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Rubberized asphalt pellets

A technology of asphalt granules and granules, applied in coatings, building components, building insulation materials, etc., can solve the problems of lengthy and expensive preparation of asphalt pavement

Inactive Publication Date: 2011-04-20
威廉·R·拜莱
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Currently, the preparation of asphalt pavements is tedious and expensive, and requires a lot of energy to heat the asphalt and maintain the temperature of the liquid asphalt

Method used

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  • Rubberized asphalt pellets
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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0064] The method of producing rubberized asphalt pellets may include grinding waste rubber, such as scrap tire rubber, into fine particles for use in making asphalt pellets. The rubber particles of the present invention include emulsified rubber and / or rubber particles agglomerated with bitumen to form particles. Rubber is ground to a particle size that can range from fine aggregate size to smaller than particle size. The particles are preferably formed from a plurality of rubber particles. This includes at least 2 or more rubber particles, more preferably about 2 to 10 rubber particles, more preferably about 5 to about 50 rubber particles, most preferably about 10 to 100 or more rubber particles.

[0065] Tire rubber used in the manufacture of asphalt / rubber adhesives is available in a variety of sizes. However, it may be advantageous to grind the rubber to less than about 8 mesh, more preferably less than about 14 mesh, most preferably less than about 20 mesh.

[0066] c...

Embodiment 1

[0201] Nuclei for asphalt pellets were prepared using a pan pelletizer and related methods. Briefly, a supply of fine aggregate is added to the turntable of a pan pelletizer in an amount capable of forming granules. Then, the liquefied pavement-grade asphalt is dripped or sprayed onto the fine aggregate. Pellets are formed by repeated contact of droplets of bitumen with fine aggregate, which, when sufficiently sized, overflow the rim of the pelletizer. The average size of the particles is expected to be 0.62 cm.

[0202] Alternatively, the fines are poured into a falling curtain of fines and the binder is sprayed into the fines to create granules. Optionally, atomization and wax coating may be alternately performed to provide core-shell bitumen particles.

Embodiment 2

[0204] A series of particle cores with different compositions were prepared according to the protocol of Example 1 with minor modifications. Briefly, liquefied rubber asphalt-based binders of different compositions were added to fine aggregates. The feed rate of fine aggregate and / or binder is varied to vary the size and composition of the particles. The expected shape, size (average diameter) and composition of the particle cores are shown in Table 1 below:

[0205] Table 1

[0206]

[0207]

[0208]

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Abstract

A storage-stable rubberized asphalt paving pellet can include fines in the core. The core can be an asphalt-based binder at about 70% to about 95% by weight of the core. The asphalt-based binder can include: ground tire rubber from about 15% to about 30% by weight of the asphalt-based binder, and pavement grade asphalt from about 85% to about 70% by weight of the asphalt based binder. The core can include fines at about 30% to about 1% by weight of the core. The shell coating the core can provide the pellet with a maximum dimension of about 1 / 16 inch to about 2 inches. The shell can include a water-resistant polymer or wax, or a coating of fines. In one aspect, the fines are lime fines or ground asphalt pavement fines. Optionally, the fines can be mineral or rock fines as described herein.

Description

[0001] Related Application Cross Reference [0002] This application claims priority to US Provisional Patent Application 61 / 093,193, filed August 29, 2008, entitled "RUBBERIZED ASPHALT PELLETS," inventor William R Bailey, which is hereby specifically incorporated by reference in its entirety. Background of the invention [0003] Asphalt road surfaces are well known and have been used for many years. Typically, asphalt pavements include aggregate and asphalt cement mixed together known as hot mix asphalt (HMA). Asphalt cements are hydrocarbon-rich substances, such as bitumen or prepared from bitumen, and are used to bind aggregates into road surfaces. The type and amount of aggregate can vary, and the aggregate provides structural reinforcement and durability to the HMA. While asphalt cement is used as the continuous phase to bind the aggregate together, it is known that various additives such as carbon black, fibers or lime can be used to improve the durability and life of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L95/00
CPCC08L95/00B29B9/06B29B9/12B29B9/16B29B2009/163C08L2555/22C08L2555/34Y02A30/30C08L2666/08C08L17/00
Inventor 威廉·R·拜莱
Owner 威廉·R·拜莱
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