01616129

Component

https://doi.org/10.3141/2574-08

The use of reclaimed asphalt pavements (RAP) and recycled asphalt shingles (RAS) in pavements has already become a norm in the United States because of the substantial reduction in construction cost, energy consumption, and greenhouse gas emissions. However, highway agencies are still reluctant to increase the overall percentage of RAP and RAS in asphalt pavement mixtures because of a higher potential of premature cracking in these pavements. To avoid early pavement failures and untoward maintenance cost, rejuvenators are being increasingly used in asphalt mixtures to reconstruct the chemical structures of oxidized RAP and RAS binders. However, the overall effects of rejuvenators on the properties of asphalt binders have not been well studied in recent years and used in determining the optimum dosages for different rejuvenators. This study characterizes the effects of rejuvenators on the rheological, chemical, aging, rutting, and cracking properties of asphalt binders containing recycled binders and then uses the findings to recommend optimum dosages. To that end, PG 64-22 virgin binders were blended with different types of rejuvenators and recycled binders at various concentrations. Laboratory test results showed that rejuvenators could reduce the stiffness, oxidation, and cracking potential of these blends. Results also suggested that selecting the rejuvenator dosage and type on the basis of only one criterion could not meet the specifications of traditional virgin binders. In addition, the results showed that different rejuvenators worked differently with different mixtures.

01616111

16-4126

English

pp 74-82

2016

Transportation Research Record: Journal of the Transportation Research Board

9780309441148

Print

Figures; References; Tables

Aging (Materials); Asphalt pavements; Binders; Chemical properties; Recycled materials; Rheological properties

Highways; Materials; Pavements

TRIS, TRB, ATRI

Nov 4 2016 9:12AM

• Blending Measurements in Mixtures with Reclaimed Asphalt: Use of Scanning Electron Microscopy with X-Ray Analysis
• Detection and Estimation of Re-Refined Engine Oil Bottoms in Asphalt Binders: Texas Department of Transportation’s Approach with Wavelength Dispersive X-Ray Fluorescence Spectroscopy
• Direct Tensile Test to Assess Healing in Asphalt
• Effect of Polymer and Oil Modification on the Aging Susceptibility of Asphalt Binders
• Evaluating Diffusion and Aging Mechanisms in Blending of New and Age-Hardened Binders During Mixing and Paving
• Fatigue Performance of Re-Refined Engine Oil Bottom–Modified Asphalt: Laboratory Study
• High-Temperature Properties of Asphalt Binders: Comparison of Multiple Stress Creep Recovery and Performance Grading Systems
• Investigation on the Development of Asphalt Mixture Limit Criteria for Low-Temperature Cracking
• Measuring Adhesion Between Modified Asphalt Binders and Aggregate Minerals: Use of Particle Probe Scanning Force Microscopes
• Quantifying the Thermomechanical Response of Bitumen from Microphase Properties
• Rolling Thin Film Oven Test and Pressure Aging Vessel Conditioning Parameters: Effect on Viscoelastic Behavior and Binder Performance Grade
• Study of Evolution of Asphalt Binder Microstructure Resulting from Aging and Tensile Loading
• Study of Moisture Impact on Asphalt Before and After Oxidation Using Molecular Dynamics Simulations
• Temperature Effects of Linear Amplitude Sweep Testing and Analysis