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The basic contribution of cellular concrete to the field of concrete technology is the ability to control the density of concrete over a wide range. Density control is achieved by adding a calculated amount of a proper foam to a slurry of water and cement, with or without the addition of sand or other aggregate. The wet density range for cellular concrete mixes is usually considered to be from about 320 to 1920 kg/m3 (20 to 120 lb/ft3).
Professor emeritus of civil engineering, University of Michigan, Ann Arbor, Mich.