01333215

Component

https://doi.org/10.3141/2207-13

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

Current asphalt binder specifications lack the ability to characterize asphalt binder damage resistance to fatigue loading. Multiple accelerated testing procedures that attempt to efficiently and accurately characterize the contribution of asphalt binders to mixture fatigue are under investigation. One of these tests, which has received significant acceptance by experts and has been submitted as a draft AASHTO standard, is the linear amplitude sweep (LAS) test. This procedure uses viscoelastic continuum damage mechanics to predict binder fatigue life as a function of strain in the pavement. The LAS test uses cyclic loading with systematically increasing load amplitudes to accelerate damage and provides sufficient data for analysis in less than 30 min. Although results of the current LAS testing protocol are promising, the time and the complex numerical procedures required for the analysis have raised concern. In addition, insufficient damage accumulation was observed when the strain amplitudes proposed in the LAS test were used for a set of polymer-modified binders. This paper presents simplifications of the current analysis procedures and evaluates the ability of extended strain levels to cause sufficient damage for better calculation of the binder fatigue law parameters. The effectiveness of the modified procedure was validated by comparison of the results with the fatigue performance recorded by the Long-Term Pavement Performance program with consideration of the pavement structure. The fair correlations showed the potential for effective use of the modified method for binder specifications.

01356126

11-3437

English

pp 99-106

2011

Transportation Research Record: Journal of the Transportation Research Board

9780309167437

Print

Figures (9) ; References (12) ; Tables (4)

Accelerated tests; Asphalt mixtures; Bituminous binders; Fatigue (Mechanics); Repeated loads; Specifications; Strain (Mechanics); Test procedures

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

TRIS, TRB

Feb 17 2011 6:31PM

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• 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
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• 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