Experimental Investigation on the Rheological Properties and Erosion Mechanisms of Chloride Salt–Modified Asphalt Mortar
Publication: Journal of Materials in Civil Engineering
Volume 36, Issue 2
Abstract
The direct action of salt on asphalt materials has received limited research despite the abundance of studies on salt erosion and its effects on the moisture stability of asphalt concrete. This study aimed to investigate the effects of chloride salt on the rheology of asphalt and erosion mechanisms. Microscopic properties of asphalt mortar were analyzed through scanning electron microscope (SEM) and Fourier transform infrared spectroscopy (FTIR), and the erosion degree of salt in asphalt mortar was evaluated based on three major indexes. Rheological properties of asphalt mortar were determined through temperature sweep and multiple stress creep and recovery (MSCR) tests, while the modified water-boiling test was conducted to evaluate the adhesion of asphalt mortar. Results showed that as salinity increases, the agglomerate phenomenon tends to occur in asphalt mortar, leading to physical aging effects on its basic properties. Meanwhile, chloride salt modified asphalt concrete is prone to cracking at low temperatures and has reduced durability at high temperatures, making it unsuitable for standard load or heavy traffic pavement requirements of PG64 modified asphalt. Furthermore, the presence of chloride in asphalt mortar was not conducive to its adhesion.
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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 wish to thank the State Key Laboratory of Silicate Materials for Architectures and the Center for Materials Research and Analysis of Wuhan University of Technology for providing experimental equipment. Meanwhile, thanks for Linjie Zhu from Keyango (www.sci-go.com) for the SEM analysis.
Author contributions: Qi Jiang: writing-original draft preparation and writing-reviewing and editing. Wei Liu: visualization and supervision. Shaopeng Wu: project administration, visualization and supervision, and funding acquisition.
Disclaimer
This paper is based on work supported by the Hubei Provincial Technology Innovation Special Project (2014DLA129). Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the authors and do not necessarily reflect the views of the State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology.
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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: Apr 28, 2023
Accepted: Jul 13, 2023
Published online: Nov 20, 2023
Published in print: Feb 1, 2024
Discussion open until: Apr 20, 2024
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