TY JOUR TI POSSIBILITY OF USING BLAST FURNACE SLAG IN CONCRETE AND MORTAR PRODUCTION IN VIETNAM KW granulated blast furnace slag KW cement KW industrial waste KW complex binder KW active mineral additive KW slag activity index JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Vu Kim, D.. AU Tang, V.L. AU Bazhenova, S.I. AU Nguyen Duyen, P.. PY 2019 IS 4 PB Belgorod State Technological University named after V.G. Shukhov