01356124

Component

https://doi.org/10.3141/2207-10

http://scholar.google.com...ttle&publication_year=2011

It is well recognized that asphalt binders have the ability to self-heal or reverse microdamage during rest periods between load cycles. The ability of an asphalt mixture to self-heal depends on the physical and chemical properties of the asphalt binder, mixture properties, magnitude of damage before the rest period, and external conditions such as temperature. A thorough understanding of the healing mechanism is required to develop a comprehensive damage model that accounts for both fracture and healing on the basis of material properties and external factors such as temperature. Previous studies have hypothesized that healing was a two-step process comprising microcrack closing, referred to as crack wetting, and strength gain, referred to as intrinsic healing. Intrinsic healing or strength gain was further demonstrated to be the sum of two components: instantaneous strength gain immediately on wetting and time-dependent strength gain. A test method using the dynamic shear rheometer was developed to measure the rate of intrinsic healing, which was modeled with a modified form of the Avrami equation. The influence of temperature and aging on the rate of intrinsic healing of asphalt binders was investigated. The intrinsic healing of three asphalt binders was measured at three temperatures and two aging conditions. Results support the hypothesis that time-dependent intrinsic healing increases with an increase in temperature and that the overall capacity of the asphalt binder to heal decreases with aging of the asphalt binder.

01356126

English

pp 70-78

2011

Transportation Research Record: Journal of the Transportation Research Board

9780309167437

Print

Figures (8) ; References (20) ; Tables (2)

Aging (Materials); Bituminous binders; Temperature

Dynamic shear rheometry; Healing (Materials); Rate of strength gain

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

TRIS, TRB, ATRI

Oct 31 2011 12:50PM

• Alternate Shift Factor Relationship for Describing Temperature Dependency of Viscoelastic Behavior of Asphalt Materials
• Coarse Aggregate Angularity and Its Relationship to Permanent Deformation of Gravel-Aggregate Hot-Mix Asphalt in New York State
• Comparative Field Performance of Asphalts from Multiple Crude Oil Sources
• Correlation of Moisture Loss and Strength Gain in Chip Seals
• Direct Measurements of Volatile and Semivolatile Organic Compounds from Hot- and Warm-Mix Asphalt
• Effect of PG XX-34 on Transverse Cracking in Minnesota
• Effects of Physical Hardening on Stress Relaxation in Asphalt Cements: Implications for Pavement Performance
• Evaluation of Nano–Titanium Dioxide Additive on Asphalt Binder Aging Properties
• Modification and Validation of the Linear Amplitude Sweep Test for Binder Fatigue Specification
• New Low-Temperature Performance-Grading Method: Using 4-mm Parallel Plates on a Dynamic Shear Rheometer
• Oxidative Aging of Asphalt Binders in Hot-Mix Asphalt Mixtures
• Performance of Superpave Projects in Louisiana
• Pressure Aging Vessel and Low Temperature Properties of Asphalt Binders
• Recyclability of Polyphosphoric Acid–Modified Asphalt: Laboratory Study
• Separation of Thixotropy from Fatigue Process of Asphalt Binder