"There is a confusion... between FC and similar materials in early literatures, i.e., aerated concrete and air-entrained concrete... However, one definition (i.e., FC is defined as a cementing material with the minimum of 20% foams by volume in the mixed plastic mortar) introduced by Van Dijk... clearly distinguish the FC from aerated concrete... and air-entrained concrete... The closed air-voids system in FC notably reduces its density and weight and at the same time produces efficient insulation and fire resistance capacity..."