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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 40241 (09)
- University: Sharif University of Technology
- Department: Civil Engineering
- Advisor(s): Tabatabaee, Nader
- Abstract:
- Rutting is a primary cause of premature deterioration of asphalt pavements and modifying asphalt binders is a common way to improve binder characteristics and field performance. Two types of parameters are used to characterize asphalt rutting. One type includes binder parameters such as zero-shear viscosity and the Superpave rutting resistance index (G*/sinδ) derived from oscillatory loading tests such as the dynamic shear rheometer. The other type is derived from static and repeated loading creep tests on mixtures and binders. Researchers have pointed out that these parameters can rank modified binder and mixture rut susceptibility differently. In this study the rutting resistance of mixtures made with two unmodified binders, three mixed aged binders, and eight modified binders including low and high percentages of styrene-butadiene-styrene, ethylene-vinyl-acetate, crumb rubber and poly-phosphoric acid was evaluated. Asphalt binder properties were determined according to Superpave specifications. Asphalt concrete specimens were then fabricated for each binder and the rut susceptibility of the mixtures was evaluated by conducting unconfined static and repeated loading creep tests. The results were used to present a comprehensive ranking of rutting resistance of mixes with a wide range of modifiers and also evaluate the suitability of Superpave rutting resistance index (G*/sinδ) in predicting the rut susceptibility of modified binders by correlating the results of the two types of parameters.
- Keywords:
- Modified Bitumen ; Asphalt Mixture ; Superpave Method ; Rutting
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