What is Autoclaved Aerated Concrete?

What is Autoclaved Aerated Concrete?

autoclaved aerated concrete Autoclaved aerated concrete (AAC) building blocks is a lightweight, noncombustible siliceous material manufactured from a mixture of sand, fly ash, mine tailings, slag or other sources of silica, which is the largest of the dry raw materials in its composition; portland cement; quick lime; anhydrite; water; and an chemical aerating agent such as aluminum powder or paste.

The silica reacts with the aluminum to form a chemical reaction which creates the millions of tiny air cells which give AAC its unique properties. These raw materials are mixed together and cast into large steel molds where a chemical reaction takes place. The reaction between the chemical agent and other materials produces gas bubbles causing the slurry to rise and fill the mold. Hydrogen gas is generated in the wet slurry mixture, causing it to expand and form
millions of tiny air cells which give AAC block its unique properties.

Upon setting and before hardening, the AAC material is cut into precast block units for masonry wall construction. The precision blocks are steam-cured under pressure in an autoclave for about 12 hours, where the material is transformed into its finished state.

What is the history of AAC  Blocks?

AAC was invented in Sweden in 1923 as an alternative to their rapidly depleting timber supplies. It was the perfect building material, easily made from abundant natural resources, easy to work with, and would last forever. It is now one of the most common building materials with over 300 plants worldwide. It has only been available in the USA for less than 10 years. AAC is also known as autoclaved cellular concrete (ACC).

What are the construction benefits of AAC?

Autoclaved aerated concrete makes an excellent building material because of its outstanding thermal properties, superior fire resistance, and excellent acoustic absorbing abilities. Aerated concrete is also lightweight, easy to work with, versatile and is extremely durable.

AAC green building systems have been successfully utilized all over the world in different environments and climates in residential and commercial applications.  The short- and long-term benefits of Autoclaved aerated concrete construction systems are realized by homeowners owners, businesses, developers, architectural designers and building contractors alike. The benefits are achieved by the various material properties and methods developed and implemented by AAC home builders and home improvement contractors.

*Fast and efficient panel installation reduces labor cost
*Modular components provide for ease of erection
*AAC puts your project on the fast track
*No reshoring accelerates finish trades
*No furring, insulation or drywall needed
*Workable like wood

AAC blocks can be used to build almost every single part of your home. From the structural walls, floors, and roof to the trim, fireplace and countertops. You will realize time and labor savings on any project.


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