TY JOUR TI MECHANICAL AND MICROSTRUCTURAL BEHAVIOR OF CONCRETE WITH LDPE WASTE AS PARTIAL FINE AGGREGATE REPLACEMENT KW mechanical properties of concrete KW polyethylene (LDPE) additives KW partial replacement for fine aggregate KW microstructural behavior of concrete KW plastic waste JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Obeid, M.A. AU Abu-Mahadi, M.I. AU Nasrat, N.G. PY 2026 IS 11 PB Belgorod State Technological University named after V.G. Shukhov