Asphalt compounds and method for asphalt reconditioning using microwave radiation
AssigneeThe Titan Corporation
InventorsTracy L. Osborne, William R. Hutcheson
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Abstract
An improved asphalt composite utilizes a mixture of asphalt and a lossy microwave absorptive material normally in a granular form and dispersed homogeneously throughout the asphalt matrix. The use of a microwave material, particularly one having a Curie temperature in the range of about 100.degree. C., enhances removal, reconditioning and reforming the asphalt during patching or repair operations which rely upon microwave radiation heating.
Claims13
A composite for paving comprising, in combination:
- a mixture of asphalt and a lossy microwave absorptive material, said lossy microwave absorptive material being dispersed in the asphalt for enhancement of heat dispersal in the mix when the mix is exposed to microwave radiation, said lossy microwave material being selected from the group consisting of spinel ferrites, hexagonal ferrites and mixtures thereof and comprising from one percent (1%) to twenty-five percent (25%) by weight of said mix.
An improved method for fabricating a repairable asphaltic paving material comprising the steps of:
- (a) measuring a volume of asphalt;
- (b) adding a volume of lossy microwave absorptive material selected from the group consisting of spinel ferrites, hexagonal ferrites and mixtures thereof to the asphalt to form a mix wherein;
- and
- (c) mixing the asphalt and the absorptive material to disperse the absorptive material in the matrix of the asphalt from one percent (1%) to twenty-five percent (25%) of the mix is comprised of said lossy microwave absorptive material.
A composite for paving comprising in combination:
- a mixture of asphalt and a lossy microwave absorptive material, said lossy microwave material being dispersed in the asphalt for enhancement of heat dispersal in the mix when the mix is exposed to microwave radiation, said lossy microwave material comprising a ferrite material at least in part selected from the group consisting of spinel ferrites, hexagonal ferrites and mixture thereof, said lossy microwave material comprising from one percent (1%) to twenty-five percent (25%) of the mixture.
A composite for paving, comprising, in combination:
- a mixture of asphalt and from one percent (1%) to twenty-five (25%) of a lossy microwave material as an additive to the asphalt, said material being dispersed in the asphalt for enhancement of heat dispersal in the mix when the mix is exposed to microwave radiation, said lossy microwave material comprising a ferromagnetic material selected from the group consisting of spinel ferrites, hexagonal ferrites and mixtures thereof having a Curie temperature in the range of 50.degree. to 700.degree. C. and also having a high volume resistivity.
Dependencies are inferred from the claim text.