A Sustainable Reinforcement Method for Recycled Road Subgrade Demolition Waste as Road Bases Using Waterborne Polyurethane and Fiber
Publication: International Journal of Geomechanics
Volume 24, Issue 8
Abstract
The discard of recycled road demolition waste (RDW) leads to natural resource waste and environmental problems. The RDW is reused as road base, which is a sustainable application and promising construction technology with good environmental benefits and economic value. The performance of road base with RDW depends on the compressive strength, splitting strength, and ductility. However, owing to the poor mechanical properties, the RDW can only be reused after being treated. The traditional treatment method of waste as road base is to enhance mechanical performance using cement. However, when cement is used as a stabilizer, the road base cracks very easily, thereby damaging the pavement. Therefore, in this article, a new reutilization method of RDW as road base is proposed. The waterborne polyurethane (PU) was proposed to improve the strength of RDW, and basalt fiber (BF), polypropylene fiber (PF), and carbon fiber (CF) were used to improve the ductility of PU-stabilized RDW. The related mechanical behavior was investigated by unconfined compressive strength and splitting strength tests. Meanwhile, the mechanism of RDW enhanced by PU and PU + CF/PF/BF was revealed using scanning electron microscope (SEM), X-ray diffraction (XRD), and Fourier transform infrared reflection (FTIR) tests. The results showed that the PU could improve the strength of RDW. When BF, PF, and CF were added, the compressive strength, residual strength, splitting strength, failure strain, and ductility were further enhanced. When the fiber content was 6%, a maximum compressive strength was obtained, and the PF had the best improvement effect on the mechanical properties of PU-stabilized RDW. When the PF content was 0.6% and 0.8%, the 7-days compressive strength could meet the class II standard (3.0 MPa) of road subbase for heavy traffic expressways. The failure strain increased with the compressive strength increasing. The mechanical performance improvement effect of PU and PU + CF/PF/BF on RDW came from the bonding effect of PU, and the bridging effect and reinforcement effect of fiber. This study provides a favorable way for the recycling of RDW, which is conducive to the sustainable development of environment and the conservation and utilization of energy.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This research was supported by the National Natural Science Foundation of China (Grant No. 52179107), China Scholarship Council (No. 201607910002), and international scientific and technological cooperation projects of Shaoxing University (Project No. 2019LGGH1007).
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Published In
International Journal of Geomechanics
Volume 24 • Issue 8 • August 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Nov 7, 2022
Accepted: Mar 4, 2024
Published online: Jun 13, 2024
Published in print: Aug 1, 2024
Discussion open until: Nov 13, 2024
ASCE Technical Topics:
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- Business management
- Compressive strength
- Construction wastes
- Ductility
- Engineering materials (by type)
- Environmental engineering
- Fabrics
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- Material properties
- Materials engineering
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- Practice and Profession
- Recycling
- Solid wastes
- Strength of materials
- Sustainable development
- Transportation engineering
- Wastes
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