About AAC Blocks

AAC stands for Autoclaved Aerated Concrete.

AAC blocks are the new favourite building material of the construction industry

These blocks are lightweight, energy-efficient, fire-resistant and an excellent thermal insulator. The blocks are extremely lightweight and thus suitable for internal as well as external construction.

Aerated concrete blocks are ideal for all kind of structures such as schools, hospitals, hotels, offices, independent housing and apartments. The buildings constructed with AAC blocks are also known as environmentally friendly buildings and these buildings don't require curing and plastering.

AAC was developed in 1924 by a Swedish architect, who was looking for an alternate building material with properties similar to that of wood - good thermal insulation, solid structure and easy to work with.

Autoclaved Aerated Concrete blocks are manufactured by recycling fly-ash. Fly ash is mixed with cement, lime, water and an aerating agent.

Why use AAC blocks

  • Energy saving
  • Easy to install
  • Less weight
  • Endurance
  • Precision
  • Non toxic
  • Thermal insulation
  • Fire resistance
  • Acoustic performance
  • Moisture resistance
  • Workability
  • Cost saving
  • Fast construction
  • Water barrier
  • Fire resistance
  • Earthquake resistant
  • Reduce plaster cost
  • High strength
  • Pest resistant

AAC Block Advantages

Light Weight

It is four times lighter than traditional bricks.

Cost Effective

Reduces operating costs and overall construction costs.

Fire resistant

Non-combustible & can withstand 6 hours of direct heat exposure.

Sound Insulation

Excellent acoustic insulation.

Accuracy In Size

High dimensional accuracy, available in exact sizes. Requires no thick set mortar.

Faster Construction

Reduces construction time by 20%. Easy to install. Constructing with AAC is very rapid

Energy Saving

Low thermal conductivity of AAC blocks ensure better thermal energy efficiency.

Longer Life

Durable, high compressive strength & termite resistant. Requires no plastering or curing.

Low water absorpation

The water absorption of AAC blocks is relatively lower than others.

Earthquake Resistant

Light weight AAC blocks reduces the impact of an earthquake on a building.

Environmental friendly

Manufactured using recyclable industrial waste material named fly ash.

BIS Norms

Manufactured as per BIS Norms.

Highly Insulating

Excellent thermal insulation. Higher savings on heating and cooling costs.

High Workability

Blocks can be easily cut, drilled, nailed, milled & grooved. Excellent size/weight ratio.

AAC Blocks Comparison

Parameter MEPCRETE AAC Block Concrete Block Clay Brick
Size (mm) (600x200x100-300) (400x200x100-200) (230x115x75)
Variation in dimensions +/-1mm +/-3mm +/-5mm
Compressive strength 30 - 50 kg/cm2 40 - 50 kg/cm2 25 - 30 kg/cm2
Dry Density 550 - 700 kg/m3 1800 kg/m3 1950 Kg/m3
Fire Resistance 4 - 6 Hour’s
Depending on
4 hours 2 hour
Sound Reduction Index (dB) 60 for 200 mm thick wall 30 for 200 mm thick wall 40 for 230 mm thick wall
Thermal Conductivity
0.122 0.51 0.81

AAC blocks cost saving & benefits

Reduces overall construction cost by 30%"

  • AAC blocks are the best alternative to other building materials such as steel, cement and jelly.
  • High-insulation blocks save up to 30% in energy costs. Reduces construction time by 20%
  • Reduces operating cost by 30-40%
  • No burning of fossil fuel (Coal)
  • No emission of Carbon Di-Oxide (Co2)
  • Steam cured cement blended blocks
  • Superior thermal insulation of the blocks reduces the need to turn on the air conditioner which in turn helps in saving electricity costs.
  • Reduces overall construction cost by 30% as it requires less jointing and reduces need for cement and steel.
  • Helps in saving unnecessary labour costs
  • Reduces overall labour and material costs
  • The blocks maintain ecological stability
  • No top soil cutting which saves precious land

AAC manufacturing process

Autoclaved Aerated Concrete blocks are manufactured by recycling fly-ash, a waste generated from thermal power plant. Fly ash is mixed with cement, lime, water and an aerating agent.

When AAC is mixed and cast in forms, several chemical reactions take place that give AAC its light weight and thermal properties. Aluminium powder reacts with calcium hydroxide and water to form hydrogen. The hydrogen gas foams and doubles the volume of the raw mix creating gas bubbles up to 3mm in diameter. At the end of the foaming process, the hydrogen escapes into the atmosphere and is replaced by air.

This process requires 30% less energy compared to clay brick manufacturing.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. 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.