TY JOUR TI USE OF A PENETRATING ADDITIVE TO INCREASE THE WATER RESISTANCE OF CONCRETE KW concrete KW fiber-reinforced concrete KW penetron KW fiber KW water resistance JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Abzalilova, A.V. AU Strokova, V.V. PY 2020 IS 5 PB Belgorod State Technological University named after V.G. Shukhov