TY JOUR TI OBTAINING FILLED POLYURETHANE FOAM WITH IMPROVED OPERATIONAL PROPERTIES KW polyurethane foam KW filling KW physical and mechanical properties KW mining waste KW granulometric composition KW foaming ratio JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Kocherzhenko, A.V. PY 2019 IS 4 PB Belgorod State Technological University named after V.G. Shukhov