What is autoclaved aerated concrete

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Aerated concrete is a type of ready-mixed concrete that consists of all natural raw materials and offers great advantages and better energy efficiency. As early as 1914, the Swedes discovered a mixture of cement, lime, water and sand, similar to normal concrete, but with aluminum powder. This last material provides the expansion properties of Autoclaved Aerated Precast Concrete.

Aerated concrete: how is it made?

Aerated concrete is a lightweight precast concrete that contains air bubbles throughout the material to create the lightweight, low density material in an autoclave furnace.

It's so handy that it can be cut with a saw blade and drilled easily. Due to its properties, the concrete must be tested for compressive strength, moisture content, bulk tightness test and shrinkage test being checked. The concrete can be used on walls, floors, roof tiles, blocks and lintels.

Properties of aerated concrete

Aerated concrete blocks are solid, lightweight concrete blocks that are bonded with an adhesive and reinforced with steel for extra strength. AAC has incredibly high insulation values ​​and offers excellent sound insulation and is therefore used in high-quality constructions. The pre-cast aerated concrete wall systems are large-format massive rectangular prisms that are to be laid with thin-bed mortar. Installed units

must be protected from direct exposure to Moisture can be protected with a coating material.

Advantages and uses of aerated concrete

Some of the benefits you can get from using aerated concrete are:


  • heat protection , about 1. 25 per inch. The thermal conductivity of AAC is 6 to 7.5% compared to conventional concrete and is therefore energy efficient. AAC has lower energy costs

  • because it has greater thermal resistance. Excellent soundproofing material and soundproofing.

  • Aerated concrete offers fire and termite resistance.

  • AAC is made in various shapes and sizes.

  • AAC blocks store and release energy over time.

  • The aerated concrete is recyclable

  • . Route chases can be cut to install electrical and field installations.

  • Extremely light precast concrete parts

  • stacked like conventional CMU . Shipping and handling more economical than normal concrete or CMU.

  • The panels are available in thicknesses from 8 inches to 12 inches, 24 inches in width, and lengths up to 20 feet.

  • Blocks come 24 ", 32", and 48 "inches long, between four and 16 inches thick, and eight inches high.

  • Autoclaved aerated concrete disadvantages

Aerated concrete, like any other material, also has some disadvantages:

Consistency in quality and color can be difficult to achieve.

  • Unfinished exterior walls should be covered with exterior cladding to protect them from wear and tear.

  • When installing in environments with high humidity, interior fittings are included

  • low vapor permeability recommended, and high permeability exterior linings are recommended. Aerated concrete material costs

Autoclaved aerated concrete walls installed as a CMU can cost around $ 3. 50 in 8 "x 8" x 24 "depending on the complexity of the project. Labor costs may be lower because they are easier to install and operate.

These costs can vary from zone to zone depending on labor costs and building codes.

Building regulations acceptance of aerated concrete

Aerated concrete has been accepted by many building codes and international standards, such as:

ASTM C1386 (Prefabricated Aerated Concrete Wall Construction Units)

  • ASTM C 1452 (standard specification) for reinforced autoclaved aerated concrete elements

  • ACI 523.5R, Guide to the use of aerated concrete panels

  • Installation of aerated concrete

Aerated concrete can be easily installed with thin mortar and can easily be completed by paint, plaster, facing or facing materials. Autoclaved aerated concrete can rock or just be exposed on interior surfaces by plastering, tiling, painting, sheet metal.

Concrete comparison


Aerated concrete Traditional concrete Density (PCF)
25-50 80-150 Compressive strength (PSI)
360 - 1090 1000 - 10000 Fire protection (hours)
≤ 8 ≤ 6 Thermal conductivity (Btuin / ft2-hr-F)
0. 75 - 1. 20 6. 0 - 10