Method for preparing asphalt paving material utilizing solid phase autoregenerative cohesion

Patent metadata

Field	Value
Publication number	US-10934669-B2
Application number	US-201816107951-A
Country	US
Kind code	B2
Filing date	Aug 21, 2018
Priority date	Mar 15, 2013
Publication date	Mar 2, 2021
Grant date	Mar 2, 2021

Abstract

A method for preparing a paving material includes heating an aggregate comprising recycled asphalt pavement using an emitter generating electromagnetic radiation having a wavelength of from 2 microns to 1 millimeter. The method utilizes solid phase autoregenerative cohesion to prepare a material suitable for use as an aggregate in a hot mix asphalt pavement installation.

First claim

What is claimed is:

1. A method for preparing an asphalt paving material, comprising:
providing an aggregate, wherein the aggregate comprises recycled asphalt pavement;
generating electromagnetic radiation having wavelengths of from about 1 nm to 5 mm by a resistance wire;
filtering the generated electromagnetic radiation through a birefringent material to produce a transmitted electromagnetic radiation, wherein the transmitted electromagnetic radiation possesses only a subset of the wavelengths of the generated electromagnetic radiation; and
heating the aggregate using only the transmitted electromagnetic radiation, whereby an asphalt paving material is obtained.

2. The method of claim 1 , further comprising providing an asphalt, wherein the asphalt is in a mixture with the aggregate.

3. The method of claim 2 , wherein the asphalt is a rubber asphalt.

4. The method of claim 2 , wherein the asphalt is in a form of an elastomer composition comprising butyl rubber, diene modified asphalt, and an environmentally hardened bioresin.

5. The method of claim 4 , wherein the elastomer composition comprises less than 1% perflurocarbons as a volatile component.

6. The method of claim 4 , wherein the elastomer composition comprises no perflurocarbons as a volatile component.

7. The method of claim 1 , wherein a wavelength in the subset of the wavelengths is from 2 microns to 1 millimeter.

8. The method of claim 1 , wherein a wavelength in the subset of the wavelengths is from about 20 nm to about 100 microns.

9. The method of claim 1 , wherein a wavelength in the subset of the wavelengths is from about 20 microns to about 100 microns.

10. The method of claim 1 , wherein the asphalt paving material comprises 95% aggregate and 5% asphalt.

11. The method of claim 1 , wherein the heating is to a temperature of from about 350° F. to about 400° F.

12. The method of claim 2 , further comprising:
prior to the heating, laying the mixture of asphalt and aggregate down over a base to form a first layer of lift, wherein, during the heating, a highest temperature in the lift does not exceed 275° F., and wherein a minimum temperature in the lift is at least 200° F.; and
compacting the first layer of lift, whereby a hot asphalt pavement is installed.

13. The method of claim 12 , further comprising laying down and compacting one or more additional layers of lift atop the first layer of lift.

14. The method of claim 13 , wherein the first layer of lift and the one or more additional layers of lift have a thickness of approximately 12 inches.

15. The method of claim 13 , wherein no primer or additional material is put between the layers of lift.

16. The method of claim 12 , wherein the base is an existing asphalt or concrete pavement in need of repair.

17. The method of claim 12 , wherein the base is an earthen base, the method further comprising covering the earthen base with gravel and grading and compacting the gravel.

18. The method of claim 12 , wherein the first layer of lift is 2 inches to 3 inches in thickness.

19. The method of claim The method of claim 1 , wherein the heating produces no smoke.

Assignees

• Coe William B

Inventors

• Coe William B

Classifications

• C08L2555/34

  Recycled or waste materials, e.g. reclaimed bitumen, asphalt, roads or pathways, recycled roof coverings or shingles, recycled aggregate, recycled tires, crumb rubber, glass or cullet, fly or fuel ash, or slag · CPC title

• E01C7/36

  by subjecting soil to stabilisation {(E01C7/06 takes precedence; foundations E01C3/04; soil conditioning or soil stabilising materials C09K17/00; soil stabilisation devices for road construction E01C21/00)} · CPC title

• E01C7/187

  Repairing bituminous covers, e.g. regeneration of the covering material in situ, application of a new bituminous topping (application of thin surface layers with other binders E01C7/35; repairing pavings in general E01C11/005) · CPC title

• G21K5/02

  having no beam-forming means · CPC title

• E01C23/04

  Devices for laying {inserting or positioning} reinforcing elements or dowel bars {with or without joint bodies (installing or inserting joint bodies per se E01C23/023, E01C23/026)}; Removable supports for reinforcing {or load transfer} elements (non- removable supports therefor {E01C11/02} E01C11/16; side forms adapted to supporting reinforcement E01C19/50); Devices, e.g. removable forms, for making essentially horizontal ducts in paving, e.g. for prestressed reinforcements · CPC title