TY JOUR TI The relationship of factors determining the durability of concrete KW durability of concrete KW water-cement ratio KW strength KW frost resistance KW density KW resistance to aggressive environments JO Proceedings of Petersburg Transport University AU Kazanskaya, L.F. AU Mayer, V.A. AU Sibgatullin, E.S. PY 2024 IS 21 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"