01475999

Component

https://doi.org/10.3141/2370-13

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

Because of the widespread use of modifiers and additives in asphalt bitumen, this study revisits and evaluates the adaptation of the time–temperature superposition principle that is incorporated into the low-temperature Superpave® binder specifications. The study builds on results of bending beam rheometer (BBR) tests conducted on samples of asphalt binders used in seven different surface layer mixtures. Both 240-s and 2-h BBR tests were conducted at three different temperatures: the low temperature of the asphalt performance grade (TL), 10°C higher than the low-temperature grade (TL+10), and at –5°C to construct the flexural creep stiffness master curves. Additionally, indirect tensile tests were conducted on the surface layer mixtures to determine the low-temperature properties. The BBR test results show that the methodology adopted in using the equivalence principle to formulate the low-temperature Superpave binder specifications does not accurately apply for some of the binders used in this study. Thus, modifications to the specifications for loading times and test temperatures are suggested. Further, the time–temperature shift factors for the binders evaluated are compared with the universal shift factors used in the SHRP study. The observed mismatch in the shift factor sets is in disagreement with the implicit assumption that all asphalt binders can be characterized by similar shift factors at low temperatures. The shift factors of the binders and mixtures used in this study tend to match well, particularly at high testing temperatures.

01500280

13-4529

English

pp 102–108

2013

Transportation Research Record: Journal of the Transportation Research Board

9780309286886

Print

Figures (7) ; References (13) ; Tables (4)

Asphalt mixtures; Bending stress; Bituminous binders; Cracking; Creep properties; Low temperature; Properties of materials; Rheometers; Stiffness; Superpave

Bending beam tests

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

TRIS, TRB, ATRI

Feb 5 2013 12:52PM

• Analysis of Five-Point Bending Test for Multilayer Surfacing System on Orthotropic Steel Bridges
• Critical Problems with Using the Asphalt Ductility Test as a Performance Index for Modified Binders
• Effect of Crumb Rubber Modifier Dissolution on Storage Stability of Crumb Rubber–Modified Asphalt
• Effectiveness of Antistrip Agents in Asphalt Mixtures
• Evaluation of Rejuvenator’s Effectiveness with Conventional Mix Testing for 100% Reclaimed Asphalt Pavement Mixtures
• Evolution of the Crossover Modulus with Oxidative Aging: Method to Estimate Change in Viscoelastic Properties of Asphalt Binder with Time and Depth on the Road
• Experimental Evaluation of Shear Resistance of Improved Steel–Asphalt Interfaces
• First Observation of Blending-Zone Morphology at Interface of Reclaimed Asphalt Binder and Virgin Bitumen
• Linear and Nonlinear Viscoelastic Analysis of Bituminous Mortar
• Low-Temperature Oxidation Kinetics of Asphalt Binders
• Mechanism of Crumb Rubber Modifier Dissolution into Asphalt Matrix and Its Effect on Final Physical Properties of Crumb Rubber–Modified Binder
• Quality and Durability of Warm Rubberized Asphalt Cement in Ontario, Canada
• Recovery and Laboratory Testing of Asphalt Emulsion Residue: Application of Simple Aging Test and 4-mm Dynamic Shear Rheometer Test
• Recycled Asphalt Shingle Binder Characterization and Blending with Virgin Binders
• Revision and Further Validation of Surface Performance-Graded Specification for Chip Seal Binders
• Significance of Mixture Parameters on Binder Aging in Hot-Mix Asphalt Mixtures
• Simplification of Linear Amplitude Sweep Test and Specification Parameter