TY JOUR TI INCREASE OF CRACK RESISTANCE OF FRC BY OPTIMIZATION OF GLASS-COMPOSITE MACROFIBER SHAPE KW fiber-reinforced concrete KW fiberglass composite fiber KW composite KW crack resistance KW fiber adhesion KW fiber KW fiber pullout JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Solovev, V.G. AU Sizyakov, I.D. AU Veselov, V.K. PY 2025 IS 10 PB Belgorod State Technological University named after V.G. Shukhov