TY JOUR TI THE EFFECT OF POLYDISPERSE CONCRETE SCRAP OF 3D PRINTING ON THE STRUCTURE FORMATION OF CONCRETE KW concrete scrap KW structure KW granulometry KW filler KW fine-grained concrete JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Tolypina, N.M. AU Tolypin, D.. PY 2021 IS 6 PB Belgorod State Technological University named after V.G. Shukhov