TY JOUR TI THE INFLUENCE OF THE FOAMING AGENTS NATURE ON PHYSICAL AND TECHNICAL PROPERTIES OF FOAM KW foaming agent KW foam KW cellular concrete KW stability KW foam expansion KW density JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Popov, A.L. AU Nelyubova, V.V. AU Necvet, D.D. PY 2018 IS 3 PB Belgorod State Technological University named after V.G. Shukhov