AAConcrete - Aerated Autoclaved Concrete 2009 Page 1...

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2009 Page 1 Aerated Autoclaved Concrete (AAC) Aerated autoclaved concrete (AAC) is not a new building system, but it is relatively new to North America. The product was developed over 70 years ago in Europe and is produced in over 250 factories in Europe, Asia, and Latin America. Literally thousands of residential and commercial buildings have been built with the product. The material is lightweight (about 80-85% air), cuts easily with ordinary carpentry tools, is an excellent insulator, and resists water. It actually floats! In 1999 there were 10 planned or existing factories producing aerated autoclaved concrete blocks and panels in the United States. In 2006, that number had been reduced to two: AERCON of Haines City, FL and SafeCrete, Inc., of Ringgold, GA. Another producer (Contec Mexicana) is located in Mexico. It is difficult to identify the cause of the failure of the product’s ability to capture a reasonable share of the market. Some say that the failure of AAC to capture a large share of the market has been inadequate marketing and support programs. Manufacturing AAC is manufactured by combining sand, lime, cement, and water plus an expansion agent that reacts with the other ingredients to form the porous microstructure in the concrete. A magnified view of this porosity is shown below. The manufacturing process for the block form of AAC begins by mixing carefully measured quantities of the ingredients. After mixing, the slurry is poured into molds and allowed to “rise” much like cake batter in an oven. 1
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This note was uploaded on 08/27/2011 for the course BCN 4023 taught by Professor Stroh during the Spring '11 term at University of Florida.

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AAConcrete - Aerated Autoclaved Concrete 2009 Page 1...

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