01587435

Component

https://doi.org/10.3141/2505-11

Asphalt binder is subjected to aging during the construction process and service life of pavement. Aging substantially changes the chemical composition and physical properties of asphalt and leads to premature distresses on pavement. It is speculated that crumb rubber modifier (CRM) reduces the susceptibility of asphalt to aging, but its mechanism is not fully understood. Also, the impact of interaction parameters and exchange of components on the aging behavior of a crumb rubber–modified binder is not fully understood. In this study, the effect of CRM on the short-term aging of asphalt was investigated through an analysis of the distinctions between the impact of different CRM activities (e.g., swelling and dissolution) on the oxidization process of asphalt. The crumb rubber–modified binder and its extracted liquid phase were aged with the use of a rolling thin-film oven. Physical and analytical tests (e.g., dynamic shear rheometer, Fourier transform infrared spectroscopy) were performed before and after aging. The results revealed that CRM affected the short-term aging behavior of asphalt in two ways. First, CRM retarded asphalt oxidization through the release of antioxidants. Second, CRM continued to interact with asphalt during its aging through absorption of aromatics and swelling. The results indicated that, through the accurate control of the interaction conditions, a modified asphalt could be produced with antiaging behavior superior to that of neat asphalt. Moreover, the results showed that an increase in the mixing and compaction temperature of hot-mix asphalt was not a good remediation of the high-temperature workability problem with the crumb rubber–modified binder because it significantly affected the nature of the composite.

01587029

15-4305

English

pp 84–91

2015

Transportation Research Record: Journal of the Transportation Research Board

9780309369312

Print

Figures (7) ; References (23) ; Tables (2)

Aging (Materials); Asphalt; Asphalt additives; Asphalt rubber; Crumb rubber; Oxidation

Highways; Materials; Pavements; I30: Materials

TRIS, TRB, ATRI

Dec 30 2014 1:24PM

• Alternative Approach Toward the Aging of Asphalt Binder
• Asphalt Concrete Layer to Support Track Slab of High-Speed Railway
• Backcalculation of Swollen Crumb Rubber Modulus in Asphalt Rubber Binder and Its Relation to Performance
• Comparison of Concentric Cylinder and Parallel Plate Geometries for Asphalt Binder Testing with a Dynamic Shear Rheometer
• Effect of Aging on Adhesion Properties of Asphalt Mixtures with the Use of Bitumen Bond Strength and Surface Energy Measurement Tests
• Effects of Asphalt Source, Asphalt Grade, and Inclusion of Additives on Asphalt Foaming Characteristics
• Effects of Stress Levels on Creep and Recovery Behavior of Modified Asphalt Binders with the Same Continuous Performance Grades
• Field Validation of a Thermal Cracking Resistance Specification Framework for Modified Asphalt
• Improved Practical Model for Permeability and Implications for the Design of High-Performance Hot-Mix Asphalt
• Modification of the Resistivity-Rutting Model to Use Recoverable Creep Compliance
• Prediction of Rheological and Damage Properties of Asphalt Binders That Result from Oxidative Aging
• Rheological and Chemical Characterization of Biobinders from Different Biomass Resources
• Rheological Indexes: Phenomenological Aspects of Asphalt Binder Aging Evaluations
• Study of Asphalt Aging Through Beam Fatigue Test
• Wetting Characteristics of Asphalt Binders at Mixing Temperatures