01124817

Component

https://doi.org/10.3141/2126-02

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

The fatigue endurance limit is one of the properties of hot-mix asphalt (HMA) that govern fatigue behavior of flexible pavements. Some approaches for determining the endurance limit of HMA are empirical in nature, such as the phenomenological approach. This often requires a series of tests at different strain levels and subsequent determination of the relationship between strain and number of repetitions for failure. The mechanics-based dissipated energy approach is more fundamental. However, it fails to take viscoelastic effects into account. Both approaches require considerable amounts of time and resources. This paper presents an alternative approach for determining the fatigue endurance limit of asphalt concrete by means of the elastic–viscoelastic correspondence principle, by separating the effect of viscoelasticity from that of damage development. Three different asphalt concrete mixes, replicates of the National Center for Asphalt Technology (NCAT) test track mixes, were tested for validation of the proposed methodology. Initially the cut and cored samples were tested for dynamic modulus to construct the master curves. With the data, viscoelastic properties were determined by interconversion techniques. In the next stage, fatigue tests were conducted under different strain amplitudes, starting from low to high. Then the strain data were converted to pseudostrain via the elastic–viscoelastic correspondence principle. The endurance limit was determined by identifying the strain level at which a loop between stress and pseudostrain began to develop. Endurance limit values thus determined are comparable to those obtained by flexural tests performed at NCAT. The proposed methodology can contribute to considerable savings in time and resource requirements.

01147489

09-3500

English

pp 12-18

2009

Transportation Research Record: Journal of the Transportation Research Board

9780309142564

Print

Figures (8) ; Photos (1) ; References (14) ; Tables (1)

Asphalt concrete; Fatigue limit; Fatigue tests; Flexible pavements; Hot mix asphalt; Viscoelasticity

Pseudo strain

Highways; Materials; I31: Bituminous Binders and Materials

TRIS, TRB, ATRI

Jan 30 2009 7:55PM

• 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
• Determining Intrinsic Healing Properties of Asphalt Binders: Role of Dynamic Shear Rheometer
• 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