Enhanced Pavement Performance and Improved Stability of Asphalt and Recycled Plastic Blends Modified by Exfoliated Clay Nanoplatelets
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Volume 34, Issue 5
Abstract
The inclusion of recycled plastics into hot-mix asphalt is highly desirable for improved pavement performance. In this study, the need for enhanced compatibility between the components and increased mechanical performance of asphalt (AS) and polyethylene (PE) blends was addressed through the use of dispersed/exfoliated nanoclays (NC). Fourier-transform infrared (FTIR) spectroscopy showed evidence of new chemical interactions of the dispersed NC-d within the AS/PE matrix, suggesting a better-blended phase morphology. The layered silicate plate-like morphology of dispersed/exfoliated NC, identified by scanning electron microscopy, SEM, observations, promotes a greater adhesion between asphalt and polyethylene, leading to significant enhancements in all mechanical properties of viscoelastic AS/PE/NC-d blend. Indirect tensile (IDT) strength, uniaxial compression, and compression fatigue tests were performed on AS/PE blends modified by “as received” and dispersed/exfoliated NCs. The effective modification of the AS/PE blend with the dispersed/exfoliated NC-d is demonstrated by a significant improvement in IDT strength (40%), cracking tolerance index (26%), failure energy (22%), compressive strength (42%), and dynamic modulus (44%).
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
Partial financial support of this research has been provided by the Federal Highway Administration (FHWA) Dwight David Eisenhower Transportation Fellowship Program. The authors would like to thank Texas Materials Group (TexasBit) Inc. for providing the AS. Finally, we would like to thank Myrsini Maglogianni and Michail Margas, graduate students at the Center for Advanced Construction Materials of The University of Texas at Arlington, for their help in FTIR and SEM tests.
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Published In
Journal of Materials in Civil Engineering
Volume 34 • Issue 5 • May 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Jun 22, 2021
Accepted: Sep 27, 2021
Published online: Mar 2, 2022
Published in print: May 1, 2022
Discussion open until: Aug 2, 2022
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Cited by
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