Development of Bioregenerant and Its Potential Application: Investigation for Regeneration of RAP Materials
Publication: Journal of Materials in Civil Engineering
Volume 36, Issue 9
Abstract
To achieve efficient utilization of reclaimed asphalt pavement (RAP) materials, a bioregenerant (BR) was developed in this research, and waste vegetable oil (WVO), alkylphenol polyoxyethylene ether (APEO), plasticizer [tributyl acetylcitrate (ATBC)] and tackifying resin (FTR) were chosen as components of the regenerant. The composition ratio of BR was designed based on the response surface method (RSM), and the optimal BR dosage and the regeneration effect of BR on the bioregenerated mixture (BRM) with different RAP contents were determined and investigated. Results showed that the optimal composition ratio of BR was found to be . The addition of BR significantly reduced the high-temperature stability and aging resistance of the mixture, but improved its low-temperature cracking resistance and fatigue resistance. Additionally, BR prominently contributed to the improvement for the water stability of the regenerated mixture, and its regeneration effect was found to be similar to that of two commercial regenerants, although excessive BR led to the decline of water stability. Moreover, the high-temperature stability and aging resistance of BRM when mixed with 20%, 30%, and 40% RAP were similar to those of the new asphalt mixture (NAM). At 20%, 30%, and 40% RAP content, both the low-temperature cracking resistance and fatigue resistance of BRM met the requirements. However, when the RAP content exceeded 40%, the water stability of BRM went beyond the specification limit. Taking into account the overall road performance, it is suggested that the optimal BR dosage is 5%–9%, and the maximum RAP content ensuring the road performance of BRM meets the requirements is 40%. These research findings will contribute to addressing the stacking problem of reclaimed asphalt pavement materials and environmental pollution, aligning with green and environmentally friendly sustainable development principles.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The authors gratefully acknowledge the Hubei University of Arts and Science and Chang’an University for providing all necessary conditions to come up with this work. The research has also been funded by the Fundamental Research Project of Science and Technology Department of Shanxi Province under Grant No. 202203021222428, and the economic support is gratefully acknowledged.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 36 • Issue 9 • September 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Oct 11, 2023
Accepted: Mar 1, 2024
Published online: Jun 25, 2024
Published in print: Sep 1, 2024
Discussion open until: Nov 25, 2024
ASCE Technical Topics:
- Asphalt pavements
- Construction materials
- Design (by type)
- Engineering fundamentals
- Engineering materials (by type)
- Hydration
- Infrastructure
- Laminating
- Load and resistance factor design
- Load factors
- Materials characterization
- Materials engineering
- Materials processing
- Measurement (by type)
- Mixtures
- Pavements
- Recycling
- Structural design
- Temperature effects
- Temperature measurement
- Transportation engineering
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