01554083

Component

https://doi.org/10.3141/2505-04

Awareness that natural, financial, and energy resources are scarce goods has increased. Thus demand is growing for infrastructure that is not only of high quality but also efficient. Efficiency, in this case, aims to optimize cost and energy consumption over the complete life cycle of a structure. The objective is to build long-lasting infrastructure with low maintenance demands and with high recycling potential after it has reached the end of its service life. For bituminous bound materials, the aging of asphalt binder has a crucial impact on durability and recyclability. Because asphalt binder is organic by nature, the thermal and oxidative aging processes affected by chemical and structural changes occur when asphalt mixes first are produced and applied and continue over the course of their service life. Increasing stiffness and brittleness of the binder make pavement more prone to thermal and fatigue cracking. The interdisciplinary research project reported here worked toward a better understanding of the physicochemical fundamentals of asphalt binder aging, as well as of the impact of binder aging on the mechanical properties of asphalt binder and asphalt mixes. Through extensive chemical and mechanical analyses, a new model was developed to explain the aging process comprehensively (i.e., on the physicochemical and mechanical levels). Aging can be determined mathematically by micromechanical modeling. With the model presented in this paper, changes in asphalt binder as a result of aging (i.e., increasing brittleness and stiffness) can be explained.

01587029

15-0705

English

0000-0002-8329-8687

pp 24–31

2015

Transportation Research Record: Journal of the Transportation Research Board

9780309369312

Print

Figures (9) ; References (28) ; Tables (2)

Aging (Materials); Asphalt mixtures; Bituminous binders; Brittleness; Mechanical properties; Physicochemical properties; Stiffness

Micromechanical models

Highways; Materials; Pavements; I31: Bituminous Binders and Materials

TRIS, TRB, ATRI

Dec 30 2014 12:20PM

• 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
• Evaluation of Oxidization of Crumb Rubber–Modified Asphalt During Short-Term Aging
• 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