Masonry preservatives, except paints and oils; brickwork preservatives, except paints and oils; agglutinants for concrete; concrete preservatives, except paints and oils; chemical products for preventing scale; cement-waterproofing chemicals, except paints; cement preservatives, except paints and oils; damp-proofing chemicals, except paints, for masonry; concrete-aeration chemicals; preservatives for tiles, except paints and oils