TY JOUR TI REDUCTION OF FIRE RISK OF BUILDING STRUCTURES BASED ON THE USE OF FLAME RETARDANTS WITH A NEW COMPOSITION OF INTUMESCENT MINERALS KW flame retardant treatment KW intumescent minerals KW fire KW dry mortar JO Problems of risk management in the technosphere AU Akterskiy, Y.E. AU Tikhonov, Y.M. AU Dzhafarov, E.A. PY 2018 IS 2018 PB Saint-Petersburg University of State Fire Service of Emercom of Russia