TY JOUR TI PHOTOCATALYTIC ACTIVITY OF GYPSUM–CEMENT–POZZOLANIC SYSTEMS MODIFIED WITH TITANIUM DIOXIDE NANOPARTICLES KW photocatalysis KW titanium dioxide (TiO₂) KW construction materials KW self-cleaning KW organic pollutants KW environmentally friendly composites JO Technique and technology of silicates AU Kryazhikov, I.A. AU Pichugin, A.P. PY 2026 IS 33 PB Individual Entrepreneur Svetlana Vasilievna Samchenko