Cellular cement composition applicable in the building field with the function of self-levelling screed, comprising a dry, or naturally wet, mixture constituted by at least a stone aggregate grinded mechanically with granules having maximum size of 25 mm, by at least a hydraulic binder, by possible polymeric inerts and comprising at least a water-reducing agent and mixing water, wherein said stone aggregate is constituted by sedimentary rock comprising the following component elements, which are present, with respect to the weight of the same stone aggregate, with values comprised in the following percentage in weight, for a maximum of 100%: calcarenite: 70,0 - 92,0 %, argillite: 3,5 - 8,0 %, calcite: 1,8 - 2,5 %, flint: 0,5 - 9,0 %, artificial conglomerate and opaque minerals: 0,9 - 1,5 %, furthermore, such a stone aggregate, with respect to the total volume thereof, having a portion comprised between 35 - 40 % in volume of granules with size smaller than 0,063 mm, said stone aggregate being in a quantity comprised between 325 and 1430 % in weight with respect to the weight of the hydraulic binder, said cellular cement composition comprising also in addition the following additives: - At least an aerating foaming agent, constituted for example by at least a surfactant, adapted to generate air bubbles, and being added in a quantity comprised between 0,1 and 4,0 % in weight with respect to the weight of the dry, or naturally wet, mixture; - At least a gel forming agent, constituted by a molecular colloid substance adapted to gel when it is put in contact with water, in such a way to block the ascent of the air bubbles obtained with the aerating foaming agent, and to retain inside itself the particles of said stone aggregate having size smaller than 0,063 mm, so at least the clay and the flint, and being added in quantity comprised between 0,03 and 0,10 % in weight with respect to the weight of the dry, or naturally wet, mixture, particularly in a quantity comprised between 0,03 and 0,05 % with temperatures lower than 15°C during the casting of the cellular cement composition, in a quantity comprised between 0,05 and 0,07 % with temperatures comprised between 15°C and 25°C during the casting of the cellular cement composition, in a quantity comprised between 0,07 and 0,1 % with temperatures greater than 25°C during the casting of the cellular cement composition. - At least an aerating foaming agent, constituted for example by at least a surfactant, adapted to generate air bubbles, and being added in a quantity comprised between 0,1 and 4,0 % in weight with respect to the weight of the dry, or naturally wet, mixture; - At least a gel forming agent, constituted by a molecular colloid substance adapted to gel when it is put in contact with water, in such a way to block the ascent of the air bubbles obtained with the aerating foaming agent, and to retain inside itself the particles of said stone aggregate having size smaller than 0,063 mm, so at least the clay and the flint, and being added in quantity comprised between 0,03 and 0,10 % in weight with respect to the weight of the dry, or naturally wet, mixture, particularly in a quantity comprised between 0,03 and 0,05 % with temperatures lower than 15°C during the casting of the cellular cement composition, in a quantity comprised between 0,05 and 0,07 % with temperatures comprised between 15°C and 25°C during the casting of the cellular cement composition, in a quantity comprised between 0,07 and 0,1 % with temperatures greater than 25°C during the casting of the cellular cement composition.