TY JOUR TI MODIFIED FIBERBOARD FOR MONOLITHIC BEAMS KW fibroconcrete KW carbon nanotubes KW device technology KW crossbar KW fiber JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Huzin, A.F. AU Bogdanov, R.R. AU Mavlyuberdinov, A.R. AU Suleymanova, L.A. PY 2026 IS 11 PB Belgorod State Technological University named after V.G. Shukhov