TY JOUR TI ROLE OF GRANULOMETRY OF MIXED BINDERS IN FORMATION OF THEIR MICROSTRUCTURE AND STRENGTH KW mixed binders KW volcanic ash KW particle size distribution KW microstructure KW cement stone strength JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Zagorodnyuk, L.H. AU Mahortov, D.S. AU Ryzhikh, V.D. AU Sumskoy, D.A. AU Dayronas, M.V. PY 2021 IS 6 PB Belgorod State Technological University named after V.G. Shukhov