01478656

Component

https://doi.org/10.3141/2371-06

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

The sustainability movement in paving materials has led to the increased use of reclaimed asphalt pavement (RAP). New developments in this area in the recent past include the use of biomodified asphalt binders (BMBs) such as those containing bio-oils derived from swine manure. The study reported in this paper examined the low-temperature properties of RAP and virgin BMB mixtures to determine if these mixtures exhibited better low-temperature performance than conventional hot-mix asphalt (HMA). Disk-shaped compact tension [DC(T)], Superpave® indirect tension (IDT), and acoustic emission (AE) tests were employed to characterize low-temperature properties of the asphalt mixtures. BMB mixtures exhibited higher DC(T) fracture energies than HMA at all RAP levels. In addition, BMB mixture fracture energy displayed a reduced dependence on RAP content. The difference in average fracture energy between BMB and HMA mixtures increased with higher RAP contents. Furthermore, BMB mixtures displayed consistently higher creep compliance, which indicated that these mixtures could alleviate thermal stresses more easily than HMA. A recently developed AE testing procedure evaluated the effects of BMB as well as RAP in the mixtures. The overall trends identified through AE testing were consistent with the findings from the DC(T) and IDT tests. In addition, AE results suggested a fundamental change in the behavior of the BMB RAP mixture relative to the HMA RAP mixture (i.e., rejuvenating effect). In general, it was observed that BMB RAP mixtures exhibited low-temperature cracking behavior superior to that of HMA mixtures.

01500961

13-3773

English

pp 49–57

2013

Transportation Research Record: Journal of the Transportation Research Board

9780309286947

Print

Figures (5) ; References (31) ; Tables (5)

Asphalt mixtures; Binders; Hot mix asphalt; Low temperature tests; Pavement performance; Reclaimed asphalt pavements; Recycled materials

Bio-binders; Sustainable pavements

Highways; Materials; Pavements; I31: Bituminous Binders and Materials; I33: Other Materials used in Pavement Layers

TRIS, TRB, ATRI

Feb 5 2013 12:44PM

• 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
• 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
• Reacted and Activated Rubber: Elastomeric Asphalt Extender