Journal of Transportation Research

Journal of Transportation Research

Investigating the Effect of Cellulose Fibers Coated with Sasobit on the Rheological Behavior of Rubber Powder Bitumen

Document Type : Original Article

Authors
Behrooz Shirgir 1
Mohammadreza Karimi 2
Mohsen Fallah Zavareh 3
1 Assistant Professor, Department of Civil Engineering, Kharazmi University, Tehran, Iran.
2 M.Sc., Grad., Department of Civil Engineering, Kharazmi University, Tehran, Iran.
3 Associate Professor, Department of Civil Engineering, Kharazmi University, Tehran, Iran.
10.22034/tri.2024.401385.3164
Abstract
It is very common to modify rubber bitumen with warm asphalt waxes such as Sasobit, also the use of cellulose fibers for tensile strength and better strain energy absorption power than other additives has attracted the attention of researchers. This research used cellulose fibers coated with Fishertraps wax (Sasobit) in proportions of 1,3, and 5% as an additive in bitumen with 15% rubber powder. So that modified bitumen can be used to improve strain energy absorption and bitumen shedding in asphalt mixtures with open-graded and low density or to improve the index of resistance against rutting in higher-density mixtures. The results of the investigation of rheological properties indicate that the addition of the mentioned fibers to rubber bitumen, in addition to reducing stiffness, increases its resistance to rutting in both unaged and short-term aged samples. The results show that the upper-performance limit of unaged pure bitumen 22-64, with the presence of 15% rubber powder and improved fibers, for example, adding 5% fibers to bitumen with 15% rubber powder increases the upper limit of bitumen performance up to 94 degrees Celsius. It increases the degree. Also, the performance of short-term aged and non-aged rubber bitumen is similar, but short-term aging of bitumen reduces the effect of fibers. Also, the addition of fibers causes an increase in the modulus of complexity in the middle temperature and better performance in returning from the multi-stress level in the fracture temperature. This better performance makes the rubber powder bitumen-containing fibers perform better against rutting failure at the highest operating temperature.
Keywords
Rubber Powder Asphalt
Cellulose Fibers
Sasobit
Rheological Behavior
Returning from the ulti-stress Level
Subjects
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