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Effects of the Mixing Process on the Rheological Properties of Waste PET-Modified Bitumen
Grzegorz Mazurek1, Przemysław Buczyński1, Marek Iwański1
1Department of Civil Engineering and Architecture, Kielce University of Technology, Al. Tysiąclecia Państwa Polskiego 7, 25-314 Kielce, Poland.
Materials (Basel, Switzerland)
|December 9, 2023
Summary
This study shows PET modification significantly reduces bitumen's creep susceptibility, enhancing its performance for high-traffic roads. Low-temperature properties are important but secondary to improved high-temperature performance.
Area of Science:
- Materials Science
- Civil Engineering
- Polymer Chemistry
Background:
- Bitumen modification is crucial for improving pavement performance.
- Polyethylene terephthalate (PET) is explored as a modifier for bitumen.
- Understanding the impact of PET on bitumen's properties is essential for road construction.
Purpose of the Study:
- To analyze the effects of PET modification on bitumen's rheological and low-temperature properties.
- To identify key factors influencing the bitumen-PET mixing process and final composite characteristics.
- To develop predictive models for modified bitumen performance.
Main Methods:
- D-optimal experimental design with factorial analysis.
- Rheological testing (MSCR, G*/sin(δ)) at various temperatures.
- Low-temperature evaluation using the BBR test.
Main Results:
- PET modification primarily reduced bitumen's creep susceptibility (MSCR).
- Mixing parameters (PET amount, rate, temperature) significantly influenced stiffness.
- Bitumen type and amount impacted low-temperature properties (BBR).
Conclusions:
- PET modification enhances bitumen suitability for high-traffic roads by reducing susceptibility.
- Optimizing mixing parameters is critical for achieving homogeneous and high-performing modified bitumen.
- Predictive models (GLM) aid in understanding and optimizing PET-modified bitumen composition.
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