AAC: An Ideal Material for Resilient Buildings
Autoclaved aerated concrete, or AAC, was invented in Sweden in the early 1900s and patented in 1924. It is made by creating a slurry of finely ground quartz sand, calcined gypsum, lime and/or Portland cement, water, and a small amount of aluminum powder. The slurry is poured into rectangular tanks, filling them only partway.