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AssigneeIshihara Sangyo Kaisha, Ltd.
InventorsNOBORU NONOYAMA, HIROMI KOGA
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At least one part of a road surface is covered by a photocatalyst layer containing a photocatalyst such as titanium dioxide, etc. to purify pollutants in exhaust gases emitted from vehicles by photocatalytic reaction of the photocatalyst. Pollutant-originating matters as retained on the photocatalyst layer are washed away by rain water or sprinkled water. In one embodiment of the invention, road 12 is a road provided with a dewaterable pavement and rain water passes through surface layer 18 during raining, flows over and along base layer 16 and is discharged. In surface layer 18, numerous aggregates of small particle sizes 1802 are projected from the entire surface of concrete layer 1804. Titanium dioxide layer 20 is formed by injecting or spraying a mixture comprising titanium dioxide, cement, a filler and water onto the entire surface of surface layer 18 thinly and is water-permeable.
An air purification-functioning road wherein a photocatalyst layer comprising a photocatalyst and a retainer material for retaining the photocatalyst, being fixed to the surface of a road by a fixer material, and at least a part of the surface of the road being covered by the photocatalyst layer.
A method for purifying polluted air over a road, which comprises fixing a photocatalyst layer comprising a photocatalyst and a retainer material for retaining the photocatalyst to at least a part of the surface of a road by a fixer material, thereby covering the part of the road surface, purifying pollutants in exhaust gases emitted from vehicles by photocatalytic reaction of the photocatalyst and sprinkling water onto the road surface, thereby washing away pollutant-originating matters as retained on the photocatalyst layer.
Dependencies are inferred from the claim text.