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US 9,540,512 B2Granted
Low temperature preparation of rubber-modified asphalt cement
AssigneeWright Asphalt Products Company
InventorTheodore P Flanigan
Life of this patent
Estimating the term…
Abstract
This invention encompasses systems, methods, and apparatuses for low temperature preparation of rubber modified asphalt cement as well as resulting compositions.
Claims13
A method for preparing a rubber-modified asphalt cement composition, comprising:
- i) contacting asphalt with rubber granules to form a mixture;
- ii) heating the mixture to a temperature in the range of 450° F. to 510° F. to form a heated mixture;
- iii) mixing at least a portion of the heated mixture with rubber granules in a pre-wet vessel comprising a mixer to form a heated wetted asphalt/rubber mixture;
- and
- iv) passing the heated wetted asphalt/rubber mixture through at least one high shear mixer, wherein the rubber-modified asphalt cement composition has an integration value of at least 90.
2 more elements
A system for preparing a rubber-modified asphalt cement composition, comprising:
- i) an asphalt charging device for charging asphalt into the system;
- ii) a rubber charging device for charging rubber granules into the system;
- iii) at least one heater for heating the charged asphalt, the charged rubber granules, or a mixture thereof to a temperature in the range of 450° F. to 510° F.;
- iv) at least one pre-wet vessel comprising a mixer to form a wetted asphalt/rubber mixture from the charged asphalt and charged rubber granules;
- v) at least one high shear mixer for mixing the wetted asphalt/rubber mixture into the rubber-modified asphalt cement composition;
- and
- vi) a controller for controlling the asphalt charging device, the rubber charging device, and/or the at least one high shear mixer, in a manner such that the rubber-modified asphalt cement composition has an integration value of at least 95.
4 more elements
Dependencies are inferred from the claim text.