01478743

Component

https://doi.org/10.3141/2373-14

http://scholar.google.com...seni&publication_year=2013

Currently, flow number (FN) is being used for measuring the permanent deformation resistance of asphalt mixtures. The provisional AASHTO TP 79 test method specifies the requirements of the FN test; however, there are undefined levels of test variables, such as temperature, axial stress, and confinement. Agreeable FN criteria that can reliably discriminate between various mixtures have not been established. As the asphalt industry continues to develop more sophisticated mixtures (warm mix, reclaimed asphalt pavement, and reclaimed asphalt shingles), the FN value has failed to capture the true complexity of the asphalt mixtures. These shortcomings and the unpredictable testing time of the FN test have affected its usefulness for evaluating high-temperature performance of asphalt mixtures. A new test procedure for evaluation of the rutting susceptibility of asphalt mixtures is being proposed. The new procedure is conducted at one temperature and three stresses on the same replicate in three increments of 500 cycles and takes only 25 min to complete. The property of the test is the permanent strain attributable to the last cycle of each test increment (minimum strain rate, MSR). A master curve is developed by plotting the MSR values versus parameter TP, which is a product of temperature and pressure. The MSR master curve represents the unit rutting damage (rut per axle) of asphalt mixtures at any stress and temperature and can be used in the laboratory for material characterization, mix design verification, mixture ranking, or pavement design applications to predict rut depth for project climate and design traffic.

01517321

13-5160

English

pp 134–142

2013

Transportation Research Record: Journal of the Transportation Research Board

9780309287081

Print

Figures (3) ; References (19) ; Tables (7)

Asphalt mixtures; Deformation; Mix design; Repeated loads; Rutting; Temperature

Flow number test

Highways; Materials; Pavements; I30: Materials

TRIS, TRB, ATRI

Feb 5 2013 12:59PM

• Approach for Quantifying the Effect of Binder Oxidative Aging on the Viscoelastic Properties of Asphalt Mixtures
• Comparison of Uniaxial and Four-Point Bending Fatigue Tests for Asphalt Mixtures
• Constitutive Modeling of Cyclic Viscoplastic Response of Asphalt Concrete
• Constitutive Modeling of Fatigue Damage Response of Asphalt Concrete Materials
• Development of Calibration Testing Protocol for Permanent Deformation Model of Asphalt Concrete (With Discussion and Closure)
• Laboratory Hot-Mix Asphalt Cracking Testing: Evaluation of Three Repeated Loading Crack Tests
• Laboratory Validation of Healing-Based Fatigue Endurance Limit for Hot-Mix Asphalt
• Local Practice of Assessing Dynamic Modulus Properties for Washington State Mixtures
• Mechanistic-Based Approach to Evaluate Rutting Susceptibility of Hot-Mix Asphalt Mixtures by Use of Dynamic Triaxial Testing
• Modeling Water Vapor Diffusion in Pavement and Its Influence on Fatigue Crack Growth of Fine Aggregate Mixture
• Modified Paris’s Law to Predict Entire Crack Growth in Asphalt Mixtures
• Nonlinear Viscoelastic Behavior of Asphalt Concrete and Its Implication for Fatigue Modeling
• Three-Dimensional Microstructural Modeling of Asphalt Concrete by Use of X-Ray Computed Tomography