Merits And Demerits Of Autoclaved Aerated Concrete (AAC Blocks)

What is AAC blocks?

Autoclaved aerated concrete blocks (AAC)  was made in Sweden in 1924. It has become one of the most widely used construction materials in European countries and is growth all over the world. The AAC is produced by materials such as limestone, sand, cement, and water and a small amount of ascending agent.

Advantage of Autoclaved Aerated Concrete

1.  According to the verified source, Autoclaved Aerated Concrete blocks is very favourable because of

a)   High strength / weight ratio,

b)  Excellent tensile strength,

c)   Low coefficient of thermal expansion

d)  Its excellent thermal acoustic insulation properties due to the vacuum of air in the concrete.

2.  AAC block can reduce a dead load of construction materials, it will simultaneously reduce the reinforcement due to the lightness of the blocks.

3.  This block is produced by Fly ash it can avoid the inevitable waste - fly ash. By using fly ash, AAC blocks help to create a sustainable environment by reducing CO2 emissions, erosion of agricultural soils and water pollution.

4.  It is lighter than ordinary clay bricks so its simple to transport and economical.

5.  AAC’s lightweight saves on labour costs.

6.  AAC blocks are bigger in size than clay bricks, it means fewer joints in AAC wall construction.

7.  Production energy of AAC is low compared to the production of other construction products. Smaller air blanks and thermal mass of these blocks provide thermal insulation, thus reducing the cost of artificially maintaining a building's temperature.

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Disadvantage of Autoclaved Aerated Concrete

1.  AAC block work on monsoon season which can create cracks. It can be avoided by reducing motor strength it can be avoided and making sure the dry blocks used on installation

2.  Because AAC blocks are easily breakable, they should be treated carefully with bricks to avoid breaking

3.  The brittleness of the block requires long, thin screws when fitting cupboard, frames and wood-mounted drill bits or hammers.

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