Asphalt products and methods of producing them for rejuvenation and softening of asphalt

Patent metadata

Field	Value
Publication number	US-11370918-B2
Application number	US-202016751520-A
Country	US
Kind code	B2
Filing date	Jan 24, 2020
Priority date	Aug 30, 2016
Publication date	Jun 28, 2022
Grant date	Jun 28, 2022

Abstract

The present invention relates to relates to a method of producing an improved asphalt. This method includes providing an asphalt binder and providing a compound of formula (I):as described herein. The asphalt binder is mixed with the compound of formula (I) under conditions effective to produce an improved asphalt. Also disclosed are an asphalt product and a method of making asphalt material.

First claim

What is claimed:

1. An asphalt product comprising:
an asphalt binder and
a compound of formula (I):

wherein:
each A is selected independently at each occurrence thereof from the group consisting of

 and
wherein at least one A is

n=1-12;
each

 represents the point of attachment to a —CH 2 — group;
R is selected from the group consisting of C 3 -C 23 alkyl and benzyl, wherein the C 3 -C 23 alkyl can be optionally substituted with an aryl, heteroaryl, or heterocyclyl;
R 1 and R 2 are independently selected from the group consisting of H, C 1 -C 23 alkyl and benzyl, wherein the C 1 -C 23 alkyl can be optionally substituted with an aryl, heteroaryl, or heterocyclyl; and
a mineral aggregate.

2. An asphalt product comprising:
an asphalt binder and
a compound of formula (I):

wherein:
each A is selected independently at each occurrence thereof from the group consisting of

and
wherein at least one A is

n=1-12;
each

represents the point of attachment to a —CH 2 — group;
R is selected from the group consisting of C 3 -C 23 alkyl and benzyl, wherein the C 3 -C 23 alkyl can be optionally substituted with an aryl, heteroaryl, or heterocyclyl;
R 1 and R 2 are independently selected from the group consisting of H, C 1 -C 23 alkyl and benzyl, wherein the C 1 -C 23 alkyl can be optionally substituted with an aryl, heteroaryl, or heterocyclyl,
fiberglass, and
a mineral aggregate.

3. A recycled asphalt pavement aggregate, wherein the improvement comprises an asphalt product comprising:
an asphalt binder and
a compound of formula (I):

wherein:
each A is selected independently at each occurrence thereof from the group consisting of

and
wherein at least one A is

n=1-12;
each

represents the point of attachment to a —CH 2 — group;
R is selected from the group consisting of C 3 -C 23 alkyl and benzyl, wherein the C 3 -C 23 alkyl can be optionally substituted with an aryl, heteroaryl, or heterocyclyl;
R 1 and R 2 are independently selected from the group consisting of H, C 1 -C 23 alkyl and benzyl, wherein the C 1 -C 23 alkyl can be optionally substituted with an aryl, heteroaryl, or heterocyclyl.

4. A method of making an asphalt material comprising the steps of:
(a) providing an improved asphalt product comprising:
an asphalt binder and
a compound of formula (I):

wherein:
each A is selected independently at each occurrence thereof from the group consisting of

and
wherein at least one A is

n=1-12;
each

represents the point of attachment to a —CH 2 — group;
R is selected from the group consisting of C 3 -C 23 alkyl and benzyl, wherein the C 3 -C 23 alkyl can be optionally substituted with an aryl, heteroaryl, or heterocyclyl;
R 1 and R 2 are independently selected from the group consisting of H, C 1 -C 23 alkyl and benzyl, wherein the C 1 -C 23 alkyl can be optionally substituted with an aryl, heteroaryl, or heterocyclyl, mixed with the asphalt binder, wherein the improved asphalt product has a complex shear modulus reduction of between 67% to 96% compared to that produced when the improved asphalt material is prepared in the absence of the compound of formula (I);
(b) mixing the improved asphalt product with a mineral aggregate to coat the mineral aggregate and produce a heated paving material which has a dynamic modulus reduction compared to that produced when the improved asphalt material is prepared in the absence of the compound of formula (I);
(c) applying the heated paving material to a surface to be paved to form an applied paving material, and
(d) compacting the applied paving material, to a void fraction of less than 8% to form a paved surface.

5. The method of claim 4 , wherein the compound of formula (I) is the compound of formulae (Ia)-(Ik):

6. The method of claim 4 , wherein the compound of formula (I) is selected from the group consisting of epoxidized benzyl soyate and epoxidized isoamyl soyate.

7. The method of claim 4 , wherein the improved asphalt product produced in step (a) has a high temperature performance grade measured at a temperature between about −28° C. to 116° C., wherein the high temperature performance grade of the improved asphalt product is achieved at a temperature, which is reduced by 3° C. to 90° C. compared to that produced by an improved asphalt product prepared in the absence of the compound of formula (I).

8. The method of claim 4 , wherein the improved asphalt product produced in step (a) has a low temperature performance grade measured at a temperature between about −16° C. to −40° C., wherein the low temperature performance grade of the improved asphalt product is achieved at a temperature, which is reduced by 3° C. to 60° C. compared to that produced by an improved asphalt product prepared in the absence of the compound of formula (I).

9. The method of claim 4 , wherein the asphalt binder is selected from the group consisting of unaged asphalt binder, aged asphalt binder from recycled asphalt pavement, vacuum tower distillation bottom binder, aged asphalt binder from recycled asphalt shingles, de-asphalting bottoms, residuum oil supercritical extraction unit bottoms, and mixtures thereof.

10. The method of claim 4 , wherein the mineral aggregate is selected from the group consisting of sand, gravel, limestone, quartzite, granite, crushed stone, recycled asphalt pavement (RAP), recycled asphalt shingles (RAS), and combinations thereof.

11. The asphalt material product of the method of claim 4 .

12. The method of claim 4 , wherein the mixing is carried out in a high speed shear mill at 100° C. to 150° C. and shear speeds at

Assignees

• Univ Iowa State Res Found Inc

Inventors

• Williams Ronald Christopher
• Podolsky Joseph H
• Hernandez Nacu
• Cochran Eric W
• Hohmann Austin
• Elkashef Mohamed

Classifications

• C08L2555/28

  Asphalt produced between 0°C and below 65°C, e.g. cold mix asphalt produced between 0°C and 35°C · CPC title

• C08L2555/24

  Asphalt produced between 100°C and 140°C, e.g. warm mix asphalt · CPC title

• E04D1/20

  of plastics; {of asphalt;} of fibrous materials · CPC title

• E01C7/265

  with rubber or synthetic resin, e.g. with rubber aggregate, with synthetic resin binder (for thin overlays or surface dressings E01C7/35) · CPC title

• C08J3/226

  using a polymer as a carrier · CPC title