01550204

Component

https://doi.org/10.3141/2506-03

Aging of asphalt binders is induced by chemical or physicochemical changes during production of pavement and throughout its service life. Although binder aging in pavement always occurs while binders are in contact with aggregates and mineral filler, in most laboratory aging studies and in current specifications, asphalt binders are individually aged without accounting for aggregate induced interactions. Past research has had conflicting findings, as it attributes mitigating or catalytic effects to the presence of mineral fillers in asphalt binders with oxidative aging. Thus, in the present study it was hypothesized that evaluation of asphalt oxidative aging without taking into account the interactive effect of the presence of mineral fillers was inadequate as a specification tool. The effect of mineral fillers on oxidative aging of asphalt was investigated with accelerated aging of mastics (asphalt and fillers) in a pressure aging vessel (PAV) and by measuring the changes in stiffness and glass transition temperature (Tg). The testing matrix included an aging evaluation of mastics containing different fillers, mineralogy, and surface area. The results showed that the low-temperature behavior of aged mastic could be modified by controlling filler concentration and type. The fillers acted as an agent adsorbing heavy fractions of asphalt binder and therefore reduced stiffness and changing Tg. During oxidative aging of asphalt binders and mastics, diffusion and adsorption mechanisms played a role in the rate of aging of asphaltic material. The results provided insight on the potential for selecting a mineral filler concentration and mineralogy type to reduce the impact of oxidative aging and possibly improve the service life of pavement.

01596058

15-3325

English

pp 19–31

2015

Transportation Research Record: Journal of the Transportation Research Board

9780309369299

Print

Figures (8) ; Photos; References (42) ; Tables (2)

Accelerated tests; Aging (Materials); Bituminous binders; Low temperature; Mastic asphalt; Mineral fillers; Mineralogy; Oxidation; Stiffness

Glass transition temperature; Pressure aging vessels

Highways; Materials; Pavements

TRIS, TRB, ATRI

Dec 30 2014 1:07PM

• Biomodification of Rubberized Asphalt and Its High Temperature Properties
• 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 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