Self-Sensing Stress-Absorption Layer with Carbon Nanotubes Grafted onto Basalt Fibers
Publication: Journal of Materials in Civil Engineering
Volume 36, Issue 2
Abstract
Fiber-reinforced emulsified asphalt (FEA) is widely used in asphalt pavement structures as a stress-absorption layer. This study aimed at developing a multifunctional fiber-reinforced emulsified asphalt (MFEA) by empowering the FEA with the self-sensing ability. To achieve this purpose, carbon nanotubes (CNTs) were grafted onto the basalt fibers in the FEA. An optical microscope and scanning electron microscope (SEM) were respectively used to investigate the distribution of CNTs onto the fibers and the microstructure of CNT/fiber composite (CFC). The fabrication process of CFC was optimized based on the distribution homogeneity of the CNTs. The self-sensing ability of the MFEA was then evaluated in the laboratory using an electrochemical workstation. Based on the experimental and analytical results, was recommended as the optimal dosage of the suspension of CNTs for grafting CNTs onto the fiber. The electrical resistance of the developed MFEA was found to be isotropic and sensitive to the demulsification state, EA/CFC mass ratio, temperature, loading speed, and deformation magnitude, which confirms the potential of using developed MFEA as a self-sensing layer to monitor its response to environmental and traffic variation. Besides, the direct tension and pull-out tests indicate the positive influence of grafting CNTs onto basalt fibers on the mechanical performance of FEA.
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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 highly appreciate the financial support from the Guangxi Key Research and Development Program (Grant No. Guike AB20159033), the Materials Engineering Chongqing Graduate Students Joint Training Base Fund (Grant No. 202103), Natural Science Foundation of Hebei Province (Grant No. E2019203559), and the China Scholarship Council (Grant No. CSC201908080046).
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Information & Authors
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Published In
Journal of Materials in Civil Engineering
Volume 36 • Issue 2 • February 2024
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Nov 29, 2022
Accepted: Jul 26, 2023
Published online: Nov 25, 2023
Published in print: Feb 1, 2024
Discussion open until: Apr 25, 2024
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