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Noun: variable density concrete
  1. A type of aerated concrete with the addition of an air-entraining agent (or a lightweight aggregate such as expanded clay aggregate or cork granules and vermiculite).
    - cellular concrete, ultra-lightweight concrete, lightweight aerated concrete, lightweight concrete, foamed concrete

Type of: AAC, autoclaved aerated concrete, autoclaved cellular concrete, autoclaved concrete, autoclaved lightweight concrete, porous concrete