TY JOUR TI MODIFICATION OF NEUTRALIZED FLUOROGYPSUM USING HEAT TREATMENT AND A GYPSUM CONVERTER ADDITIVE KW fluorgypsum KW gypsum KW thermal treatment KW specific reactivity KW physico-mechanical properties KW specific reactivity KW strength JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Nazirov, R.A. AU Zhzhonykh, A.M. AU Novikov, N.S. AU Vede, P.Y. AU Aliev, S.A. PY 2025 IS 10 PB Belgorod State Technological University named after V.G. Shukhov