TY JOUR TI THE QUESTION OF THE APPLICATION OF PRODUCTS OF VOLCANIC ACTIVITY IN THE MATERIAL SCIENCE KW products of volcanic activity KW tuff KW ash KW composite KW knit-ing KW mineral additives KW concrete KW energy JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Koval'chenko, O.. AU Alfimova, N.I. PY 2017 IS 2 PB Belgorod State Technological University named after V.G. Shukhov