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Comparative Study of Thermal-Oxidative Aging and Salt Solution Aging on Bitumen Performance
1Department of Civil and Environmental Engineering, Norwegian University of Science and Technology, Høgskoleringen 7A, 7491 Trondheim, Norway.
Materials (Basel, Switzerland)
|April 3, 2021
Summary
This study compares thermal-oxidative and salt solution aging effects on bitumen. Both aging methods similarly impact bitumen properties, but salt solution aging causes distinct morphological changes, with PAV aging being the most severe.
Area of Science:
- Materials Science
- Civil Engineering
- Chemical Engineering
Background:
- Bitumen aging negatively impacts asphalt pavement durability and lifespan.
- Bitumen aging is attributed to thermal oxidation and solution immersion.
- Understanding different aging mechanisms is crucial for pavement performance.
Purpose of the Study:
- To compare the effects of thermal-oxidative aging and salt solution aging on bitumen performance.
- To evaluate how different aging methods influence bitumen's physical, chemical, and mechanical properties.
- To establish a comparative aging degree for various aging techniques.
Main Methods:
- Thermal-oxidative aging: Thin Film Oven Test (TFOT) and Pressure Aging Vessel (PAV).
- Salt solution aging: 10% NaCl and 10% CaCl2 solutions.
- Analysis techniques: SEM-EDS for morphology and oxygen content, physical tests, Bending Beam Rheometer (BBR), and Dynamic Shear Rheometer (DSR).
Main Results:
- Both aging types showed similar trends in oxygen content, physical, low-temperature, and high-temperature properties.
- Morphological changes in bitumen differed between thermal-oxidative and salt solution aging.
- Aging severity order: PAV > 10% NaCl > TFOT > 10% CaCl2.
Conclusions:
- Salt solution aging significantly affects bitumen properties, comparable to thermal-oxidative aging.
- Distinct morphological alterations are observed under salt solution aging.
- Findings provide a basis for standardizing bitumen solution aging protocols.
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