TY JOUR TI CORRECTION OF THE Si/Al RATIO TO OBTAIN POROUS GEOPOLYMERS WITH IMPROVED PHYSICAL AND MECHANICAL PROPERTIES KW porous geopolymer KW ash and slag waste KW cullet KW sand KW Novocherkassk State District Power Plant KW Severodvinsk Thermal Power Plant-1 JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Trofimov, S.V. PY 2025 IS 10 PB Belgorod State Technological University named after V.G. Shukhov