cement
Construction Time per Mason 30 sqm. 20 sqm.
Chemical Composition Fly ash used around 65% which
reacts with binders to form AAC
Soil is used which contains inorganic
Impurities resulting in Efflorescence
Finishing Can be directly cut or shaped /
sculptured as required
Not possible
Contribution to Carpet Area 3-5% No Contribution
Cost Benefit Factor Upto 24% in structural cost
(Subject to project design)
No Cost Benefit
Energy Saving Upto 30% of Airconditioning
Load reduction.
No Energy Saving
Capillary Water Absorption Less (due to low density) More (due to high density)

# The Values obtained are from our laboratory testing conditions. Tests conducted on site conditions may show slight variation due to methods of testing/application.
*Custom sizes also manufactured.

Stacking
Stack on dry and even surface to avoid damage and contact with moisture

Cutting Of Block
Use tool like hacksaw or rotary cutter

Mortar For Masonry
Thin-bed Mortar or cement: sand (1:6)


Wetting Of Block Before Application
Dip in water and lift immediately