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What is AAC? What are the properties of AAC? How AAC blocks are produced?

 Definition of AAC Blocks

 AAC Blocks

 A - Autoclaved

A - Aerated

C - Concrete

 Autoclaved aerated concrete is a lightweight concrete containing uniformly distributed voids that is subjected to high-pressure steam curing.

 Production of AAC Blocks

  •  This is a light- weight building material produced by autoclaving a set mix of fine siliceous materials such as ground silica sand or flyash and the binders like Portland cement and lime.
  • Lightness is achieved by incorporating a large proportion of closed microscopic pores in the slurry with the help of entraining or foaming agent.
  • The basic raw materials are fine-ground sand or fly ash, cement, quicklime, anhydrite or gypsum, water, and aluminum powder or paste as a rising component.
  • A suitable mixture of these raw materials is poured into a mould, and the rising process starts due to the development of hydrogen gas formed by the reaction of aluminium in the alkaline suspension.
  • After 20 to 40 minutes the maximum rising height is achieved and after 2.5 – 4 hours for sand based recipes the cake shows a sufficient hardness for tilting and cutting.
  • In the case of fly ash based AAC the cake is ready for tilting and cutting after 1 – 2 hours.
  • During 6 to 10 hours steam curing at 12 -13 bar absolute tempera(190°C) further chemical reactions take place forming a high-quality lightweight building material.

 Advantages of autoclaved aerated concrete blocks

  •  High strength to weight ratio
  • Low thermal conductivity
  • Stability to variations in temperature and humidity
  • resistance to fire
  • low density blocks used in multey storey building units save foundation loads in the construction.

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