MATERIAL FOR MANUFACTURING SURFACE PLATES Russian patent published in 1997 - IPC

FIELD: manufacture of building materials. SUBSTANCE: invention is dealing with plates used for roofing, facing, and as road material, coatings for marine and hydrotechnical constructions. Utilized composition contains (in wt %): Portland cement, 32.82-33.00; keramzite sand with intergrain void space not exceeding 30% and strength 9-10 MPa, 52.8-53.1; superplastisizer based on naphthalenesulfonic acid sodium salt with formaldehyde, 0.098-0.099; saponified wood tar, 0.0003-0.00033; water, the balance. Breaking load for plates is 85 kg, cold resistance up to 500 cycles, average density 1.5-1.6 g/cu. cm, roof weight (100 sq.m) 2640 kg. EFFECT: improved performance characteristics. 3 tbl