Effects of Different Nanofibers on Self-Healing Properties of Composite Modified Emulsified Asphalt
Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 7
Abstract
To improve the self-healing performance of styrene-butadiene-styrene/multiwalled carbon nanotube composite modified emulsified asphalt (SMEA), three representative types of nanofibers were used to reinforce SMEA, and their effects on self-healing properties of SMEA were discussed by the developed self-healing evaluation methods. Test results indicate that basalt (BS) nanofiber without shape memory performance not only decreases the ductility and low-temperature cracking resistance of evaporation residue of SMEA after self-healing but also lowers the self-healing performance of SMEA. On the contrary, polyethylene terephthalate (PET) nanofiber and polytrimethylene terephthalate (PTT) nanofiber improve the ductility and low-temperature cracking resistance of SMEA. Further, PTT nanofiber with a stronger shape memory property more obviously increases the self-healing performance of SMEA than PET nanofiber. Additionally, the self-healing index of dissipated energy ratio () before and after self-healing is more suitable to characterize the self-healing performance of nanofiber-reinforced SMEA. Finally, PTT nanofiber-reinforced SMEA shows satisfactory repeated self-healing performance. PTT nanofiber at the content of 0.35% is proposed to reinforce SMEA, developing more durable modified emulsified asphalt for the maintenance and repair of asphalt pavement.
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Data Availability Statement
No data, models, or code were generated or used during the study.
Acknowledgments
This work was supported by the National Natural Science Foundation of China (No. 51978340), Provincial Six Talent Peaks Project in Jiangsu (No. JNHB-050), and Jiangsu Provincial Department of Education for the Qing Lan Project. Also, we would like to thank the Advanced Analysis & Testing Center of Nanjing Forestry University for the assistance in experiments.
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© 2021 American Society of Civil Engineers.
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Received: Oct 12, 2020
Accepted: Dec 14, 2020
Published online: Apr 21, 2021
Published in print: Jul 1, 2021
Discussion open until: Sep 21, 2021
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