TY JOUR TI IBER CONCRETE FOR 3D-PRINTING KW additive technology KW construction KW 3D-printing KW construction technology KW structures KW buildings KW structural optimization JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Shorstova, E.S. AU Klyuev, S.V. AU Klyuev, A.V. PY 2019 IS 4 PB Belgorod State Technological University named after V.G. Shukhov