01124286

Component

https://doi.org/10.3141/2126-06

http://scholar.google.com...ttle&publication_year=2009

A self-healing material has the inherent ability to partially reverse damage. There is consensus that the healing of damage has a substantial effect on the performance of asphalt pavements. It is important to understand the mechanisms responsible for healing in asphalt binders, to develop a model to predict healing on the basis of these mechanisms, and to develop test methods to determine the properties required for use with such a model. A healing model for asphalt materials comprises a convolution of wetting and intrinsic healing processes that occur across a crack interface. According to the proposed convolution process, intrinsic healing or strength gain across a crack surface occurs in two steps: an instantaneous strength gain resulting from the interfacial cohesion between the crack faces, and a time-dependent strength gain resulting from intermolecular diffusion and randomization across the crack interface. A modified form of the Avrami equation, which includes a parameter for instantaneous strength gain, is used to describe the intrinsic healing in asphalt binders. A test method is described that is based on the use of a dynamic shear rheometer for estimating the parameters of the intrinsic healing function. Five asphalt binders with considerably different compositions were studied. Limited validation of this test method and the intrinsic healing model are presented by comparing the parameter related to instantaneous healing with the thermodynamic work of cohesion for the selected binders.

01147489

09-2093

English

pp 47-54

2009

Transportation Research Record: Journal of the Transportation Research Board

9780309142564

Print

Figures (6) ; Photos (3) ; References (12) ; Tables (1)

Asphalt pavements; Bituminous binders; Bituminous materials; Cohesion; Cracking; Equations; Mathematical models; Rheometers

Damage (Pavements); Healing (Materials); Self healing cracks

Highways; Materials; Pavements; I23: Properties of Road Surfaces; I31: Bituminous Binders and Materials

TRIS, TRB, ATRI

Jan 30 2009 6:25PM

• Application of Elastic–Viscoelastic Correspondence Principle to Determine Fatigue Endurance Limit of Hot-Mix Asphalt
• Asphalt Cement Loss Tangent as Surrogate Performance Indicator for Control of Thermal Cracking
• Characterizing Fatigue of Asphalt Binders with Viscoelastic Continuum Damage Mechanics
• Comparison of Asphalt Rubber and Conventional Mixture Properties: Considerations for Mechanistic–Empirical Pavement Design Guide Implementation
• Effect of Crumb Rubber Bituminous Mixes on Functional Characteristics of Road Pavements
• Effects of Warm-Mix Asphalt Additives on Workability and Mechanical Properties of Reclaimed Asphalt Pavement Material
• Evaluation of Bond Strength of Tack Coat Materials in Field: Development of Pull-Off Test Device and Methodology
• Evaluation of Warm-Mix Asphalt Produced with the Double Barrel Green Process
• Field and Laboratory Forensic Analysis of Reflective Cracking on Massachusetts Interstate 495
• Investigation of Fiber-Modified Bituminous Mixes
• Laboratory and Field Evaluations of Foamed Warm-Mix Asphalt Projects
• Laboratory Investigation of Moisture Damage in Warm-Mix Asphalt Containing Moist Aggregate
• Modeling of Repeated Creep and Recovery Experiments in Asphalt Binders
• Performance of Polymer-Modified Asphalt Mixture with Reclaimed Asphalt Pavement
• Practical Use of Multiple Stress Creep and Recovery Test: Characterization of Styrene–Butadiene–Styrene Dispersion and Other Additives in Polymer-Modified Asphalt Binders
• Testing of Moderate and High Reclaimed Asphalt Pavement Content Mixes: Laboratory and Accelerated Field Performance Testing at the National Center for Asphalt Technology Test Track
• Virginia’s Higher Specification for Reclaimed Asphalt Pavement: Performance and Economic Evaluation