The combination of cement, lime, gypsum (anhydrite), finely ground sand and most importantly aluminium powder causes the mixture to expand considerably. Swede Axel Eriksson made a serious next step towards developing modern AAC, when in 1920, he patented the methods of making an aerated mix of limestone and ground slate so-called the “lime formula”. Americans Aylsworth and Dyer used aluminium powder and calcium hydroxide to attain porous cementitious mixture for which they also received a patent in 1914. Czech Hoffman successfully tested and patented the method of “aerating” the concrete by carbon dioxide in 1889. In 1880, a German researcher, Michaelis was granted a patent on his steam curing processes. The early history of AAC is based on a series of process patents. AAC stands for Autoclaved Aerated Concrete, alternatively known as Aerated Cellular Concrete (ACC) or Autoclaved Lightweight Concrete (ALC). Early History of AACĪAC as a building material has been industrially produced since the beginning of the 20th century. An overview of the latest AAC developments due to continued innovation will conclude with an outlook on the AAC industry landscape. Different AAC manufacturing technologies are hereby described and how competition contributed to ways of making AAC over the years. This review presents the background on AAC discovery, early commercial development and eventual international success. Throughout its existence, AAC has gained a considerable share in international construction markets and today maintains its reputation of the building material of the future. History of Autoclaved Aerated Concrete: The short story of a long-lasting building materialĪutoclaved Aerated Concrete (AAC) is a popular building material that draws its roots from the early 20th century.
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