01552725

Component

https://doi.org/10.3141/2507-11

The flow number (FN) test was recommended in NCHRP Project 9-19 as a simple performance test for rutting evaluation of asphalt mixtures. The test showed good correlation with rutting performance of mixtures from WesTrack, MnROAD, and FHWA’s accelerated loading facility. Despite this fact, no standard protocol was recommended for temperature and required stress level. Subsequent NCHRP studies allowed the development of a provisional standard. AASHTO TP 79-13 includes test parameters for stress and temperature, specimen conditioning, and minimum FN criteria that were established for hot-mix asphalt (HMA) and for warm-mix asphalt (WMA) on the basis of traffic level. In NCHRP Project 9-47A, the rutting potential of WMA mixtures was compared with that of HMA mixtures by using the FN test and the rutting criteria included in the AASHTO TP 79-13 were also evaluated. The analysis included results of samples produced by using field and lab mixtures. Thirteen mixes using 10 WMA technologies and eight corresponding HMA mixes were included. The FN test results for plant-produced WMA mixes were found to be statistically lower than those for corresponding HMA mixes in more than two-thirds of the comparisons. The study also found that the FN criteria recommended for both HMA and WMA seemed appropriate for evaluating plant-produced mixes. Another finding from the study was that FN results from lab-produced WMA mixtures were consistently lower than FN values from field mixtures; this result suggests that adjustments to the specimen conditioning requirements should be considered.

01593337

15-4870

English

pp 100–107

2015

Transportation Research Record: Journal of the Transportation Research Board

9780309369336

Print

Figures (1) ; References (15) ; Tables (10)

Asphalt mixtures; Hot mix asphalt; Laboratory tests; Plant mix; Rutting; Warm mix paving mixtures

AASHTO Provisional Standards

Flow number test

Highways; Materials; Pavements

PRP, TRIS, TRB, ATRI

Dec 30 2014 1:37PM

• Characterizing Cracking of Asphalt Mixtures with Fiber Reinforcement: Use of Cyclic Fatigue and Direct Tension Strength Tests
• Dynamic Modulus of Asphalt Mixtures: Evaluation of Effects on Pavement Performance Prediction
• Dynamic Modulus Prediction of Asphalt Concrete Mixtures Through Computational Micromechanics
• Investigating Reflective Cracking Mechanisms in Grid-Reinforced Asphalt Specimens: Use of Four-Point Bending Notched Beam Fatigue Tests and Digital Image Correlation
• Laboratory-Measured Dynamic Modulus and Predicted Performance of Asphalt Mixtures: Effects of Specimen Orientation
• Measurement of G* in Fine Asphalt Mixes: Dynamic Mechanical Analyzer Shear Test Implementation
• Prediction of Fatigue Failure at Asphalt Concrete Layer Interface from Monotonic Testing
• Prediction of Field Aging Gradient in Asphalt Pavements
• Probabilistic Modeling of Dynamic Modulus Master Curves for Hot-Mix Asphalt Mixtures
• Testing and Modeling of Fine Aggregate Matrix and Its Relationship to Asphalt Concrete Mix
• Top-Down Fatigue Cracking in High-Temperature Environments
• Understanding Sources of Variability of Overlay Test Procedure
• Use of Mechanistic Models to Investigate Fatigue Performance of Asphalt Mixtures: Effects of Asphalt Mix Design Targets and Compaction