GB317496A - An improved cold asphalt and application thereof - Google Patents

Abstract

317,496. Imray, O. Y., (I. G. Farbenindustrie Akt.-Ges.). March 16, 1928. Emulsion, making.-Bituminous dispersions of a somewhat coarse nature are prepared by the use as dispersing agents of water-insoluble humic acid or substances containing humic acid, the products being mixed with road-making materials or with materials such as plaster of Paris to form waterproof coverings. The substance defined as " containing humic acid " comprise (1) aqueous suspension of the raw material, such as Cassel brown, peat or decayed vegetable matter, from which humic acid is extracted; (2) products prepared by oxidizing coal, coal-tar pitch or the like, with nitric acid, chromic acid or the like; (3) oxidation or chlorination products of the substances referred to in (1); (4) calcium, magnesium, aluminium, iron or other insoluble salts of the compounds referred to in (J), (2) and (3). Examples of the invention are as follow (1) To 100 parts of brown coal, finely ground with 50 parts of water, are added with stirring 500 parts of Mexican bitumen and 350 parts of water. The mixture is applied to the road by means of a water-cart and is then covered with basalt chips. (2) 100 parts of brown coal, 30 parts of slaked lime and 120 parts of water are ground together and 500 parts of a mixture comprising 150 parts of tar, 350 parts of Mexican bitumen and 250 parts of water are slowly added. The product is mixed with 4,000 parts of basalt road metal, 3,000 parts of basalt chips and 2,000 parts of sand to form a road surfacing composition. (3) 500 parts of Mexican asphalt at 90‹ C. are added, with 350 parts of cold water to 150 parts of finely ground 30 per cent humic-acid paste. equal parts of basalt chips and sand are mixed with 12 per cent of the above product and 5 per cent of cement to form of a composition which may be applied to and rolled on roads and the like. The cement causes a rapid solidification of the mass. (4) To the mixture as in (3) 5 per cent of crude gas-tar are added. The mixture is thereby rendered quicker setting. (5) Waterproof gypsum boards for covering walls, ceilings &c. are made by coating a framework of reeds or laths with plaster of Paris containing 10-20 per cent of the product obtained in (3). (6) 100 parts of coal are digested at ordinary and then at elevated temperature with 100 parts of 50 per cent nitric acid until evolution of red vapour ceases. The mass is then washed with water and the insoluble residue dissolved in caustic soda solution and precipitated with hydrochloric acid. The resulting blaakish-brown paste is washed and filtered. 50 parts of the product are mixed with 200 parts of molten tar, containing 60 per cent tar pitch and 40 per cent anthracene oil, and 150 parts of water, to form an emulsion which may be mixed with 50 times its weight of basalt chips.