TY JOUR TI STUDY OF THE STRENGTH OF CONCRETE ON QUARTZ-GLAUCONITE SAND WITH A COMPLEX ADDITIVE KW quartz-glauconite sand KW fine-grained concrete KW microsilica KW superplasticizer KW hardening accelerator KW three-factor experimental design KW compressive and flexural strength JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Lukuttsova, N.P. AU Golovin, S.N. AU Pykin, A.A. AU Vorobyov, A.A. AU Khandozhko, E.S. PY 2025 IS 10 PB Belgorod State Technological University named after V.G. Shukhov