What Are the Uses, Benefits and Properties of Autoclaved Aerated Concrete (AAC) blocks?

Aerated concrete blocks are made with more than 80% air. They are also known as autoclaved aerated concrete (AAC) blocks. AAC blocks are lightweight and stronger than conventional concrete blocks. Lightweight concrete has been an arbitrary term up until now, but AAC has numerous advantages over conventional blocks.

Autoclaved Aerated Concrete (AAC) blocks
Autoclaved Aerated Concrete (AAC) blocks

How AAC Blocks are manufactured?

To make an aerated concrete block, the air is introduced into its composition by one of three processes.

  • One way to produce cellular concrete is to use porous aggregate, which retains air within the aggregate itself.
  • Another option is to use a single-size aggregate, thereby leaving interstitial air voids.
  • Finally, you can introduce air or other gas directly into the cement slurry in a manner that whenever the cement sets, it forms a uniform cellular concrete.

AAC, also known as aerated concrete, consists of cement paste with bubbles of air introduced into it. AAC is made from siliceous materials in the form of silica flour, ground burnt shale, and pulverized-fuel ash.

SEREMBAN, MALAYSIA -MARCH 16, 2020: Construction workers laying autoclaved aerated concrete block at the construction site. The use of this material can save time and facilitate construction work.

Properties of Autoclaved Aerated Concrete Blocks (AAC)


Aerated concrete blocks have a low density, which ranges between 25 to 50 pounds per cubic foot. The lighter grade of these blocks is used as insulation, but they have only moderate strength. A denser grade of AAC block also exists and has higher strength with lower insulation value. The density range for the heavier grade ranges from 40 to 50 pounds per cubic foot.


Compressive strength is difficult to assess because different testing methods, shapes, and samples can produce different values. Size and shape can affect the outcome of the test by 30 per cent.


Autoclaved aerated concrete blocks have a lower modulus of elasticity than regular concrete.

man contractor builder is holding an autoclaved aerated concrete block aac on a construction site.

Benefits of using Autoclaved Aerated Concrete Blocks

 You’re missing out on a great building material if you’re not using autoclave aerated concrete. AAC blocks have been around since 1920 and are still popular today because of their versatility, durability, and ease of use. Here’s why you should use them in your next project.

Quick Construction

AAC blocks are bigger than non-autoclaved aerated concrete blocks, and they have fewer joints. This means that AAC blocks are easier to manoeuvre, which leads to faster completion when working with these products.


These concrete blocks are strong and last longer than ordinary blocks. Their ingredients come from non-biodegradable sources and prevent mould growth.

Fire resistance

AAC blocks building materials may be your best option in safeguarding your property. It can take almost three hours for a fire to penetrate through them, but this depends on the size of the block.


 The cost-effectiveness of AAC blocks is one of their most attractive features. Compared to other types of blocks, the price per unit is not high. A significant amount of concrete and steel isn’t needed when using AAC blocks.

Energy efficient

Aerated blocks are good insulators and can help to keep a building at a pleasant temperature.

Bricklayer or mason lays bricks to construct wall of autoclaved aerated concrete blocks. Brickwork worker contractor doing precise masonry of foam concrete with spirit and laser levels.


If you need aerated blocks for your next construction project, then check out NXTBloc.in. We have a wide range of aerated blocks at the most competitive prices. AAC blocks are used in many building constructions, including residential and commercial buildings, hotels and hospitals. Our lightweight material provides the best thermal and sound insulation you need for your home today.

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