TY JOUR TI INFLUENCE OF MINERAL FINE SAPONITE-CONTAINING ADDITIVE ON SURFACE ACTIVITY OF PLASTICIZER KW saponite-containing material KW plasticizer KW surface activity KW highly dispersed powder KW water-cement ratio JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Frolova, M.A. AU Lesovik, V.S. AU Drozdyuk, T.A. PY 2025 IS 10 PB Belgorod State Technological University named after V.G. Shukhov