TY JOUR TI RAW CLAY MATERIALS FOR THE LIGHT-TONE CERAMIC BRICK FROM THE STANDPOINT OF VANADIUM SALT EFFLORESCENCE KW lining ceramic brick KW light-toned brick KW high-melting clay KW plasic shaping KW salt efflorescence KW vanadium salts JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Sysa, O.K. AU Moreva, I.Y. AU Trepalina, Y.N. AU Chepurnyh, A.A. AU Loktionov, V.A. AU Loktionova, E.V. PY 2020 IS 4 PB Belgorod State Technological University named after V.G. Shukhov