Establishing a regular relationship between the properties of concrete and its composition, taking into account the manufacturing technology, is the most important problem of concrete science. For light concretes, the complexity of the task is exacerbated by the fact that the suction of water by a porous aggregate significantly affects both the properties of the concrete mixture and the process of hardening of concrete .. The assignment of an indicative reference composition for the subsequent manufacture of test kneaders is made in various ways using calculation formulas, tables, graphs. The final composition of concrete shall be determined on the basis of a pilot test . Methodical instructions prepared at the Department of Technology of Building Materials and Products of OSU