Foamed concrete can be produced by a pre-foaming method or
mixed foaming method [107]. Mortar or cement paste foamed
concrete (air-entraining concrete) is categorized as lightweight
concrete due to the existence of larger amounts of homogeneous
air-voids inside the matrix through a suitable foaming agent. This
method causes high flowability, lower unit weight, minimal consumption
of aggregate and excellent thermal conductivity [108].
The factors such as foam agent specification, foam preparation
method, material characteristics, mix design method, foam concrete
production and its performance in fresh and hardened state
are significantly important for the design of foamed concrete
[108]. Increasing the early strength of foamed concrete along with
a reduction on setting time is obtained by using calcium sulfoaluminate
cement [109], high alumina cement [109], and rapid hardening
Portland cement [110].