01553433

Component

https://doi.org/10.3141/2506-09

Asphalt rubber has been commonly used in the United States for modifying asphalt binder. There have been several studies on improving the interaction and adhesion between rubber and asphalt matrix. The modification of asphalt binder with crumb rubber (CR) is mainly controlled by the exchange equilibrium between components of asphalt binder and CR. This phenomenon increases the size of rubber particles (swelling) up to three times their original size and leads to a significant increase in the viscosity of the resulting asphalt. Swelling and increased viscosity not only promote separation of the modified matrix into two distinguishable phases but also increase the difficulty of pumping and application of rubberized asphalt. This study investigated the effectiveness of treating rubber with an amide-enriched biomodifier to facilitate breakage of disulfide bonds in rubber polymer while promoting interactions between free radicals and amide groups of biomodifier. Promoting interactions between rubber polymer and asphalt aromatic compounds by adding a biomodifier could alleviate phase separation while enhancing overall matrix elasticity. This modification enhanced the rheological properties of rubberized asphalt, including high-temperature properties as well as its palpability. The rotational viscometer and dynamic shear rheometer were used to evaluate the effect of biomodifier on the rheological properties of asphalt rubber at high and intermediate temperatures. Fourier transform infrared spectroscopy was used to examine the presence of rubber polymer compounds inside the asphalt matrix. The results showed that introduction of biomodifier facilitated the application of higher CR percentages while improving the overall rheological properties of the asphalt rubber.

01596058

15-5446

English

pp 81–89

2015

Transportation Research Record: Journal of the Transportation Research Board

9780309369299

Print

Figures (10) ; References (27) ; Tables (1)

Asphalt rubber; Bituminous binders; Crumb rubber; Physicochemical properties; Rheological properties

Bio-modification

Highways; Materials; Pavements

TRIS, TRB, ATRI

Dec 30 2014 1:50PM

• Characterization of Adhesion and Healing at the Interface Between Asphalt Binders and Aggregate Using Atomic Force Microscopy
• Correlating Laboratory Test Methodologies to Measure Skid Resistance of Pavement Surfaces
• Development of an Analytical Model to Predict the Field Permeability of Asphalt Pavements
• Effect of Mineral Fillers on the Oxidative Aging of Asphalt Binders: Laboratory Study with Mastics
• Effect of Recycling Agents on the Laboratory Performance of Asphalt Mixtures Containing Recycled Asphalt Shingles
• Effect of Water Content on Binder Foaming Characteristics and Foamed Mixture Properties
• Fatigue and Rutting Evaluation of Laboratory-Produced Asphalt Mixtures Containing Reclaimed Asphalt Pavement
• Fatigue Performance Evaluation of Rubberized Porous European Mixture by Simplified Viscoelastic Continuum Damage Model
• Improved Methodology to Evaluate Fracture Properties of Warm-Mix Asphalt Using Overlay Test
• Laboratory Tests and Numerical Simulations of Mixing Superheated Virgin Aggregate with Reclaimed Asphalt Pavement Materials
• Nanomechanical Evaluation of Vapor-Conditioned and Unconditioned Asphalt
• Numerically Supported Experimental Determination of the Behavior of the Interlayer Bond in Asphalt Pavement
• Precision of the Hamburg Wheel-Track Test
• Quantitative Characterization of Binder Blending: How Much Recycled Binder Is Mobilized During Mixing?
• Use of the Resilient Modulus Test to Characterize Asphalt Mixtures with Recycled Materials and Recycling Agents