01478809

Component

https://doi.org/10.3141/2371-04

http://scholar.google.com...shai&publication_year=2013

Traditionally, asphalt rubber (AR) mixtures have been difficult to produce. Their production requires specialized plants and equipment, which has resulted in their high cost to manufacture. In part this difficulty is due to the need to produce AR binder by blending it at high temperatures for a significant period of time (typically at about 190°C for 45 min to 1 h). The complexities in the process have caused AR mixes to be significantly more expensive to produce than conventional paving mixtures. A new technology that produces a reacted and activated rubber (RAR), which is an elastomeric asphalt extender, has been developed by hot blending and activation of a rubber granulate with a selected asphalt binder and activated mineral binder stabilizer. RAR achieves results comparable to those of other types of polymer modified binders (PMBs). However, a principal advantage of RAR is that it can be added easily to any hot-mix asphalt manufacturing facility with systems designed to feed particulate material into a batch plant (pugmill) or drum mix plant. This paper describes how RAR is produced from raw constituent materials. Various binder tests contrast performance with typical paving grades and PMBs used in the United States. The implementation of RAR in various types of asphalt mixtures is discussed, and demonstrative examples of test results are provided. Tests on mixtures in wheel tracking and fatigue demonstrate how the binder performance tests translate into mixture performance. In all cases evaluated, the RAR mixtures outperformed nonmodified and even conventional rubber modified equivalent materials.

01500961

13-2941

English

pp 32–40

2013

Transportation Research Record: Journal of the Transportation Research Board

9780309286947

Print

Figures (7) ; References (8) ; Tables (1)

Asphalt mixtures; Asphalt rubber; Bituminous binders; Elastomer modified asphalt; Extenders; Hot mix asphalt; Performance tests; Polymer asphalt

Highways; Materials; Pavements; I31: Bituminous Binders and Materials

TRIS, TRB, ATRI

Feb 5 2013 12:36PM

• Asphalt Binder Contribution to Mixture Workability and Application of Asphalt Lubricity Test to Estimate Compactability Temperatures for Warm-Mix Asphalt
• Assessment of Warm-Mix Asphalt for Heavy Traffic Airfields
• Effects of Changing Virgin Binder Grade and Content on High Reclaimed Asphalt Pavement Mixture Properties
• Evaluation of Environmental Susceptibility of Bituminous Mastic Viscosity as a Function of Mineral and Biomass Fillers
• Forensic Study on the Cracking of New Jersey’s Long-Term Pavement Performance Specific Pavement Study Sections
• Influence of Hydrogreen Bioasphalt on Viscoelastic Properties of Reclaimed Asphalt Mixtures
• Laboratory Evaluation of Asphalt Mixtures That Contain Biobinder Technologies
• Long-Term Performance of Pavement with High Recycled Asphalt Content: Case Studies
• Low-Temperature Performance Characterization of Biomodified Asphalt Mixtures That Contain Reclaimed Asphalt Pavement
• Modeling of the Resilient Modulus for Recycled Asphalt Pavement Applications in Base Course Layers
• Moisture Damage Evaluation of Asphalt Mixes That Contain Mining Byproducts: Results from Traditional and Fracture Energy Tests
• Performance Characterization of Asphalt Mixtures at High Asphalt Binder Replacement with Recycled Asphalt Shingles
• Performance Enhancement of Crumb Rubber–Modified Asphalts Through Control of the Developed Internal Network Structure