GB216602A - Improvements in or relating to compositions suitable for making or waterproofing roads - Google Patents

Abstract

216,602. Meadows, S. C. March 10. 1923. Compositions containing bituminous materials and india-rubber for making and waterproofing roads are obtained by adding to a bituminous or tarry base either rubber treated with a solvent or softening agent or rubber mixed with vulcanizing-agents. Petroleum residues may be added to increase flexibility, and filiers, such as sand, ground limestone, asbestos powder, and sawdust mav be used. Resinous rubbers such as pontianak and jelutong may be used, or rubber may be replaced by gutta-percha or balata. Compositions containing not more than 2¢ per cent of rubber can be applied in the melted state; those containing more than this amount are relatively infusible and may be cast into blocks. An example of a waterproofing-composition consists of 99.25 per cent of a tar base composed of 75 parts coal tar, 10 parts anthracene oil, 10 parts bitumen, and.4 parts petroleum residue, together with 0.75 per cent of rubber previously softened with solvent naphtha, tar oil, anthracene resins, paraffin wax, &c. A composition for mixing with sand consists of the same tar base with 1.25-2.5 per cent of rubber and a small proportion of sulphur, and is heated to vulcanize the rubber content. Specification 216,245 is referred to.