A fireproof insulating foamed cementitious composition with
thermal energy storage capacity is provided for use in producing wall insulation boards, fireproof claddings for
steel structures, inner cores of fire resistant wall or door panels, and the like. The composition demonstrates improved energy efficiency in which
phase change materials, such as microencapsulates, are used in conjunction with a cementitious mixture of calcined
gypsum and hydraulic
cement, lightweight aggregates, a
polymer latex, and a foaming solution to create stable air bubbles inside the
cementitious matrix. The calcined
gypsum and the hydraulic
cement are present in a weight ratio range from about 1:3 to about 3:1. The composition may further include reinforced fibers, surfactants, inorganic
flame retardants, and other additives. The presence of the
phase change material not only increases energy efficiency of the cured cementitious foam material, but also improves compatibility between calcined
gypsum and
cement during
slurry mixing and hardening.