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Aging Characteristics of Bitumen from Different Bituminous Pavement Structures in Service
Xiaofeng Wang1,2, Haoyan Guo3, Bo Yang4,5
1Research and Development Center of Transport Industry of Technologies, Materials and Equipments of Highway Construction and Maintenance, Zhengzhou 450052, China. wangxf0351@sina.com.
Materials (Basel, Switzerland)
|February 13, 2019
Summary
Bitumen aging in pavements is most severe in the upper layers due to oxygen absorption, leading to harder bitumen and altered molecular structures. This necessitates timely measures to mitigate early aging in top pavement layers.
Area of Science:
- Materials Science
- Civil Engineering
- Chemical Engineering
Background:
- Bitumen aging significantly impacts the longevity of bituminous pavements.
- Existing research often overlooks real-world aging conditions, limiting applicability to in-service pavements.
Purpose of the Study:
- To investigate the comprehensive aging process and mechanism of in-service bitumen.
- To analyze bitumen aging in different pavement structures (bridge deck, traffic lane, ramp).
Main Methods:
- Core samples from various pavement layers were analyzed.
- Techniques included gel permeation chromatography (GPC), Fourier transform infrared spectroscopy (FTIR), dynamic shear rheometer (DSR), and fluorescence microscopy (FM).
Main Results:
- Bitumen aging was most severe in the upper pavement layers and weakest in the bottom layers.
- Oxygen absorption was identified as the primary aging mechanism.
- Aging resulted in harder bitumen with altered viscoelastic properties and molecular weight changes.
- Styrene-butadiene-styrene (SBS) modifiers in aged bitumen became granular and appeared as a single phase.
Conclusions:
- The aging degree of bitumen varies significantly across different layers within bituminous pavement structures.
- Upper pavement layers experience the most substantial bitumen aging.
- Proactive measures are crucial to reduce premature aging in the upper layers of bituminous pavements.
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