Abstract
The overall objectives of this study were to determine the most appropriate additive for improving the physical properties and the medium- and high-temperature performances (mechanical performance) of asphalt binders. Three different types of modified binders were prepared: crumb rubber modifier (CRM), polypropylene (PP), and tafpack super (TPS), which had concentrations of 2%, 3%, 3.5%, and 4% by weight of asphalt binder, for each modifier. Their physical and rheological properties were evaluated by applying various tests such as ductility, rotational viscosity, toughness, and tenacity, as well as the dynamic shear rheometer (DSR) test. As a result, the physical properties of the modified bitumen binders were compared, as were the medium- and high-temperature performances (mechanical performance), which had temperatures of 58, 64, 70, 76, 82, and 88 °C, respectively. This was how the most appropriate modifier was determined. The results demonstrated that the asphalt binder properties significantly improved by utilizing CRM followed by PP and TPS modifiers. The increase in the rutting parameter (G*/sin(δ)) after asphalt modification indicated its excellent performance at both medium- and high-temperatures. Lastly, the CRM was determined as the most preferred additive because of its positive effect on the physical properties and enhancement of the medium- and high-temperature performance (mechanical performance).
Highlights
Asphalt is a smooth material consisting of more than a thousand chemical types and has vital significance for the transportation infrastructure [1]
The results showed that the crumb rubber modifier (CRM) contents have to be higher than that of the SBS to obtain the same performance
The objectives of this study were for the laboratory experiments to evaluate the physical properties and mechanical performance of the modified asphalt binders using CRM, tafpack super (TPS), and PP modifiers
Summary
Asphalt is a smooth material consisting of more than a thousand chemical types and has vital significance for the transportation infrastructure [1]. Asphalt is used extensively as a binding in flexible pavement construction worldwide due to its excellent viscoelastic properties and superior service performance [2,3]. Due to asphalt’s temperature sensitivity, it changes in climatic conditions, reducing the quality of asphalt pavement, which causes different distresses, such as rutting at high temperatures and cracking at low temperatures [4]. When asphalt pavement is exposed to heavy traffic loads, its quality is considerably reduced [5]. The suitable modification of the asphalt binder must be perfect for promoting safe, reliable, and environment-friendly flexible pavement materials [6]. The physical properties and medium- and high-temperature performances (mechanical performance) can be enhanced by using asphalt modifiers [7,8]. Crumb rubber modifier (CRM), tafpack super (TPS), and polypropylene (PP) have attracted enormous attention in the field of asphalt pavements [9,10]
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