GOST 23735-79 and its successor, GOST 23735-2014, govern technical specifications for natural and enriched sand and gravel mixtures (PGS) used in construction, road surfaces, and foundations. These standards define requirements for gravel content (10% to 90%), maximum grain size (10 mm to 70 mm), and impurity limits for dust and clay. View the current GOST 23735-2014 specification or the 1979 archive version on regulatory portals.