TY JOUR TI ON THE ISSUE OF DEVELOPING DOMESTIC RESTORATION MATERIALS FOR ARCHITECTURAL MONUMENTS KW architectural monuments KW restoration KW import substitution KW polymer additives KW dry building mixes KW building mortars KW operational properties JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Onoprienko, N.N. AU Sal'nikova, O.N. PY 2023 IS 8 PB Belgorod State Technological University named after V.G. Shukhov