Features of AAC Products

Features of AAC Products

Most notable features of AAC products are listed below:

Light Weight
One of the key features of AAC products is lower weight compared to clay bricks or concrete blocks (CMU). AAC products have a cellular structure created during manufacturing process. Millions of tiny air cells impart AAC products a very light weight structure. Density of these light weight AAC blocks usually ranges between 400 – 800 kg/m3. Yes, AAC blocks are lighter than water and literally float on water.

Ease of Use
AAC products are very easy to work with. AAC blocks can be cut or drilled using normal tools used with wood. Since AAC is cured using steam, it is ready to be used as soon as it comes out of autoclave.

AAC products can be used to make any design, be it carving or irregular shapes. Moreover it can be manufactured in various shapes and sizes to suit intended purpose.

Long Life
AAC does not rot or deteriorate over time. Structures built with AAC products have a long life and retain good finish even after decades. Although actual life of AAC products depends on various factors, as per various standards institutes, lifespan of AAC may go up to 100 years or more.

Ash disposal is a major concern for any thermal power plant using coal. Fly ash or pond ash generated by such power plants can be put to constructive use for AAC manufacturing. Moreover AAC manufacturing process requires less energy, has very low emission and does not generate any waste products.

Buildings constructed using AAC products have lower ’embodied energy’. Using AAC blocks and panels is highly recommended for any ‘Green Building’ project.

Building constructed using AAC products

Building constructed using Autoclaved Aerated Concrete (AAC) blocks

Thermal Insulation
Due to cellular structure, AAC products offer excellent thermal insulation. Usage of AAC products leads to energy savings for HVAC (Heating Ventilation And Cooling) needs. Use of AAC products offer walling, insulation and fire protection solution eliminating need for different materials for different needs.

Fire Resistance
AAC products offer amazing fire resistance. 8” wall made from AAC blocks can resist fire for up to five hours.

Sound Insulation
Tiny air pockets created during AAC manufacturing process stop sound from propagating from one end of the wall to another. Sound insulation of a wall built using AAC is much higher than a wall of similar thickness built using other materials. Some AAC companies even offer special AAC products produced specifically for sound insulation.

Pile of AAC products used at a construction site

Pile of Autoclaved Aerated Concrete (AAC) blocks at a construction site

Weather Resistance
AAC products do not decay, rust, deteriorate or burn. Building constructed using AAC products have better chance of surviving earthquakes due to reduced weight of entire building. It comes highly recommended for areas with high seismic activity. AAC structures are known to maintain structural integrity in heavy rains, extremely low temperature and salty air.

Pest Resistant
Primary raw material used to manufacture AAC blocks and panels is fly ash. Fly ash (or pond ash) is an inert material and does not allow termites or other pests to survive.

Over and above what is mentioned here, there are many other features of autoclaved aerated concrete products.

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  1. Hi there, we are trying to match an Indian style of building for a film production in Canada — what are the dimensions of the bricks in the buildings you have posted?

    • Dear Kacey,

      Thank you for your response on my website. Dimensions of blocks used in this building is 600 x 200 x 200. All measurements are in mm.


      Vishal Kansagra

  2. Hi Vishal,

    regarding the fire resistance capicity of seven hours, does it mean that after 7 hours the bricks catch fire.


    • Dear Nagesh,

      Thank you for your response on my website. After seven hours AAC blocks would not catch fire. Those blocks will start breaking.


      Vishal Kansagra

      • Hi Vishal,

        I might also add that this value also mean that after this amount of time, the heat from the fire source can be felt on the inside of the structure.
        Conventional building materials, at least CHB here in the Philippines, have at least 2-4 hours fire resistance.


  3. Recently i have been interacted by a enthusiastic entrepreneur, who has a Indianized AAC + CLC blocks making unit in the Central India , having put a unit of 100cum / day , but is running at 60 % capacity for captive use. such units can be put and stayed at various locations near thermal power plants.
    was making AAC blocks of dry density of 625 Kg /m3 , on some days , rest was making CLC blocks of 775 Kg /m3.