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US 12,270,138 B2Granted
Additive to improve properties of asphalt cement concrete and method of manufacturing thereof
AssigneeSurface Tech LLC
InventorSteven Santa Cruz
Life of this patent
Estimating the term…
Abstract
Reinforcing filaments or fibers, such as aromatic polyamide (aramid) fibers, can be reliably measured and consistently mixed into asphalt cement concrete by soaking the fibers in a wetting agent, then severing them to a desired length, and mixing the segments with other ACC ingredients. The wetting agent holds the fibers together loosely, so they can be distributed more uniformly throughout the ACC without clumping. The wetting agent soaks into the ACC mixture and/or evaporates, leaving the reinforcing fibers behind.
Claims20
Aramid fiber bundle segments formed by a method comprising:
- soaking, continuously, different portions of a plurality of continuous aramid fibers in a length direction of the plurality of continuous aramid fibers, in a liquid;
- pulling, continuously, the different portions of the plurality of continuous aramid fibers from the liquid to produce continuous portions of a wet continuous aramid fiber bundle, while wringing by the pulling, continuously, excess liquid from continuous portions of the wet continuous aramid fiber bundle, by applying a level of tension, continuously, to the wet continuous aramid fiber bundle, to increase a ratio of weight of fiber to liquid of the continuous portions of the wet continuous aramid fiber bundle, so that a filament-air interface surface tension in the continuous portions is greater than a filament-liquid interface surface tension in the continuous portions;
- severing the continuous portions of the wringed continuous aramid fiber bundle, continuously after wringing the excess liquid, into aramid fiber bundle segments, each bundle segment of the aramid fiber bundle segments consisting of a plurality of aramid filament segments soaked in liquid and wringed.
An additive for asphalt cement concrete, comprising:
- a plurality of aramid fiber bundles soaked with a wetting agent, each bundle comprising a plurality of aramid filaments of similar length bound together by surface tension of the wetting agent,
- wherein a filament-air interface surface tension in bundles among the plurality of aramid fiber bundles is greater than a filament-liquid interface surface tension in the bundles,
- wherein a ratio of weight of the plurality of fiber to weight of the wetting agent is about 3:1.
Dependencies are inferred from the claim text.