Journal of Transportation Research

Journal of Transportation Research

Evaluation of the Effect of Rheological Properties of Bitumen and Gradation of Aggregates on the Rutting Characteristics of Asphalt Mixture

Author
Azin Chitsazan
Department of Land Use Planning and Assessment, Science and Research Branch, Islamic Azad University, Tehran, Iran
10.22034/tri.2024.203806
Abstract
Rutting is one of the main sources of failure in asphalt pavements and has been widely studied because it affects safety and maintenance costs. To reduce this failure, the selection of adequate bitumen and aggregates and the proper balance between them are key elements. In this research, seven bitumen (2 base bitumen, 3 polymer-modified bitumen and 2 rubber bitumen) and asphalt mixtures with different grades (asphalt mixtures with dense grading of 19 mm and asphalt mixture with open grading of 12.5 mm) ) analyzed. The bitumens were rheologically evaluated using a dynamic shear rheometer (1DSR) and a bending beam rheometer (BBR2) to obtain high and low performance temperature 3 (PG). In addition, multiple stress creep and recovery (4MSCR) tests were performed to analyze the rutting potential of the material at different temperatures. In order to evaluate the effect of mineral skeleton on asphalt mixtures, a wheel rut test was performed. Polymer modified bitumens (5PMBs) and asphalt mixtures produced with them were the most resistant to permanent deformation with low values ​​of rut depth (2.5%). In general, open-graded mixes had better strength than dense-graded mixes. However, this comparison depends on the type of bitumen. Relationships between bitumen and mixture parameters were also proposed and they showed a good relationship between the non-recyclable creep compliance of bitumens (Jnr) and the rut depth of dense mixtures (R2 = 0.81). However, no significant relationship was found for distance-graded mixtures (R2 = 0.52).
Keywords
Bitumen
Asphalt Mixtures
Maximum Nominal Size of Aggregates
Modified Bitumen
Rutting Resistance
Wheel Rut Test
Multi-Stress Creep Test and Recovery
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