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Polymers and their use in asphalt compositions and asphalt concretes

a technology of polymers and compositions, applied in the field of polymers and their use in asphalt compositions and asphalt concretes, can solve the problems of failure, however, inevitable, fattening, cracking,

Inactive Publication Date: 2006-04-06
FIRESTONE POLYMERS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006] There is therefore a continued need to improve the asphalt compositions and asphalt concretes.

Problems solved by technology

While asphalt concretes have proven useful in the preparation of road surfaces, failure is, however, inevitable.
Failures generally occur through bleeding, fatting up, cracking, and chip loss.
Unfortunately, failure frequently occurs at shorter time intervals than desired.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0014] In a first embodiment, the invention provides a modified asphalt composition that includes a naphthenic asphalt and high-vinyl block copolymer. This modified asphalt composition can be used to prepare asphalt concretes that are especially useful for paving roadways, highways, exit ramps, streets, driveways, parking lots, airport runways or airport taxiways utilizing conventional procedures.

[0015] It has been unexpectedly discovered that the mixture or combination of naphthenic asphalt and the high-vinyl block copolymer overcomes some of the shortcomings associated with modifying naphthenic asphalts. In particular, surprisingly good results have been observed as compared to asphalts modified with conventional block copolymers when these compositions are subjected to the Softening Point Separation Test, which is preferred under the Superpave System of the Strategic Highway Research Program. It is believed that the high-vinyl block copolymer and the naphthenic asphalt synergisti...

second embodiment

[0048] In a second embodiment, the invention provides an asphalt concrete composition that includes an asphalt, a functionalized block copolymer, and a siliceous aggregate. This asphalt concrete is especially useful for paving roadways, highways, exit ramps, streets, driveways, parking lots, airport runways or airport taxiways utilizing conventional procedures.

[0049] It has been unexpectedly discovered that the use of the functionalized block copolymer can alleviate some of the shortcomings that are associated with the use of siliceous aggregate in preparing asphalt concrete. In particular, the resulting pavement is surprisingly characterized by less cracking and crumbling than similar pavements that employ siliceous aggregated and unfunctionalized block copolymer and unfunctionalized block copolymers. It is believed that the siliceous aggregate synergistically interacts with the functionalized block copolymer to provide these advantageous results. These advantages can prove to be s...

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Abstract

A modified asphalt composition comprising a naphthenic asphalt, and a high-vinyl block copolymer is presented. The modified asphalt composition is prepared by combining a naphthenic asphalt and a high-vinyl block copolymer. Further an asphalt concrete is presented, such concrete comprises an asphalt, a functionalized block copolymer, and a siliceous aggregate. A diblock copolymer is presented, such copolymer comprises a vinyl block comprising conjugated vinyl aromatic units, a diene block comprising conjugated diene units and substantially devoid of a tapered block section between the vinyl block and the diene block wherein the diblock copolymer comprises a vinyl content of at least about 20%, and a molecular weight of at least about 50,000.

Description

[0001] This application references Provisional Application No. 60 / 615,438, filed on Oct. 2, 2004. The entire disclosure of this referenced provisional application is hereby incorporated by reference.FIELD OF THE INVENTION [0002] This invention relates to polymers and their use in asphalt compositions and asphalt concretes. BACKGROUND OF THE INVENTION [0003] It is known to combine bitumen compositions, particularly asphalt compositions, with aggregate to form compositions that are useful in the preparation of road surfaces. The mixture of asphalt and aggregate may be referred to as asphalt concrete. The asphalt serves as a binder for the aggregate. Interaction between the binder and the aggregate is therefore desirable. [0004] The asphalt may itself be reinforced or modified with a polymer. The polymer can improve many properties of the asphalt such as penetration, softening point, toughness, tenacity, and heat resistance. Known polymers or polymeric additives include symmetric radic...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): E01C7/26
CPCC08L53/00C08L53/02C08L95/00E01C7/265C08L2666/24E01C7/26
Inventor GRAVES, DANIEL F.BOERNER, PETER W.
Owner FIRESTONE POLYMERS LLC
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