01553739

Component

https://doi.org/10.3141/2507-05

This study characterized the mechanical properties in fine asphalt mixtures by means of a microscale test. The method involved the design of the fine asphalt matrix, the specimen preparation, the performance of shear tests, and the construction of complex shear modulus master curves based on the obtained results. The tests were performed with a device called a dynamic mechanical analyzer (DMA). The test configuration consisted of a temperature and frequency sweep for a given strain level, within the linear viscoelastic range of the material. The test implementation experimental design involved the use of two aggregate sources and three asphalt types (neat, styrene–butadiene rubber modified, and ethylene copolymer modified). On the basis of the results for the mixes, master curves were calibrated by sigmoidal, Christensen–Anderson, and Christensen–Anderson–Marasteanu general models and using Arrhenius and William–Landel–Ferry shift factors. As part of the study, the DMA test based on shear loading mode was successfully implemented and allowed for measurement of a fundamental material property: complex shear modulus (G*). The G* estimation involved measurement of shear stress, strain, and phase angles. Complex shear moduli in the range of 40 to 170 MPa were obtained; the fine asphalt mixtures modified with ethylene block copolymer developed higher stiffness, and the ones with neat binder had lower stiffness. From the G* results, master curves were developed. A higher fit was obtained when the general sigmoidal formula was used; this result indicated the high degree of similitude in behavior between the fine asphalt matrix and the complete hot-mix asphalt mixtures.

01593337

15-3183

English

pp 39–49

2015

Transportation Research Record: Journal of the Transportation Research Board

9780309369336

Print

Figures (9) ; Photos; References (12) ; Tables (2)

Asphalt mixtures; Mechanical properties; Shear modulus; Shear tests; Stiffness

Complex shear modulus; Dynamic mechanical analyzer; Master curves; Micromechanical behavior

Highways; Materials; Pavements

TRIS, TRB, ATRI

Dec 30 2014 1:04PM

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• Flow Number Test and Assessment of AASHTO TP 79-13 Rutting Criteria: Comparison of Rutting Performance of Hot-Mix and Warm-Mix Asphalt Mixtures
• 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
• 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